/* ============================================
   Brad Tenenholtz - btencyber.com
   Design: Clean, serious, policy-forward
   ============================================ */

/* CSS Variables */
:root {
  /* Colors - Navy/Slate/White palette */
  --color-navy: #1a2744;
  --color-navy-dark: #0f1829;
  --color-slate: #4a5568;
  --color-slate-light: #718096;
  --color-accent: #2c5282;
  --color-accent-hover: #2b6cb0;
  --color-white: #ffffff;
  --color-off-white: #f7fafc;
  --color-border: #e2e8f0;

  /* Typography */
  --font-heading: 'Libre Baskerville', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  /* Container */
  --container-max: 1100px;
  --container-narrow: 800px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-slate);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-navy);
  line-height: 1.3;
  font-weight: 400;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: 1.875rem;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 1.375rem;
  margin-bottom: var(--spacing-sm);
}

h4 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xs);
}

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

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

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

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

strong {
  font-weight: 600;
  color: var(--color-navy);
}

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

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

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

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header__brand {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--color-navy);
  text-decoration: none;
  font-weight: 400;
}

.header__brand:hover {
  color: var(--color-navy);
  text-decoration: none;
}

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

.nav__link {
  font-size: 0.9375rem;
  color: var(--color-slate);
  text-decoration: none;
  transition: color var(--transition-fast);
  padding: var(--spacing-xs) 0;
}

.nav__link:hover {
  color: var(--color-navy);
  text-decoration: none;
}

.nav__link--active {
  color: var(--color-navy);
  font-weight: 500;
}

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

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

.nav__toggle-icon::before,
.nav__toggle-icon::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: var(--color-navy);
  left: 0;
}

.nav__toggle-icon::before {
  top: -7px;
}

.nav__toggle-icon::after {
  top: 7px;
}

.nav-overlay {
  display: none;
}

/* Buttons */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

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

.btn--primary:hover {
  background-color: var(--color-navy-dark);
  color: var(--color-white);
  text-decoration: none;
}

.btn--outline {
  background-color: transparent;
  color: var(--color-navy);
  border: 2px solid var(--color-navy);
}

.btn--outline:hover {
  background-color: var(--color-navy);
  color: var(--color-white);
  text-decoration: none;
}

/* Hero Section */
.hero {
  padding: var(--spacing-3xl) 0;
  background-color: var(--color-off-white);
  border-bottom: 1px solid var(--color-border);
}

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

.hero__image {
  width: 100%;
  max-width: 280px;
  aspect-ratio: 1;
  border-radius: 4px;
  background-color: var(--color-border);
  object-fit: cover;
}

.hero__content {
  max-width: 600px;
}

.hero__title {
  font-size: 2.75rem;
  margin-bottom: var(--spacing-xs);
}

.hero__subtitle {
  font-family: var(--font-body);
  font-size: 1.125rem;
  color: var(--color-slate);
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}

.hero__tagline {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  color: var(--color-slate-light);
  font-style: italic;
  margin-bottom: var(--spacing-lg);
}

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

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

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

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

.section__intro {
  font-size: 1.125rem;
  color: var(--color-slate-light);
  max-width: 700px;
}

/* Thesis Block */
.thesis {
  background-color: var(--color-white);
  padding: var(--spacing-3xl) 0;
}

.thesis__content {
  max-width: var(--container-narrow);
  margin: 0 auto;
  text-align: center;
}

.thesis__quote {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  line-height: 1.6;
  color: var(--color-navy);
  position: relative;
  padding: 0 var(--spacing-lg);
}

.thesis__quote::before {
  content: '"';
  position: absolute;
  left: 0;
  top: -0.25em;
  font-size: 3rem;
  color: var(--color-border);
  font-family: var(--font-heading);
}

/* Credibility Section */
.credibility {
  background-color: var(--color-off-white);
  padding: var(--spacing-2xl) 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.credibility__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.credibility__item {
  text-align: center;
}

.credibility__label {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-slate-light);
  margin-bottom: var(--spacing-xs);
}

.credibility__value {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--color-navy);
  line-height: 1.5;
}

/* Speaking Topics */
.topic {
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.topic:last-of-type {
  border-bottom: none;
}

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

.topic__title {
  margin-bottom: var(--spacing-xs);
}

.topic__subtitle {
  font-style: italic;
  color: var(--color-slate-light);
  font-size: 1.0625rem;
}

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

.topic__audience {
  font-size: 0.9375rem;
  color: var(--color-slate-light);
}

.topic__audience strong {
  color: var(--color-slate);
}

/* Engagements */
.engagements {
  padding: var(--spacing-xl) 0;
}

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

.engagements__section:last-child {
  margin-bottom: 0;
}

.engagements__title {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-slate-light);
  margin-bottom: var(--spacing-md);
  font-family: var(--font-body);
  font-weight: 600;
}

.engagements__list {
  list-style: none;
}

.engagements__item {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.engagements__item:last-child {
  border-bottom: none;
}

