/* ========================================
   NIRO Lab - Main Stylesheet
   Clean Academic Design
   ======================================== */

/* CSS Custom Properties */
:root {
  /* Colors */
  --color-primary: #1a365d;
  --color-primary-light: #2c5282;
  --color-primary-dark: #0f2440;
  --color-accent: #0d9488;
  --color-accent-light: #14b8a6;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-background: #ffffff;
  --color-background-alt: #f8fafc;
  --color-border: #e5e7eb;
  --color-success: #10b981;
  --color-warning: #f59e0b;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Merriweather', Georgia, serif;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;

  /* Effects */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
}

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

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

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

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-primary-dark);
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: var(--spacing-md);
}

/* Tables */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin-bottom: var(--spacing-xl);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

th, td {
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background: var(--color-primary-dark);
  color: #fff;
  font-weight: 600;
}

tr:last-child td {
  border-bottom: none;
}

tr:nth-child(even) {
  background: var(--color-background-alt);
}

td:first-child {
  font-weight: 500;
  white-space: nowrap;
}

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

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

.main-content {
  min-height: calc(100vh - 160px);
}

/* ========================================
   Header
   ======================================== */
.site-header {
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  gap: var(--spacing-xl);
}

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo:hover {
  color: var(--color-primary);
}

.logo-img {
  height: 60px;
  width: auto;
}

.logo-text {
  color: var(--color-primary-dark);
}

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  margin: 0;
  padding: 0;
}

.nav-link {
  font-weight: 500;
  color: var(--color-text);
  padding: var(--spacing-sm) 0;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link.active {
  color: var(--color-primary);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  left: 0;
  transition: transform var(--transition);
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

.menu-toggle.is-active .hamburger {
  background: transparent;
}

.menu-toggle.is-active .hamburger::before {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.is-active .hamburger::after {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  background: var(--color-primary-dark);
  color: #fff;
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  margin-top: var(--spacing-3xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-2xl);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.footer-logo img {
  height: 80px;
  filter: brightness(0) invert(1);
}

.footer-description {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 0;
}

.footer-links h4,
.footer-contact h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a,
.footer-contact a {
  color: rgba(255, 255, 255, 0.8);
}

.footer-links a:hover,
.footer-contact a:hover {
  color: var(--color-accent-light);
}

.footer-contact p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-sm);
}

.footer-bottom {
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.hero h1 {
  color: #fff;
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.hero-subtitle {
  font-size: 1.25rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

/* ========================================
   Section Styles
   ======================================== */
.section {
  padding: var(--spacing-3xl) 0;
}

.section-alt {
  background: var(--color-background-alt);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title h2 {
  display: inline-block;
  position: relative;
}

.section-title h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  margin: var(--spacing-md) auto 0;
}

/* ========================================
   Cards
   ======================================== */
.card {
  background: var(--color-background);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-image {
  aspect-ratio: 16/10;
  overflow: hidden;
  background: var(--color-background-alt);
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-content {
  padding: var(--spacing-lg);
}

.card-title {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
}

.card-text {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  margin-bottom: var(--spacing-md);
}

/* ========================================
   People Grid
   ======================================== */
.people-section {
  margin-bottom: var(--spacing-3xl);
}

.people-section:last-child {
  margin-bottom: 0;
}

.people-section h3 {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-border);
}

.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.person-card {
  text-align: center;
}

.person-image {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto var(--spacing-md);
  background: var(--color-background-alt);
  border: 4px solid var(--color-border);
}

.person-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.placeholder-image {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-background-alt);
}

.person-name {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xs);
}

.person-role {
  color: var(--color-text-light);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

.person-email {
  font-size: 0.875rem;
}

/* Person Detail Page */
.person-detail {
  padding: var(--spacing-3xl) 0;
}

.person-header {
  display: flex;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.person-image-large {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--color-background-alt);
  border: 4px solid var(--color-border);
}

.person-image-large img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.person-info h1 {
  margin-bottom: var(--spacing-sm);
}

.person-section {
  margin-bottom: var(--spacing-xl);
}

.person-bio {
  font-family: var(--font-serif);
  line-height: 1.8;
}

/* ========================================
   Projects Grid
   ======================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.project-status {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.status-active {
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
}

