/* ==========================================================================
   Scott Leimroth - Personal Website Stylesheet
   Modern, minimalist design with mobile-first responsive approach
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Variables)
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Professional Blues/Grays with Accent */
  --color-primary: #1a365d;        /* Deep navy blue */
  --color-primary-light: #2c5282;  /* Lighter navy */
  --color-primary-dark: #0f2744;   /* Darker navy */
  --color-accent: #3182ce;         /* Bright blue accent */
  --color-accent-hover: #2b6cb0;   /* Accent hover state */

  /* Neutral Colors */
  --color-white: #ffffff;
  --color-gray-50: #f8fafc;        /* Very light gray (backgrounds) */
  --color-gray-100: #f1f5f9;       /* Light gray */
  --color-gray-200: #e2e8f0;       /* Border gray */
  --color-gray-300: #cbd5e1;       /* Muted elements */
  --color-gray-400: #94a3b8;       /* Placeholder text */
  --color-gray-500: #64748b;       /* Secondary text */
  --color-gray-600: #475569;       /* Body text */
  --color-gray-700: #334155;       /* Headings */
  --color-gray-800: #1e293b;       /* Dark text */
  --color-gray-900: #0f172a;       /* Near black */

  /* Semantic Colors */
  --color-text: var(--color-gray-700);
  --color-text-light: var(--color-gray-500);
  --color-text-dark: var(--color-gray-900);
  --color-background: var(--color-white);
  --color-background-alt: var(--color-gray-50);
  --color-border: var(--color-gray-200);

  /* Typography */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-family-heading: var(--font-family-primary);

  /* Font Sizes - Mobile First (rem) */
  --font-size-xs: 0.75rem;     /* 12px */
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg: 1.125rem;    /* 18px */
  --font-size-xl: 1.25rem;     /* 20px */
  --font-size-2xl: 1.5rem;     /* 24px */
  --font-size-3xl: 1.875rem;   /* 30px */
  --font-size-4xl: 2.25rem;    /* 36px */
  --font-size-5xl: 3rem;       /* 48px */

  /* Font Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;

  /* Spacing Scale */
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */

  /* Layout */
  --container-max-width: 1200px;
  --container-padding: var(--spacing-4);
  --header-height: 70px;

  /* Borders */
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 1rem;
  --border-radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-relaxed);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-4);
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

h4 {
  font-size: var(--font-size-lg);
}

h5 {
  font-size: var(--font-size-base);
}

h6 {
  font-size: var(--font-size-sm);
}

p {
  margin-bottom: var(--spacing-4);
}

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

blockquote {
  font-size: var(--font-size-lg);
  font-style: italic;
  color: var(--color-text-light);
  border-left: 4px solid var(--color-accent);
  padding-left: var(--spacing-6);
  margin: var(--spacing-8) 0;
}

blockquote cite {
  display: block;
  font-size: var(--font-size-sm);
  font-style: normal;
  margin-top: var(--spacing-2);
  color: var(--color-gray-500);
}

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

.section {
  padding: var(--spacing-12) 0;
}

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

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

.section--primary h1,
.section--primary h2,
.section--primary h3 {
  color: var(--color-white);
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: box-shadow var(--transition-normal);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-decoration: none;
}

.header__logo:hover {
  color: var(--color-primary-light);
  text-decoration: none;
}

/* Desktop Navigation */
.nav {
  display: none;
}

.nav__list {
  display: flex;
  gap: var(--spacing-6);
}

.nav__link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--spacing-2) 0;
  position: relative;
}

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

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

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 30px;
  height: 30px;
  cursor: pointer;
  z-index: 1001;
}

.menu-toggle__bar {
  width: 100%;
  height: 3px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: all var(--transition-normal);
}

.menu-toggle.active .menu-toggle__bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.menu-toggle.active .menu-toggle__bar:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active .menu-toggle__bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Navigation */
.mobile-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-white);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  z-index: 999;
  overflow-y: auto;
}

.mobile-nav.active {
  transform: translateX(0);
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-6);
}

.mobile-nav__link {
  display: block;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  padding: var(--spacing-4) 0;
  border-bottom: 1px solid var(--color-border);
}

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

/* Body offset for fixed header */
.main {
  padding-top: var(--header-height);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--spacing-16) 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-white);
}

.hero__image {
  width: 180px;
  height: 180px;
  border-radius: var(--border-radius-full);
  object-fit: cover;
  object-position: top center;
  border: 4px solid var(--color-white);
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--spacing-6);
}

.hero__title {
  font-size: var(--font-size-3xl);
  color: var(--color-white);
  margin-bottom: var(--spacing-2);
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.9);
  font-weight: var(--font-weight-normal);
  margin-bottom: var(--spacing-6);
}