.engagements__event {
  font-weight: 500;
  color: var(--color-navy);
}

.engagements__talk {
  color: var(--color-slate);
}

/* Ideas / Articles */
.articles__featured {
  margin-bottom: var(--spacing-2xl);
}

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

.articles__series-intro {
  margin-bottom: var(--spacing-lg);
  color: var(--color-slate-light);
}

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

.article-item {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.article-item:last-child {
  border-bottom: none;
}

.article-item__link {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  color: var(--color-navy);
  display: inline-block;
  margin-bottom: var(--spacing-xs);
}

.article-item__link:hover {
  color: var(--color-accent);
}

.article-item__description {
  font-size: 0.9375rem;
  color: var(--color-slate-light);
  margin-bottom: 0;
}

.article-item--upcoming {
  opacity: 0.7;
}

.article-item--upcoming .article-item__link {
  color: var(--color-slate-light);
  cursor: default;
}

.article-item--upcoming .article-item__link:hover {
  text-decoration: none;
}

/* About / Bio */
.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

.about-grid__image {
  width: 100%;
  max-width: 280px;
  border-radius: 4px;
  object-fit: cover;
}

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

.bio {
  margin-bottom: var(--spacing-2xl);
}

.bio p {
  font-size: 1.0625rem;
}

.credentials {
  background-color: var(--color-off-white);
  padding: var(--spacing-lg);
  border-radius: 4px;
}

.credentials__title {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-slate-light);
  margin-bottom: var(--spacing-md);
  font-family: var(--font-body);
  font-weight: 600;
}

.credentials__list {
  list-style: none;
}

.credentials__item {
  padding: var(--spacing-xs) 0;
  color: var(--color-slate);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.credentials__item::before {
  content: '—';
  color: var(--color-slate-light);
  flex-shrink: 0;
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

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

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

.form-label {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-navy);
}

.form-input {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background-color: var(--color-white);
  color: var(--color-slate);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(44, 82, 130, 0.1);
}

.form-input::placeholder {
  color: var(--color-slate-light);
}

textarea.form-input {
  resize: vertical;
  min-height: 120px;
}

select.form-input {
  cursor: pointer;
}

.contact-form .btn {
  align-self: flex-start;
  margin-top: var(--spacing-sm);
}

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

/* CTA Section */
.cta {
  text-align: center;
  padding: var(--spacing-3xl) 0;
  background-color: var(--color-navy);
  color: var(--color-white);
}

.cta__title {
  color: var(--color-white);
  margin-bottom: var(--spacing-sm);
}

.cta__text {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-lg);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

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

.cta .btn--primary:hover {
  background-color: var(--color-off-white);
}

/* Footer */
.footer {
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer__content {
  font-size: 0.875rem;
  color: var(--color-slate-light);
}

.footer__email {
  color: var(--color-slate);
}

/* Page Header (for inner pages) */
.page-header {
  padding: var(--spacing-2xl) 0;
  background-color: var(--color-off-white);
  border-bottom: 1px solid var(--color-border);
}

.page-header__title {
  margin-bottom: var(--spacing-xs);
}

.page-header__intro {
  font-size: 1.125rem;
  color: var(--color-slate-light);
  max-width: 700px;
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mt-xl {
  margin-top: var(--spacing-xl);
}

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

/* External Link Icon */
a[target="_blank"]::after {
  content: ' ↗';
  font-size: 0.75em;
  opacity: 0.7;
}

.btn[target="_blank"]::after {
  content: none;
}

/* Responsive Design */
@media (max-width: 900px) {
  .hero__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__image {
    margin: 0 auto;
    max-width: 220px;
  }

  .hero__content {
    max-width: 100%;
  }

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

  .about-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about-grid__image {
    max-width: 220px;
    margin: 0 auto;
  }

  .about-grid__content {
    text-align: left;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.625rem;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

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

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

  .hero__title {
    font-size: 2rem;
  }

  /* Mobile Navigation */
  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100vh;
    background-color: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-3xl) var(--spacing-lg);
    gap: var(--spacing-md);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
    transition: right var(--transition-base);
    z-index: 200;
  }

  .nav--open {
    right: 0;
  }

  .nav__link {
    font-size: 1.125rem;
    padding: var(--spacing-sm) 0;
  }

  .nav__toggle {
    display: block;
    z-index: 300;
  }

  .nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 150;
  }

  .nav-overlay--visible {
    display: block;
  }

  .thesis__quote {
    font-size: 1.125rem;
    padding: 0;
  }

  .thesis__quote::before {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero__image {
    max-width: 180px;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

  .header__brand {
    font-size: 1.125rem;
  }
}

/* Print Styles */
@media print {
  .header,
  .nav,
  .cta,
  .footer {
    display: none;
  }

  .section {
    padding: 1rem 0;
  }

  body {
    font-size: 12pt;
  }
}