.status-completed {
  background: rgba(107, 114, 128, 0.1);
  color: var(--color-text-light);
}

/* Project Detail */
.project-detail {
  padding: var(--spacing-3xl) 0;
}

.project-header {
  margin-bottom: var(--spacing-xl);
}

.project-image-large {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.project-image-large img {
  max-width: 100%;
  max-height: 500px;
  object-fit: contain;
  margin: 0 auto;
}

.project-meta {
  background: var(--color-background-alt);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-xl);
}

.project-meta p {
  margin-bottom: var(--spacing-sm);
}

.project-meta p:last-child {
  margin-bottom: 0;
}

.project-content {
  font-family: var(--font-serif);
  line-height: 1.8;
}

.project-content img {
  max-width: 100%;
  max-height: 500px;
  object-fit: contain;
  display: block;
  margin: var(--spacing-lg) auto;
  border-radius: var(--radius-md);
}

/* ========================================
   Publications
   ======================================== */
.publications-year {
  margin-bottom: var(--spacing-2xl);
}

.publications-year h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-accent);
}

.publication-list {
  list-style: none;
}

.publication-item {
  padding: var(--spacing-lg);
  background: var(--color-background);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  border-left: 4px solid var(--color-accent);
}

.publication-title {
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary-dark);
}

.publication-authors {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  margin-bottom: var(--spacing-sm);
}

.publication-venue {
  font-style: italic;
  color: var(--color-text-light);
  font-size: 0.875rem;
}

.publication-links {
  margin-top: var(--spacing-sm);
}

.publication-links a {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  margin-right: var(--spacing-sm);
}

.publication-links a:hover {
  background: var(--color-accent);
  color: #fff;
}

/* ========================================
   News
   ======================================== */
.news-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.news-item {
  display: flex;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: var(--color-background);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--color-accent);
}

.news-date {
  flex-shrink: 0;
  text-align: center;
  padding: var(--spacing-md);
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  min-width: 80px;
}

.news-date .day {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
}

.news-date .month {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  margin-top: var(--spacing-xs);
}

.news-content h3 {
  margin-bottom: var(--spacing-sm);
  font-size: 1.125rem;
}

.news-content p {
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* Homepage News (Compact) */
.news-list-compact .news-item {
  padding: var(--spacing-md);
}

.news-list-compact .news-date {
  min-width: 60px;
  padding: var(--spacing-sm);
}

.news-list-compact .news-date .day {
  font-size: 1.25rem;
}

/* ========================================
   Page Styles
   ======================================== */
.page {
  padding: var(--spacing-3xl) 0;
}

.page-header {
  margin-bottom: var(--spacing-2xl);
  text-align: center;
}

.page-title {
  margin-bottom: var(--spacing-sm);
}

.page-subtitle {
  color: var(--color-text-light);
  font-size: 1.125rem;
}

.page-content {
  font-family: var(--font-serif);
  line-height: 1.8;
}

.page-content h2 {
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
}

.page-content ul,
.page-content ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
}

.page-content li {
  margin-bottom: var(--spacing-sm);
}

/* ========================================
   Post Styles
   ======================================== */
.post {
  padding: var(--spacing-3xl) 0;
}

.post-header {
  margin-bottom: var(--spacing-2xl);
  text-align: center;
}

.post-date {
  color: var(--color-text-light);
  font-size: 0.875rem;
}

.post-content {
  font-family: var(--font-serif);
  line-height: 1.8;
  max-width: var(--container-narrow);
  margin: 0 auto;
}

/* ========================================
   Back Link
   ======================================== */
.back-link {
  display: inline-block;
  margin-top: var(--spacing-2xl);
  font-weight: 500;
  color: var(--color-primary);
}

.back-link:hover {
  color: var(--color-accent);
}

/* ========================================
   Intro Section (Homepage)
   ======================================== */
.intro-section {
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.intro-section p {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 1.8;
  max-width: 800px;
  margin: 0 auto;
  color: var(--color-text);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }

  .menu-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    display: none;
  }

  .main-nav.is-open {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .person-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

