/* ========================================
   Root & Theme Variables
   ======================================== */

:root {
  --color-bg: #fafaf8;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #666666;
  --color-border: #e5e5e0;
  --color-accent: #2d5a3d;
  --color-accent-light: #4a8560;
  --color-accent-muted: #d4e5dc;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-mono: "Courier New", Courier, monospace;

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

  --border-radius: 6px;
  --transition: 0.2s ease;
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f0f0f;
    --color-surface: #1a1a1a;
    --color-text: #f5f5f5;
    --color-text-secondary: #a0a0a0;
    --color-border: #333333;
    --color-accent: #5fb882;
    --color-accent-light: #7bc99f;
    --color-accent-muted: #1f4d32;
  }
}

/* ========================================
   Base Styles
   ======================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

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

button {
  font-family: var(--font-family);
  cursor: pointer;
  border: none;
  background: none;
}

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

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 3rem;
  font-weight: 700;
}

h2 {
  font-size: 2.25rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

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

.lead {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.tagline {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
}

/* ========================================
   Container & Layout
   ======================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.grid {
  display: grid;
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}

/* ========================================
   Header & Navigation
   ======================================== */

.header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.95);
}

@media (prefers-color-scheme: dark) {
  .header {
    background-color: rgba(26, 26, 26, 0.95);
  }
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  transition: opacity var(--transition);
}

.brand:hover {
  opacity: 0.8;
}

.brand-mark {
  font-size: 1.5rem;
  color: var(--color-accent);
}

/* Logo shield styling - crops PNG to show only shield, not text */
.logo-shield {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.logo-shield img {
  width: 40px;
  height: auto;
  object-fit: cover;
  object-position: center 0%;
  display: block;
}

.brand-badge-img {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    object-fit: cover;
}

.brand-name {
  color: var(--color-text);
}

.nav-right {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-menu a {
  color: var(--color-text);
  font-weight: 500;
  transition: color var(--transition);
  padding: var(--spacing-xs) 0;
  border-bottom: 2px solid transparent;
}

.nav-menu a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.lang-toggle,
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-weight: 600;
  color: var(--color-accent);
  cursor: pointer;
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md);
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .lang-toggle {
    display: block;
  }
}

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

.hero {
  padding: var(--spacing-2xl) 0;
}

.hero-content {
  max-width: 800px;
}

.hero h1 {
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.availability {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-md);
}

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius);
  font-weight: 600;
  transition: all var(--transition);
  text-align: center;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background-color: var(--color-accent);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-accent-light);
  transform: translateY(-2px);
}

.btn-secondary {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-secondary:hover {
  background-color: var(--color-accent-muted);
}

.btn-large {
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: 1.1rem;
}

.hero-ctas {
  display: flex;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  flex-wrap: wrap;
}

/* ========================================
   Sections
   ======================================== */

.section {
  padding: var(--spacing-2xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.page-header {
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.page-header h1 {
  margin-bottom: var(--spacing-md);
}

/* ========================================
   Cards
   ======================================== */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  transition: all var(--transition);
}

.card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(45, 90, 61, 0.1);
}

.card h3 {
  margin-top: 0;
}

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

/* ========================================
   Featured Talk Section
   ======================================== */

.featured-talk-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

@media (max-width: 900px) {
  .featured-talk-content {
    grid-template-columns: 1fr;
  }
}

.video-embed {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.featured-talk-text h2 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.featured-talk-text h3 {
  margin-bottom: var(--spacing-md);
}

/* ========================================
   What I Do / Cards
   ======================================== */

.what-i-do h2,
.philosophy h2,
.recent-thinking h2 {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.card h3 {
  color: var(--color-accent);
}

/* ========================================
   Recent Thinking
   ======================================== */

.thinking-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.thinking-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  transition: all var(--transition);
}

.thinking-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(45, 90, 61, 0.1);
}

.thinking-meta {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-sm);
}

.thinking-card h3 {
  margin-top: 0;
  color: var(--color-text);
}

.thinking-card a {
  display: inline-block;
  margin-top: var(--spacing-md);
  font-weight: 600;
}

/* ========================================
   Philosophy
   ======================================== */

.philosophy blockquote {
  font-size: 1.5rem;
  font-style: italic;
  text-align: center;
  color: var(--color-text);
  line-height: 1.8;
  border-left: 4px solid var(--color-accent);
  padding-left: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.philosophy-section h2 {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

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

.philosophy-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  border-left: 4px solid var(--color-accent);
}

.philosophy-card h3 {
  color: var(--color-accent);
  margin-top: 0;
}

/* ========================================
   Experience Highlights
   ======================================== */

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-2xl) 0;
}

.highlight-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  border-left: 4px solid var(--color-accent);
}

.highlight-year {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.highlight-text h4 {
  margin: var(--spacing-md) 0 var(--spacing-sm) 0;
  color: var(--color-text);
}

