:root {
  --color-bg: #FAF8F5;
  --color-bg-elevated: #F0EBE5;
  --color-text: #2C2825;
  --color-text-secondary: #5A534B;
  --color-text-muted: #8B8078;
  --color-accent: #8B4513;
  --color-accent-hover: #6B3410;
  --color-border: #E5E0DA;
  --color-input-border: #DDD7CF;
  --color-input-focus-bg: #fff;
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --shadow-sm: 0 1px 2px rgba(44, 40, 37, 0.04);
  --shadow-card: 0 1px 3px rgba(44, 40, 37, 0.06), 0 1px 2px rgba(44, 40, 37, 0.04);
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #1a1a1a;
    --color-bg-elevated: #252525;
    --color-text: #e8e4e0;
    --color-text-secondary: #b8b0a8;
    --color-text-muted: #8a8078;
    --color-accent: #d4a574;
    --color-accent-hover: #e8c49c;
    --color-border: #3a3632;
    --color-input-border: #4a4642;
    --color-input-focus-bg: #2a2a2a;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  }
}

/* Manual dark mode override */
:root[data-theme="dark"] {
  --color-bg: #1a1a1a;
  --color-bg-elevated: #252525;
  --color-text: #e8e4e0;
  --color-text-secondary: #b8b0a8;
  --color-text-muted: #8a8078;
  --color-accent: #d4a574;
  --color-accent-hover: #e8c49c;
  --color-border: #3a3632;
  --color-input-border: #4a4642;
  --color-input-focus-bg: #2a2a2a;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
}

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

body {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.65;
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.container {
  max-width: 620px;
  margin: 0 auto;
  padding: 4rem 1.5rem 3rem;
}

/* Header */
header {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.header-content {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.headshot img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  filter: grayscale(20%) sepia(8%);
  transition: filter var(--transition-base);
}

.headshot img:hover {
  filter: grayscale(0%) sepia(0%);
}

h1 {
  font-size: 1.75rem;
  font-weight: 400;
  margin: 0;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.tagline {
  font-style: italic;
  color: var(--color-text-secondary);
  margin: 0.25rem 0 0 0;
  font-size: 1rem;
}

/* Sections */
section {
  margin-bottom: 2.75rem;
}

#about p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.7;
}

h2 {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin: 0 0 1rem 0;
}

/* Highlight section (podcast) */
.highlight-section {
  background: var(--color-bg-elevated);
  border-radius: 8px;
  padding: 1.75rem;
  margin-bottom: 2.75rem;
  box-shadow: var(--shadow-card);
}

.highlight-section p {
  margin: 0;
  color: var(--color-text-secondary);
}

.highlight-section a {
  color: var(--color-text);
  transition: color var(--transition-fast);
}

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

.highlight-section .podcast-list {
  margin-top: 0.5rem;
}

.highlight-section .podcast-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}

.highlight-section .podcast-list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.highlight-section .podcast-list li:first-child {
  padding-top: 0;
}

/* Lists */
ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

li {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--color-border);
}

li:last-child {
  border-bottom: none;
}

li > a, li > strong {
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

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

.blurb {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin: 0.4rem 0 0 0;
  line-height: 1.55;
}

/* Contact */
#contact {
  border-top: 1px solid var(--color-border);
  padding-top: 2.25rem;
}

#contact > p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-row {
  display: flex;
  gap: 1rem;
}

.form-row .form-group {
  flex: 1;
}

.form-group label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  font-size: 1rem;
  font-family: var(--font-serif);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-input-border);
  border-radius: 5px;
  color: var(--color-text);
  transition: border-color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--color-input-focus-bg);
  box-shadow: 0 0 0 3px rgba(139, 69, 19, 0.08);
}

.form-group textarea {
  resize: vertical;
}

button {
  align-self: flex-start;
  padding: 0.7rem 1.5rem;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  font-weight: 500;
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

button:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
}

button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Math challenge field */
.math-challenge {
  max-width: 280px;
}

.math-challenge label {
  font-size: 0.85rem;
  color: var(--color-text);
  text-transform: none;
  letter-spacing: normal;
}

.math-challenge input {
  max-width: 100px;
}

/* Footer */
footer {
  margin-top: 3.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: center;
}

.social-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.social-links a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast), transform var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.social-links a:hover {
  color: var(--color-accent);
  transform: translateY(-2px);
}

.social-links svg {
  width: 20px;
  height: 20px;
}

/* Responsive */
@media (max-width: 550px) {
  .container {
    padding: 2.5rem 1.25rem 2rem;
  }

  .form-row {
    flex-direction: column;
  }

  h1 {
    font-size: 1.5rem;
  }

  .headshot img {
    width: 64px;
    height: 64px;
  }

  #about p {
    font-size: 1rem;
  }

  .highlight-section {
    padding: 1.25rem;
  }
}

/* Print styles */
@media print {
  #contact {
    display: none;
  }

  body {
    background: #fff;
  }

  .highlight-section {
    box-shadow: none;
    border: 1px solid var(--color-border);
  }
}

/* Theme toggle */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: 5px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
  box-shadow: var(--shadow-card);
  transition: background var(--transition-fast), color var(--transition-fast), opacity var(--transition-base);
  padding: 0.5rem 0.75rem;
}

.theme-toggle:hover {
  background: var(--color-bg);
  color: var(--color-text-secondary);
}

.theme-toggle.hidden {
  opacity: 0;
  pointer-events: none;
}

.theme-toggle .label-dark,
.theme-toggle .label-light {
  display: none;
}

/* Show "Dark Mode" in light mode (to switch to dark) */
:root[data-theme="light"] .theme-toggle .label-dark {
  display: inline;
}

/* Show "Light Mode" in dark mode (to switch to light) */
:root[data-theme="dark"] .theme-toggle .label-light {
  display: inline;
}

/* Default (no data-theme set) - follow system preference */
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .theme-toggle .label-dark {
    display: inline;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .theme-toggle .label-light {
    display: inline;
  }
}

/* Honeypot fields - hidden from humans, visible to bots */
.form-guard {
  position: absolute;
  left: -9999px;
  top: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  overflow: hidden;
  pointer-events: none;
}

/* Form error message */
.form-error {
  color: #c53030;
  font-size: 0.9rem;
  margin: 0.5rem 0 0 0;
  display: none;
}

:root[data-theme="dark"] .form-error,
:root:not([data-theme="light"]) .form-error {
  color: #fc8181;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .form-error {
    color: #c53030;
  }
}

/* Submit button disabled state */
button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

button:disabled:hover {
  transform: none;
}