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

  .news-item {
    flex-direction: column;
  }

  .news-date {
    align-self: flex-start;
  }
}

@media (max-width: 480px) {
  .people-grid {
    grid-template-columns: 1fr;
  }

  .person-image {
    width: 120px;
    height: 120px;
  }
}

/* ========================================
   Hero Cards Slider
   ======================================== */
.hero-cards {
  position: relative;
  height: 70vh;
  min-height: 450px;
  max-height: 650px;
  overflow: hidden;
  background: var(--color-primary-dark);
}

.hero-cards-slider {
  display: flex;
  height: 100%;
  transition: transform 0.5s ease-in-out;
}

.hero-card {
  flex: 0 0 100%;
  position: relative;
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  background-color: var(--color-primary-dark);
}

.hero-card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.2) 0%, rgba(0,0,0,0.7) 100%);
}

.hero-card-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-3xl);
  color: #fff;
  z-index: 1;
}

.hero-card-content h2 {
  color: #fff;
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  text-shadow: 0 2px 4px rgba(0,0,0,0.4);
}

.hero-card-content p {
  font-size: 1.25rem;
  opacity: 0.95;
  text-shadow: 0 1px 2px rgba(0,0,0,0.4);
  max-width: 600px;
}

/* Hero Graphic Slide */
.hero-card-graphic {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
}

.hero-graphic-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-xl);
  gap: var(--spacing-2xl);
}

.hero-graphic-text {
  flex: 1;
  color: #fff;
  max-width: 500px;
}

.hero-graphic-text h2 {
  color: #fff;
  font-size: 3.5rem;
  margin-bottom: var(--spacing-xs);
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero-graphic-text .hero-tagline {
  font-size: 1.5rem;
  opacity: 0.9;
  margin-bottom: var(--spacing-lg);
  font-weight: 500;
}

.hero-graphic-text .hero-description {
  font-size: 1.1rem;
  opacity: 0.85;
  line-height: 1.7;
  margin-bottom: var(--spacing-xl);
}

.hero-graphic-text .btn {
  background: #fff;
  color: var(--color-primary-dark);
  border: none;
  font-weight: 600;
}

.hero-graphic-text .btn:hover {
  background: var(--color-accent);
  color: #fff;
}

.hero-graphic-image {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 500px;
}

.hero-graphic-image img {
  max-width: 100%;
  max-height: 400px;
  object-fit: contain;
  filter: drop-shadow(0 10px 30px rgba(0,0,0,0.3));
}

/* Hero Navigation */
.hero-cards-nav {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  z-index: 10;
}

.hero-nav-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  border: 2px solid rgba(255,255,255,0.5);
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-nav-btn:hover {
  background: rgba(255,255,255,0.3);
  border-color: #fff;
}

.hero-dots {
  display: flex;
  gap: var(--spacing-sm);
}

.hero-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.hero-dot:hover,
.hero-dot.active {
  background: #fff;
  transform: scale(1.2);
}

/* ========================================
   Hero Image Section (Legacy/Alternative)
   ======================================== */
.hero-image {
  position: relative;
  height: 70vh;
  min-height: 400px;
  max-height: 600px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.hero-image-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-size: cover;
  background-position: center;
  background-color: var(--color-primary-dark);
}

.hero-image-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.6) 100%);
}

.hero-image-content {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: var(--spacing-3xl) 0;
  color: #fff;
}

.hero-image-content h1 {
  color: #fff;
  font-size: 3.5rem;
  margin-bottom: var(--spacing-sm);
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero-image-content .hero-subtitle {
  font-size: 1.5rem;
  opacity: 0.95;
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  text-align: center;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

/* ========================================
   Gallery
   ======================================== */
.gallery-filter {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-2xl);
}

.filter-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-background-alt);
  border: 1px solid var(--color-border);
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.gallery-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--color-background-alt);
}

.gallery-link {
  display: block;
  width: 100%;
  height: 100%;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md);
  background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, transparent 100%);
  opacity: 0;
  transition: opacity var(--transition);
}

.gallery-item:hover .gallery-overlay {
  opacity: 1;
}

.gallery-caption {
  color: #fff;
  font-size: 0.875rem;
  font-weight: 500;
}

/* Lightbox */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.95);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-content {
  max-width: 90vw;
  max-height: 90vh;
  text-align: center;
}