.highlight-text p {
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* ========================================
   Skills
   ======================================== */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-2xl) 0;
}

.skill-group {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
}

.skill-group h4 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-md);
  margin-top: 0;
}

.skill-group ul {
  list-style: none;
  padding: 0;
}

.skill-group li {
  padding: var(--spacing-xs) 0;
  color: var(--color-text-secondary);
}

.skill-group li:before {
  content: "→ ";
  color: var(--color-accent);
  margin-right: var(--spacing-sm);
}

/* ========================================
   CTA Section
   ======================================== */

.cta-final {
  text-align: center;
  background: linear-gradient(135deg, var(--color-accent-muted), transparent);
  border-radius: var(--border-radius);
  padding: var(--spacing-2xl);
}

.cta-final h2 {
  margin-bottom: var(--spacing-md);
}

.cta-final p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ========================================
   Content Layout
   ======================================== */

.content-wide {
  max-width: 800px;
}

.content-wide h3 {
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-accent);
}

.content-wide ul {
  list-style: none;
  padding: 0;
  margin-bottom: var(--spacing-lg);
}

.content-wide li {
  padding: var(--spacing-sm) 0 var(--spacing-sm) var(--spacing-lg);
  border-left: 3px solid var(--color-accent);
  padding-left: var(--spacing-lg);
  position: relative;
}

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

.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-2xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-content p {
  font-size: 0.95rem;
  margin-bottom: var(--spacing-sm);
}

.footer-content strong {
  color: var(--color-accent);
  display: block;
  margin-bottom: var(--spacing-sm);
}

.footer-content ul {
  list-style: none;
  padding: 0;
}

.footer-content li {
  padding: var(--spacing-xs) 0;
}

.footer-content a {
  color: var(--color-accent);
  font-weight: 500;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

/* ========================================
   Utility Classes
   ======================================== */

.meta {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

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

/* ========================================
   Projects Page
   ======================================== */

.project-hero {
  margin: var(--spacing-2xl) 0;
}

.project-content h2 {
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.project-content h3 {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  margin-top: 0;
}

.project-content h4 {
  color: var(--color-accent);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: var(--spacing-lg) 0;
}

.feature-list li {
  padding: var(--spacing-sm) 0 var(--spacing-sm) var(--spacing-lg);
  border-left: 3px solid var(--color-accent);
  position: relative;
}

.feature-list strong {
  color: var(--color-accent);
}

.project-ctas {
  display: flex;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  flex-wrap: wrap;
}

.philosophy-insight {
  background: var(--color-accent-muted);
  border-left: 4px solid var(--color-accent);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  margin-top: var(--spacing-2xl);
}

.philosophy-insight h4 {
  color: var(--color-accent);
  margin-top: 0;
}

/* ========================================
   Contact Page
   ======================================== */

.contact-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-2xl);
  margin: var(--spacing-2xl) 0;
}

@media (max-width: 900px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

.contact-form-wrapper h2 {
  margin-bottom: var(--spacing-lg);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-group label {
  font-weight: 600;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-family);
  font-size: 1rem;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(45, 90, 61, 0.1);
}

/* Form error & success feedback */

.form-success {
  background-color: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

@media (prefers-color-scheme: dark) {
  .form-success {
    background-color: #1f4d32;
    color: #5fb882;
    border-color: #3d6b4a;
  }
}

.form-success p {
  margin-bottom: 0;
}

.form-error {
  background-color: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  min-height: 20px;
}

@media (prefers-color-scheme: dark) {
  .form-error {
    background-color: #4d2125;
    color: #f8a5a5;
    border-color: #6b3d41;
  }
}

.field-error {
  display: block;
  color: #dc3545;
  font-size: 0.85rem;
  margin-top: var(--spacing-xs);
}

@media (prefers-color-scheme: dark) {
  .field-error {
    color: #f8a5a5;
  }
}

/* Disabled submit button state */

button[data-fs-submit-btn]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.contact-info h2 {
  margin-bottom: var(--spacing-lg);
}

.info-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.info-card h4 {
  color: var(--color-accent);
  margin: 0 0 var(--spacing-sm) 0;
}

.info-card p {
  margin-bottom: var(--spacing-sm);
}

.info-card p:last-child {
  margin-bottom: 0;
}

.info-card a {
  font-weight: 600;
}

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

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .hero {
    padding: var(--spacing-xl) 0;
  }

  .section {
    padding: var(--spacing-xl) 0;
  }

  .hero-ctas {
    flex-direction: column;
  }

  .hero-ctas .btn {
    width: 100%;
  }

  .featured-talk-content {
    gap: var(--spacing-lg);
  }

  .project-ctas {
    flex-direction: column;
  }

  .project-ctas .btn {
    width: 100%;
  }
}