.hero__degrees {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.75);
  font-weight: var(--font-weight-normal);
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-2);
}

.hero__intro {
  max-width: 700px;
  font-size: var(--font-size-base);
  color: rgba(255, 255, 255, 0.85);
  line-height: var(--line-height-relaxed);
}

.hero__quote {
  max-width: 800px;
  font-size: var(--font-size-lg);
  font-style: italic;
  color: rgba(255, 255, 255, 0.9);
  margin-top: var(--spacing-8);
  padding: var(--spacing-6);
  border-left: none;
  border-top: 1px solid rgba(255, 255, 255, 0.3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.hero__quote cite {
  color: rgba(255, 255, 255, 0.7);
}

/* --------------------------------------------------------------------------
   Cards & Content Blocks
   -------------------------------------------------------------------------- */
.cards {
  display: grid;
  gap: var(--spacing-6);
  grid-template-columns: 1fr;
}

.card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.card__image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card__content {
  padding: var(--spacing-6);
}

.card__icon {
  width: 80px;
  height: 80px;
  margin-bottom: var(--spacing-4);
}

.card__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-2);
}

.card__description {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-4);
}

.card__link {
  display: inline-flex;
  align-items: center;
  font-weight: var(--font-weight-medium);
  color: var(--color-accent);
}

.card__link::after {
  content: ' \2192';
  margin-left: var(--spacing-2);
  transition: margin-left var(--transition-fast);
}

.card__link:hover::after {
  margin-left: var(--spacing-3);
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.about {
  display: grid;
  gap: var(--spacing-8);
  align-items: center;
}

.about__content h2 {
  margin-bottom: var(--spacing-4);
}

.about__content p {
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Article Styles (for Research/Publications)
   -------------------------------------------------------------------------- */
.article {
  background-color: var(--color-white);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-6);
  margin-bottom: var(--spacing-6);
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--color-accent);
}

.article__title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-2);
}

.article__meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-3);
}

.article__description {
  color: var(--color-text);
}

.article__link {
  display: inline-block;
  margin-top: var(--spacing-3);
  font-weight: var(--font-weight-medium);
}

/* --------------------------------------------------------------------------
   Awards/Credentials List
   -------------------------------------------------------------------------- */
.credentials {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-6);
}

.credential {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-1) var(--spacing-3);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.contact {
  text-align: center;
}

.contact__email {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
}

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

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  background-color: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--spacing-8) 0;
  text-align: center;
}

.footer__text {
  font-size: var(--font-size-sm);
}

.footer a {
  color: var(--color-gray-300);
}

.footer a:hover {
  color: var(--color-white);
}

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

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

.text-right {
  text-align: right;
}

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-6 { margin-bottom: var(--spacing-6); }
.mb-8 { margin-bottom: var(--spacing-8); }

.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--spacing-4); }
.mt-6 { margin-top: var(--spacing-6); }
.mt-8 { margin-top: var(--spacing-8); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   Media Queries - Responsive Breakpoints
   -------------------------------------------------------------------------- */

/* Tablet (768px and up) */
@media (min-width: 768px) {
  :root {
    --container-padding: var(--spacing-6);
  }

  h1 {
    font-size: var(--font-size-4xl);
  }

  h2 {
    font-size: var(--font-size-3xl);
  }

  h3 {
    font-size: var(--font-size-2xl);
  }

  .section {
    padding: var(--spacing-16) 0;
  }

  .hero {
    padding: var(--spacing-20) 0;
  }

  .hero__image {
    width: 220px;
    height: 220px;
  }

  .hero__title {
    font-size: var(--font-size-4xl);
  }

  .hero__subtitle {
    font-size: var(--font-size-xl);
  }

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

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

/* Desktop (992px and up) */
@media (min-width: 992px) {
  :root {
    --container-padding: var(--spacing-8);
  }

  /* Show desktop nav, hide mobile */
  .nav {
    display: block;
  }

  .menu-toggle {
    display: none;
  }

  .mobile-nav {
    display: none;
  }

  .hero__title {
    font-size: var(--font-size-5xl);
  }

  .cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Large Desktop (1200px and up) */
@media (min-width: 1200px) {
  .section {
    padding: var(--spacing-20) 0;
  }

  .hero {
    padding: var(--spacing-24) 0;
  }

  .cards--5 {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */
@media print {
  .header,
  .menu-toggle,
  .mobile-nav {
    display: none;
  }

  .main {
    padding-top: 0;
  }

  .hero {
    background: none;
    color: var(--color-text-dark);
    padding: var(--spacing-8) 0;
  }

  .hero__title,
  .hero__subtitle {
    color: var(--color-text-dark);
  }

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