/* Professor Town - Main Stylesheet */

/* ============================================
   CSS Variables
   ============================================ */
:root {
  --pt-oxford: #0B1F3B;
  --pt-teal: #0C7C59;
  --pt-gold: #C89B3C;
  --pt-ink: #1E293B;
  --pt-parch: #F7F3E8;
  --pt-slate-200: #E2E8F0;
  --pt-slate-50: #F8FAFC;
  --pt-white: #FFFFFF;
  --pt-black: #0B1220;
}

/* ============================================
   Font Faces
   ============================================ */
@font-face {
  font-family: 'Source Serif 4';
  src: url('../fonts/source-serif-4-bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Inter';
  src: url('../fonts/inter-regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Inter';
  src: url('../fonts/inter-medium.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Inter';
  src: url('../fonts/inter-semibold.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

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

html {
  font-size: 18px;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-weight: 400;
  line-height: 1.6;
  color: var(--pt-ink);
  background-color: var(--pt-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--pt-teal);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--pt-oxford);
}

a:focus {
  outline: 2px solid var(--pt-gold);
  outline-offset: 2px;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--pt-oxford);
  color: var(--pt-white);
  padding: 8px 16px;
  z-index: 100;
  border-radius: 0 0 4px 0;
}

.skip-link:focus {
  top: 0;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  font-weight: 700;
  line-height: 1.3;
  color: var(--pt-oxford);
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  line-height: 1.2;
}

h2 {
  font-size: clamp(2rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 1.75rem);
}

p {
  margin-bottom: 1rem;
}

small {
  font-size: clamp(0.875rem, 1vw, 1rem);
}

/* ============================================
   Layout
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.grid {
  display: grid;
  gap: 2rem;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .grid-12 {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  background: var(--pt-white);
  border-bottom: 1px solid var(--pt-slate-200);
  z-index: 50;
  padding: 1rem 0;
  transition: opacity 0.3s ease;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.nav-logo {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--pt-oxford);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  font-weight: 500;
  color: var(--pt-ink);
  padding: 0.5rem 0;
}

.nav-link:hover {
  color: var(--pt-teal);
}

.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--pt-oxford);
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--pt-white);
    flex-direction: column;
    padding: 2rem;
    border-top: 1px solid var(--pt-slate-200);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s;
  }
  
  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-mobile-toggle {
    display: block;
  }
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-weight: 600;
  font-size: 1rem;
  border-radius: 14px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease;
  border: none;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:focus {
  outline: 2px solid var(--pt-gold);
  outline-offset: 2px;
}

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

.btn-primary:hover {
  background: #0a1a30;
  color: var(--pt-white);
}

.btn-secondary {
  background: transparent;
  color: var(--pt-oxford);
  border: 2px solid var(--pt-oxford);
}

.btn-secondary:hover {
  background: var(--pt-teal);
  border-color: var(--pt-teal);
  color: var(--pt-white);
}

/* ============================================
   Cards
   ============================================ */
.card {
  background: var(--pt-white);
  border: 1px solid var(--pt-slate-200);
  border-radius: 14px;
  padding: 2rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.card-parch {
  background: var(--pt-parch);
}

/* ============================================
   Sections
   ============================================ */
.section {
  padding: 4rem 0;
}

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

.section-dark {
  background: var(--pt-oxford);
  color: var(--pt-white);
}

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

/* ============================================
   Hero
   ============================================ */
.hero {
  padding: 5rem 0 4rem;
  background: linear-gradient(to bottom, var(--pt-white), var(--pt-slate-50));
}

.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.trust-icons {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 3rem;
  flex-wrap: wrap;
  opacity: 0.6;
}

/* ============================================
   Animations
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.28s ease, transform 0.28s ease;
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

@keyframes zoom {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.02);
  }
}

.hero-image {
  animation: zoom 20s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .hero-image {
    animation: none;
  }
}

/* ============================================
   FAQ Accordion
   ============================================ */
.faq-item {
  border-bottom: 1px solid var(--pt-slate-200);
  padding: 1.5rem 0;
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--pt-oxford);
  cursor: pointer;
  padding: 0;
}

.faq-icon {
  transition: transform 0.3s ease;
  font-size: 1.5rem;
  color: var(--pt-teal);
}

.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding-top: 0;
}

.faq-answer.is-open {
  padding-top: 1rem;
}

/* ============================================
   Blog
   ============================================ */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.blog-card {
  display: flex;
  flex-direction: column;
}

.blog-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--pt-ink);
  opacity: 0.7;
  margin-bottom: 0.5rem;
}

.blog-category {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--pt-gold);
  color: var(--pt-oxford);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.blog-search {
  margin-bottom: 2rem;
}

.blog-search input {
  width: 100%;
  max-width: 500px;
  padding: 0.875rem 1rem;
  border: 2px solid var(--pt-slate-200);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.15s ease;
}

.blog-search input:focus {
  outline: none;
  border-color: var(--pt-teal);
}

.blog-filters {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.blog-filter-btn {
  padding: 0.5rem 1rem;
  background: var(--pt-white);
  border: 1px solid var(--pt-slate-200);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.blog-filter-btn:hover,
.blog-filter-btn.is-active {
  background: var(--pt-teal);
  color: var(--pt-white);
  border-color: var(--pt-teal);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--pt-black);
  color: var(--pt-white);
  padding: 3rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  color: var(--pt-white);
  margin-bottom: 1rem;
}

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

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--pt-slate-200);
}

.footer-links a:hover {
  color: var(--pt-gold);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.875rem;
  opacity: 0.7;
}

/* ============================================
   Utilities
   ============================================ */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
  }
  
  .section {
    padding: 3rem 0;
  }
  
  .container {
    padding: 0 1rem;
  }
}