/* --- Design System & Custom Properties --- */
:root {
  --font-serif: "Georgia", "Times New Roman", serif;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  --bg-color: #faf9f6;
  --text-color: #1a1917;
  --text-muted: #6e6b64;
  --accent-color: #c84b31;
  --accent-hover: #b03a22;
  --border-color: #e5e2db;
  --input-bg: #ffffff;
  --card-bg: #fcfbfa;
  --transition-speed: 0.3s;
  --container-width: 920px;
  --article-width: 700px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #121110;
    --text-color: #e8e6e3;
    --text-muted: #a6a29a;
    --accent-color: #e05e43;
    --accent-hover: #f07e66;
    --border-color: #2a2826;
    --input-bg: #1c1b1a;
    --card-bg: #181716;
  }
}

/* --- Resets & Base Styles --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-serif);
  font-size: 1.15rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition-speed), color var(--transition-speed);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--accent-color);
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  padding: 0.75rem 1rem;
  z-index: 20;
}

.skip-link:focus {
  top: 1rem;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-color);
  margin-bottom: 1.2rem;
}

h1 { font-size: 2.6rem; letter-spacing: -0.02em; }
h2 { font-size: 1.85rem; margin-top: 2.5rem; }
h3 { font-size: 1.4rem; }

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

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

p {
  margin-bottom: 1.6rem;
}

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.animate-slide-up {
  animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* --- Header & Navigation --- */
.site-header {
  border-bottom: 1px solid var(--border-color);
  padding: 2.5rem 0;
  margin-bottom: 3.5rem;
}

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

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.15rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-color);
}

.pixel-box {
  width: 10px;
  height: 10px;
  background-color: var(--accent-color);
  display: inline-block;
  transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.site-logo:hover .pixel-box {
  transform: rotate(90deg) scale(1.3);
}

.site-nav {
  display: flex;
  gap: 2.2rem;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.nav-link {
  color: var(--text-muted);
  position: relative;
  padding: 0.25rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--accent-color);
  transition: width var(--transition-speed) ease;
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link.active {
  color: var(--text-color);
}

/* --- Homepage Layout --- */
.intro-section {
  margin-bottom: 4rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid var(--border-color);
}

.intro-title {
  font-size: 3.2rem;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  max-width: 650px;
  letter-spacing: -0.03em;
}

@media (max-width: 768px) {
  .intro-title {
    font-size: 2.5rem;
  }
}

.intro-body {
  font-size: 1.3rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 780px;
}

.section-title {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.notes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 2.5rem;
  margin-bottom: 5rem;
}

.note-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.8rem;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  transition: transform var(--transition-speed), border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.note-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-color);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.02);
}

@media (prefers-color-scheme: dark) {
  .note-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  }
}

.note-meta {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.note-card-title {
  font-size: 1.35rem;
  margin-bottom: 1rem;
  line-height: 1.3;
}

.note-card-title a {
  color: var(--text-color);
}

.note-card-title a:hover {
  color: var(--accent-color);
}

.note-card-excerpt {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 1.8rem;
  flex-grow: 1;
  line-height: 1.6;
}

.read-more-link {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  padding-bottom: 2px;
}

.read-more-link:hover {
  border-bottom-color: var(--accent-hover);
}

/* --- Section Lists --- */
.notes-list-section {
  max-width: var(--article-width);
  margin: 0 auto;
}

.section-header {
  margin-bottom: 4rem;
}

.section-description {
  font-size: 1.25rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.notes-list-items {
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
  margin-bottom: 5rem;
}

.note-list-item {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 2.5rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid var(--border-color);
}

@media (max-width: 768px) {
  .note-list-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    padding-bottom: 2.5rem;
  }
}

.note-item-meta {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding-top: 0.35rem;
}

.note-item-title {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.note-item-title a {
  color: var(--text-color);
}

.note-item-title a:hover {
  color: var(--accent-color);
}

.note-item-excerpt {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  line-height: 1.65;
}

/* --- Single Article View --- */
.single-article {
  max-width: var(--article-width);
  margin: 0 auto 5rem auto;
}

.article-header {
  margin-bottom: 3.5rem;
  text-align: center;
}

.article-meta {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.article-title {
  font-size: 3rem;
  line-height: 1.15;
  margin-bottom: 0;
  letter-spacing: -0.02em;
}

@media (max-width: 768px) {
  .article-title {
    font-size: 2.2rem;
  }
}

.article-content {
  font-size: 1.15rem;
  line-height: 1.8;
}

.article-content p {
  margin-bottom: 1.8rem;
}

.article-content img {
  max-width: 100%;
  height: auto;
  margin: 2.5rem 0;
  border: 1px solid var(--border-color);
  border-radius: 2px;
  display: block;
}

.article-content h2 {
  font-size: 1.8rem;
  margin-top: 3.5rem;
  margin-bottom: 1.2rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.article-content h3 {
  font-size: 1.35rem;
  margin-top: 2.2rem;
  margin-bottom: 0.8rem;
}

.article-content hr {
  border: 0;
  height: 1px;
  background-color: var(--border-color);
  margin: 3rem 0;
}

.article-content ul, .article-content ol {
  margin-bottom: 1.8rem;
  padding-left: 1.8rem;
}

.article-content li {
  margin-bottom: 0.6rem;
}

.article-content strong {
  color: var(--text-color);
}

.article-content blockquote {
  border-left: 2px solid var(--accent-color);
  padding-left: 1.5rem;
  margin: 2.5rem 0;
  font-style: italic;
  color: var(--text-muted);
}

.article-footer {
  margin-top: 5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.back-link {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* --- Contact Form --- */
.contact-section {
  max-width: var(--article-width);
  margin: 0 auto 5rem auto;
}

.contact-form-container {
  margin-top: 2rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.8rem;
}

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
    gap: 1.8rem;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.form-group label {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea {
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.8rem 1rem;
  background-color: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  color: var(--text-color);
  transition: border-color var(--transition-speed), outline var(--transition-speed);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-color);
}

.form-actions {
  display: flex;
  justify-content: flex-start;
}

.submit-button {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background-color: var(--text-color);
  color: var(--bg-color);
  border: none;
  padding: 1rem 2.2rem;
  border-radius: 2px;
  cursor: pointer;
  transition: background-color var(--transition-speed), transform var(--transition-speed);
}

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

.submit-button:active {
  transform: translateY(0);
}

/* --- Footer --- */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

@media (max-width: 600px) {
  .footer-container {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

.tagline {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--text-muted);
}