:root {
  --bg-main: #f9f7f2; /* Cream/Off-white */
  --bg-secondary: #eceae5;
  --text-main: #2c2c2c; /* Graphite */
  --text-muted: #555555;
  --accent: #7d1f28; /* Muted Burgundy */
  --accent-hover: #5a151c;
  --border: #d1d1d1;

  --font-serif: "Georgia", "Times New Roman", serif;
  --font-sans: "Helvetica Neue", "Arial", sans-serif;

  --container-width: 1100px;
  --transition: 0.3s ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

/* Typography */
h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  color: var(--text-main);
}

h1 {
  font-size: 3.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.5rem;
}

h3 {
  font-size: 1.5rem;
}

p {
  margin-bottom: 1.5rem;
  color: var(--text-muted);
}

/* Layout Utilities */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

.bg-paper {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-dark {
  background-color: var(--text-main);
  color: var(--bg-main);
}

.section-dark h2,
.section-dark p,
.section-dark li {
  color: var(--bg-main);
}

.max-width-800 {
  max-width: 800px;
}

.border-top {
  border-top: 1px solid var(--border);
}

/* Header */
.header {
  padding: 25px 0;
  background-color: rgba(249, 247, 242, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: bold;
  color: var(--accent);
}

.logo img {
  height: 40px;
  width: auto;
}

.desktop-nav {
  display: flex;
  gap: 35px;
}

.desktop-nav a {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: relative;
  font-weight: 500;
}

.desktop-nav a::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent);
  transition: var(--transition);
}

.desktop-nav a:hover::after {
  width: 100%;
}

.burger-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 6px;
  width: 30px;
}

.line {
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  transition: var(--transition);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: var(--bg-main);
  z-index: 99;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 40px;
  transform: translateY(-100%);
  transition: transform 0.4s cubic-bezier(0.77, 0, 0.175, 1);
}

.mobile-menu.active {
  transform: translateY(0);
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 25px;
  text-align: center;
}

.mobile-nav a {
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--text-main);
}

/* Hero */
.hero {
  padding: 140px 0 100px;
  min-height: 80vh;
  display: flex;
  align-items: center;
  background-image: url("./images/5615256.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: #fff;
  text-align: center;
}

.hero__content {
  max-width: 800px;
}

.editorial-label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 20px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
  padding-bottom: 5px;
}

.abstract-line {
  width: 100px;
  height: 4px;
  background-color: var(--accent);
  margin-top: 40px;
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.image-container {
  border: 1px solid var(--border);
  padding: 10px;
  background: #fff;
}

/* Topics */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 50px;
}

.topic-card {
  background-color: var(--bg-main);
  padding: 30px;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.topic-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.num {
  display: block;
  font-family: var(--font-serif);
  font-size: 2rem;
  color: var(--border);
  margin-bottom: 15px;
}

/* Logic Schema */
.centered-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.logic-schema {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
  margin: 50px 0;
  width: 100%;
  max-width: 500px;
}

.schema-node {
  width: 100%;
  padding: 20px;
  border: 1px solid var(--text-main);
  background-color: #fff;
  font-weight: 500;
}

.schema-node.active {
  background-color: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.logic-desc {
  max-width: 600px;
  font-style: italic;
}

/* Errors & Articles */
.articles-list {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.article-item {
  border-left: 3px solid var(--accent);
  padding-left: 30px;
}

/* Cases */
.cases-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.case-card {
  background-color: #fff;
  border: 1px solid var(--border);
  padding: 40px;
  transition: var(--transition);
}

.case-card:hover {
  border-color: var(--accent);
}

.case-header {
  font-size: 0.8rem;
  text-transform: uppercase;
  color: #999;
  margin-bottom: 10px;
}

/* Lists */
.styled-list {
  list-style: none;
  margin-top: 20px;
}

.styled-list li {
  padding: 20px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 1.4rem;
  font-family: var(--font-serif);
}

/* FAQ */
.accordion {
  margin-top: 40px;
}

.acc-item {
  border-bottom: 1px solid var(--border);
}

.acc-head {
  padding: 25px 0;
  cursor: pointer;
  font-weight: 700;
  font-size: 1.1rem;
  transition: var(--transition);
}

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

.acc-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.acc-body p {
  padding-bottom: 25px;
  font-size: 1rem;
}

/* Form */
.form-wrapper {
  max-width: 600px;
  margin: 0 auto;
  background-color: #fff;
  padding: 50px;
  border: 1px solid var(--border);
}

.form-header {
  text-align: center;
  margin-bottom: 30px;
}

.input-group {
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
}

.input-group label {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-main);
}