.lightbox-content img {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
}

.lightbox-caption {
  color: #fff;
  margin-top: var(--spacing-md);
  font-size: 1rem;
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
  position: absolute;
  background: none;
  border: none;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  padding: var(--spacing-md);
  opacity: 0.7;
  transition: opacity var(--transition);
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
  opacity: 1;
}

.lightbox-close {
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  font-size: 2.5rem;
}

.lightbox-prev {
  left: var(--spacing-lg);
  top: 50%;
  transform: translateY(-50%);
  font-size: 3rem;
}

.lightbox-next {
  right: var(--spacing-lg);
  top: 50%;
  transform: translateY(-50%);
  font-size: 3rem;
}

/* ========================================
   Responsive - Hero & Gallery
   ======================================== */
@media (max-width: 768px) {
  .hero-cards {
    height: auto;
    min-height: 350px;
  }

  .hero-card-content {
    padding: var(--spacing-2xl);
  }

  .hero-graphic-container {
    flex-direction: column;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    gap: var(--spacing-lg);
  }

  .hero-graphic-text {
    max-width: 100%;
  }

  .hero-graphic-text h2 {
    font-size: 2.5rem;
  }

  .hero-graphic-text .hero-tagline {
    font-size: 1.2rem;
  }

  .hero-graphic-text .hero-description {
    font-size: 1rem;
  }

  .hero-graphic-image {
    max-width: 300px;
  }

  .hero-graphic-image img {
    max-height: 250px;
  }

  .hero-card-content h2 {
    font-size: 2rem;
  }

  .hero-card-content p {
    font-size: 1rem;
  }

  .hero-nav-btn {
    width: 36px;
    height: 36px;
    font-size: 1.25rem;
  }

  .hero-image {
    height: 50vh;
    min-height: 300px;
  }

  .hero-image-content h1 {
    font-size: 2.5rem;
  }

  .hero-image-content .hero-subtitle {
    font-size: 1.125rem;
  }

  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }

  .lightbox-prev,
  .lightbox-next {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .hero-cards {
    height: 45vh;
    min-height: 300px;
  }

  .hero-card-content h2 {
    font-size: 1.75rem;
  }

  .hero-card-content p {
    font-size: 0.9rem;
  }

  .hero-cards-nav {
    bottom: var(--spacing-md);
  }

  .hero-image-content h1 {
    font-size: 2rem;
  }

  .gallery-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
  }

  .gallery-item {
    aspect-ratio: 1;
  }
}

/* ========================================
   Under Development Notice
   ======================================== */
.under-development-notice {
  background-color: #fef3c7;
  border: 1px solid #f59e0b;
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.under-development-notice p {
  color: #92400e;
  font-weight: 500;
  margin: 0;
}

/* ========================================
   Presentation Mode
   ======================================== */
.presentation-mode {
  overflow: hidden;
}

.presentation-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

/* Progress bar at top */
.presentation-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  z-index: 100;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--color-accent);
  transition: width 0.05s linear;
}

/* Individual slides */
.presentation-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.6s ease, visibility 0.6s ease;
  padding: var(--spacing-2xl);
}

.presentation-slide.active {
  opacity: 1;
  visibility: visible;
}

/* Slide backgrounds */
.slide-dark {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: #fff;
}

.slide-dark h1,
.slide-dark h2,
.slide-dark h3 {
  color: #fff;
}

.slide-light {
  background: var(--color-background);
  color: var(--color-text);
}

.slide-alt {
  background: var(--color-background-alt);
  color: var(--color-text);
}

/* Slide content wrapper */
.slide-content {
  max-width: var(--container-max);
  width: 100%;
  text-align: center;
  padding: var(--spacing-xl);
}

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

.slide-content-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  text-align: left;
}

/* Typography */
.presentation-slide h1 {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
}

.presentation-slide h2 {
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
}

.slide-subtitle {
  font-size: 1.75rem;
  font-weight: 500;
  opacity: 0.9;
  margin-bottom: var(--spacing-md);
}

.slide-tagline {
  font-size: 1.125rem;
  opacity: 0.75;
  margin-bottom: 0;
}

.slide-lead {
  font-size: 1.25rem;
  line-height: 1.7;
  max-width: 700px;
  margin: 0 auto var(--spacing-xl);
  color: var(--color-text-light);
}

