/* ===============================
Global Styles
=============================== */
:root {
--primary-color: #87CEEB; 
--background-color: #000000;
--text-color: #FFFFFF;
--font-family-primary: 'Arial', sans-serif;
}

body {
  margin: 0;
  font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  background-color: #ffffff;
  color: #000000;
  line-height: 1.4;
}

a {
color: inherit;
text-decoration: none; 
transition: color .3s;
}

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

/* Header */
.navbar {
position: sticky;
top: 0;
z-index: 1000;
display: flex;
justify-content: space-between;
align-items: center;
padding: 20px 50px;
background: #fff;
color: #000;
border-bottom: 1px solid rgba(0, 0, 0, .08);
}

.logo {
font-size: 24px;
font-weight: bold;
color: #000;
}

.navbar a {
color: #000;
}

.navbar a:hover {
color: var(--primary-color);
}

.nav-links {
display: flex;
align-items: center;
gap: 25px;
transition: all 0.3s ease;
}

.nav-links a {
padding: 8px 0;
}

.contact-button {
border: 1px solid #000;
color: #000;
padding: 10px 20px;
}

.contact-button:hover {
border-color: var(--primary-color);
color: var(--primary-color);
}

.hamburger {
display: none;
background: none;
border: 0;
padding: 6px;
cursor: pointer;
}

.hamburger span {
display: block;
width: 26px;
height: 2px;
background: #000;
margin: 6px 0;
transition: transform .25s ease, opacity .25s ease;
}

.navbar.open .hamburger span:nth-child(1) {
transform: translateY(8px) rotate(45deg);
}

.navbar.open .hamburger span:nth-child(2) {
opacity: 0;
}

.navbar.open .hamburger span:nth-child(3) {
transform: translateY(-8px) rotate(-45deg);
}

/* ===============================
Header Section
=============================== */
.case-study-header {
text-align: center;
padding: 100px 0 40px;
background-color: #ffffff;
}

.case-study-header h1 {
font-size: 2.8em;
font-weight: 800;
margin-bottom: 10px;
}

.case-study-header p {
color: #6fa3ef;
font-weight: 600;
font-size: 1.1em;
letter-spacing: 1px;
}

/* ===============================
Main Content
=============================== */
.case-study-content {
max-width: 900px;
margin: 0 auto;
padding: 0 4vw;
}

.content-section h2 {
font-size: 1.8em;
font-weight: 700;
color: #6fa3ef;
margin-top: 80px;
border-bottom: 2px solid #6fa3ef;
padding-bottom: 5px;
}

.content-section h3 {
font-size: 1.2em;
color: #000000;
margin-top: 40px;
}

.content-section h4 {
font-size: 1.2em;
color: #000000;
margin-top: 40px;
font-weight: 400;
}

p {
color: #000000;
font-size: 1.05em;
margin-bottom: 20px;
}

/* Highlight Box */
.section-box {
background-color: #6fa3ef;
color: #ffffff;
padding: 30px;
border-radius: 12px;
margin: 40px 0;
}

.section-box h3 {
color: #ffffff;
margin-top: 0;
font-size: 1.3em;
}

/* Lists */
ol, ul {
padding-left: 20px;
color: #000000;
}

ul li, ol li {
margin-bottom: 6px;
font-size: 1em;
}

/* Images */
img {
display: block;
margin: 40px auto;
max-width: 100%;
height: auto;
}

/* Typography */
h1, h2, h3 {
line-height: 1.3;
letter-spacing: 0.3px;
}

strong, b {
color: #000000;
}

em {
color: #6fa3ef;
}

.case-intro {
max-width: 900px;
margin: 0 auto 60px;
padding: 0 4vw;
text-align: left;
font-size: 1.05em;
}

.case-intro p {
margin-bottom: 8px;
color: #000000;
line-height: 1.6;
}

/* Research Results Grid */
.research-results-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 60px 20px;
text-align: center;
margin-top: 50px;
padding: 0 50px;
}

.finding {
display: flex;
flex-direction: column;
align-items: center;
justify-content: flex-start;
}

.finding h3 {
margin: 15px 0 5px 0; 
font-size: 1.3em;
font-weight: 700;
}

.finding p {
color: #000000;
font-size: 1em;
line-height: 1.4;
margin-bottom: 0;
}

.finding i {
 font-size: 2.5rem;
}

/* ===============================
Persona Section
=============================== */

.persona-section {
  margin-top: 80px;
}

.persona-header {
  display: flex;
  align-items: flex-start;
  gap: 60px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.persona-image-wrapper {
  background-color: #6fa3ef;
  border-radius: 32px;
  padding: 24px 24px 0;
  max-width: 280px;
  flex: 0 0 auto;
}

.persona-image-wrapper img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  margin-bottom: 0;
}

.persona-summary {
  flex: 1 1 280px;
}

.persona-tag {
  text-transform: none;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #6fa3ef;
  margin: 0 0 8px;
}

.persona-name {
  font-size: 2rem;
  font-weight: 800;
  margin: 0 0 8px;
}

.persona-meta {
  margin: 0 0 32px;
  font-size: 1.05em;
}

.persona-apps-title {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #6fa3ef;
  margin-top: 0;
  margin-bottom: 16px;
}

.persona-apps {
  display: flex;
  align-items: center;
  gap: 24px;
}

.persona-apps img {
  height: 48px;
  width: auto;
  display: block;
}

.persona-bio-card {
  background-color: #6fa3ef;
  border-radius: 32px;
  padding: 40px 40px 32px;
  margin-top: 60px;
}

.persona-bio-card h3 {
  color: #FFFFFF;
  margin-top: 0;
  margin-bottom: 20px;
}

.persona-bio-card h4 {
  color: #FFFFFF;
  font-weight: 700;
  margin-top: 32px;
  margin-bottom: 12px;
}

.persona-bio-card p,
.persona-bio-card li {
  font-size: 1.02em;
}

.persona-bio-card ul {
  margin: 0;
  padding-left: 20px;
}

@media (max-width: 768px) {
  .persona-header {
    gap: 24px;
  }

  .persona-image-wrapper {
    max-width: 100%;
    margin: 0 auto;
  }

  .persona-summary {
    flex: 1 1 100%;
  }

  .persona-name {
    font-size: 1.6rem;
  }

  .persona-bio-card {
    padding: 30px 20px 24px;
  }
}