.input-group input {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 0; /* Editorial style */
  font-family: var(--font-sans);
  font-size: 1rem;
  background-color: var(--bg-main);
  transition: border-color 0.3s;
}

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

.input-group input.error {
  border-color: red;
}

.checkbox-wrapper {
  display: flex;
  align-items: start;
  gap: 12px;
  margin-bottom: 30px;
}

.checkbox-wrapper input {
  margin-top: 5px;
}

.checkbox-wrapper label {
  font-size: 0.9rem;
  white-space: nowrap; /* PC Requirement */
  color: var(--text-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  white-space: wrap;
}

.checkbox-wrapper a {
  color: var(--accent);
  text-decoration: underline;
}

.btn-submit {
  width: 100%;
  padding: 15px;
  background-color: var(--text-main);
  color: #fff;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.btn-submit:hover {
  background-color: var(--accent);
}

.form-message {
  margin-top: 15px;
  text-align: center;
  font-weight: bold;
  color: var(--accent);
}

/* Footer */
.footer {
  background-color: var(--text-main);
  color: #fff;
  padding: 80px 0 40px;
  font-size: 0.9rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
}

.footer h4 {
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid #444;
  padding-bottom: 10px;
  display: inline-block;
}

.footer p,
.footer a {
  color: #ccc;
  margin-bottom: 10px;
}

.footer a {
  display: block;
}

.footer a:hover {
  color: #fff;
  text-decoration: underline;
}

.copyright {
  margin-top: 30px;
  font-size: 0.8rem;
  opacity: 0.5;
}

/* Cookie Pop-up */
.cookie-box {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 350px;
  background-color: #fff;
  border: 1px solid var(--accent);
  padding: 25px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  display: none; /* Hidden by default */
  flex-direction: column;
  gap: 15px;
}

.cookie-content p {
  margin-bottom: 0;
  font-size: 0.9rem;
}

.btn-cookie {
  align-self: flex-end;
  padding: 8px 20px;
  background-color: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 0.85rem;
  transition: var(--transition);
}

.btn-cookie:hover {
  background-color: var(--text-main);
}

/* Responsiveness */
@media (max-width: 900px) {
  .desktop-nav {
    display: none;
  }
  .burger-btn {
    display: flex;
  }

  h1 {
    font-size: 2.5rem;
  }
  h2 {
    font-size: 2rem;
  }

  .grid-2,
  .topics-grid,
  .cases-grid,
  .footer__grid {
    grid-template-columns: 1fr;
  }

  .checkbox-wrapper label {
    white-space: normal; /* Mobile wrap */
  }

  .section {
    padding: 60px 0;
  }
  .hero {
    padding: 120px 0 60px;
  }
}

.pages {
  padding: 120px 0;
}

.pages-wrap {
  max-width: 1000px;
  padding: 0 20px;
  margin: 0 auto 20px;
}

.pages h1 {
  font-size: 40px;
  font-weight: 900;
  color: var(--accent);
  margin-bottom: 40px;
  text-align: center;
}

.text-wrapper {
  background: #f8fafc;
  padding: 50px 40px;
  border-radius: 20px;
  line-height: 1.8;
}

.text-wrapper h2 {
  font-size: 28px;
  font-weight: 700;
  color: #1e293b;
  margin-top: 40px;
  margin-bottom: 15px;
  border-bottom: 2px solid rgba(99, 102, 241, 0.2);
  padding-bottom: 5px;
}

.text-wrapper h3 {
  color: #000000;
  margin-bottom: 20px;
}

.text-wrapper p {
  color: #64748b;
  margin-bottom: 20px;
}

.text-wrapper ul {
  list-style-type: none;
  padding-left: 0;
  margin-bottom: 20px;
}

.text-wrapper ul li {
  position: relative;
  padding-left: 25px;
  margin-bottom: 15px;
  color: #1e293b;
}

.text-wrapper ul li::before {
  content: "•";
  position: absolute;
  left: 0;
  font-size: 20px;
  line-height: 1;
  color: var(--primary);
  top: 0;
}

.text-wrapper strong {
  color: var(--color-error);
}

.text-wrapper a {
  color: #001eff;
  text-decoration: underline;
  font-weight: 600;
}

@media (max-width: 768px) {
  .pages {
    padding: 100px 0 60px;
  }
  .pages h1 {
    font-size: 28px;
    margin-bottom: 30px;
  }
  .text-wrapper {
    padding: 30px 20px;
  }
  .text-wrapper h2 {
    font-size: 24px;
    margin-top: 30px;
  }
}

.text-wrapper ol {
  display: flex;
  flex-direction: column;
  padding: 20px;
  color: #000000;
}

.margin {
  margin: 120px 0 50px;
}