.slide-dark .slide-lead {
  color: rgba(255, 255, 255, 0.85);
}

.slide-label {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  margin-bottom: var(--spacing-md);
}

.slide-dark .slide-label {
  color: var(--color-accent-light);
}

.slide-url {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: var(--spacing-xl);
}

/* Logo on welcome slide */
.slide-logo {
  margin-bottom: var(--spacing-xl);
}

.slide-logo img {
  height: 150px;
  width: auto;
  margin: 0 auto;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
}

.slide-dark .slide-logo img {
  filter: brightness(0) invert(1) drop-shadow(0 4px 12px rgba(0, 0, 0, 0.5));
}

/* Mission list with icons */
.mission-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
  text-align: left;
}

.mission-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-background-alt);
  border-radius: var(--radius-md);
}

.mission-icon {
  font-size: 1.75rem;
  flex-shrink: 0;
  line-height: 1;
}

.mission-item p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
}

/* Vision block */
.vision-block {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  margin-top: var(--spacing-lg);
}

.vision-block p {
  margin: 0;
  font-size: 1.125rem;
  line-height: 1.7;
}

/* Innovation cycle graphic */
.innovation-graphic {
  margin-top: var(--spacing-xl);
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.innovation-graphic img {
  width: 100%;
  height: auto;
  max-height: 50vh;
  object-fit: contain;
}

/* Research areas grid */
.research-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.research-item {
  padding: var(--spacing-lg) var(--spacing-md);
  background: var(--color-background);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9375rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--spacing-sm);
  min-height: 120px;
}

.research-icon {
  font-size: 2rem;
  line-height: 1;
}

/* Project slides */
.project-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.project-visual {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.project-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-height: 400px;
}

.project-visual iframe {
  width: 100%;
  height: 100%;
  min-height: 320px;
  border: none;
  display: block;
}

.project-meta-line {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

/* BEAR Summit visual cards */
.bear-visual-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.bear-visual-card {
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(4px);
}

.bear-image {
  aspect-ratio: 16/10;
  overflow: hidden;
}

.bear-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bear-text {
  padding: var(--spacing-lg);
  text-align: center;
}

.bear-text h3 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xs);
  color: #fff;
}

.bear-text p {
  font-size: 0.875rem;
  opacity: 0.85;
  margin-bottom: 0;
  color: #fff;
}

/* Contact block */
.contact-block {
  background: var(--color-background);
  border-radius: var(--radius-md);
  padding: var(--spacing-xl);
  margin-top: var(--spacing-xl);
  text-align: left;
}

.contact-block p {
  margin-bottom: var(--spacing-sm);
}

.contact-block p:last-child {
  margin-bottom: 0;
}

/* Navigation */
.presentation-nav {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  z-index: 50;
}

.presentation-nav-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.5);
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.presentation-nav-btn:hover {
  background: rgba(255, 255, 255, 0.35);
  border-color: #fff;
}

.presentation-dots {
  display: flex;
  gap: var(--spacing-sm);
}

.presentation-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.presentation-dot:hover,
.presentation-dot.active {
  background: #fff;
  transform: scale(1.2);
}

/* ========================================
   Presentation Responsive
   ======================================== */
@media (max-width: 768px) {
  .presentation-slide h1 {
    font-size: 2.5rem;
  }

  .presentation-slide h2 {
    font-size: 2rem;
  }

  .slide-content-split {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-xl);
  }

  .project-visual {
    order: -1;
  }

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

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

  .bear-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .bear-visual-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .mission-item {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .mission-icon {
    font-size: 1.5rem;
  }

  .innovation-graphic img {
    max-height: 35vh;
  }

  .slide-logo img {
    height: 100px;
  }
}

@media (max-width: 480px) {
  .presentation-slide {
    padding: var(--spacing-lg);
  }

  .presentation-slide h1 {
    font-size: 2rem;
  }

  .presentation-slide h2 {
    font-size: 1.5rem;
  }

  .slide-subtitle {
    font-size: 1.25rem;
  }

  .cycle-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
  }

  .cycle-item {
    padding: var(--spacing-md);
    font-size: 0.8125rem;
  }

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

  .presentation-nav {
    bottom: var(--spacing-md);
  }

  .presentation-nav-btn {
    width: 36px;
    height: 36px;
    font-size: 1.25rem;
  }
}