/* ------------------------------
   font
------------------------------ */
@import url('https://fonts.googleapis.com/css2?family=Racing+Sans+One&family=Roboto:wght@400;700&display=swap');

/* --------------------------------
   whole page style
---------------------------------- */
:root {
  --primary-color: #08F7FE; 
  --heading-color: #ffffff;
  --text-color: #cdd3df;
  --bg-gradient-start: #0b0e13;
  --bg-gradient-end: #1c2028;
  --glass-bg: rgba(255, 255, 255, 0.08);
  --navbar-bg: rgba(255, 255, 255, 0.08);
  --frosted-blur: blur(10px);
}

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

/* ------------------------------
   Body style
------------------------------ */
body {
  font-family: 'Roboto', sans-serif;
  background: #0b0e13;
  color: var(--text-color);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ------------------------------
   Navbar
------------------------------ */

header.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 2rem;

  background: var(--navbar-bg);
  backdrop-filter: var(--frosted-blur); 
  -webkit-backdrop-filter: var(--frosted-blur); 

  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);

}


.nav-group {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
}

.nav-group a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  font-size: 1rem;
  padding: 0.5rem 1rem;
  margin-right: 2rem;
  border-radius: 12px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-right {
  margin-left: auto;
  display: flex;
  gap: 2rem;
}

.nav-group a:hover,
.nav-group a:active {
  background: var(--primary-color);
  color: #000; 
}


/* ------------------------------
   branding page
------------------------------ */
.first-section {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem 5%;
  gap: 3rem;
  flex-wrap: wrap;
  margin-top: 80px;
}

.image-box img {
  max-width: 450px;
  border-radius: 15px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.text-box {
  max-width: 600px;
}

.product-name {
  font-family: 'Racing Sans One', sans-serif;
  font-size: 4rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.tagline {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--heading-color);
}

.description {
  font-size: 1rem;
  line-height: 1.7;
}

/* ------------------------------
   client section
------------------------------ */
.second-section {
  width: 100%;
  padding: 2rem 0;
}

.basic-info {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  background: var(--glass-bg);
  backdrop-filter: var(--frosted-blur);
  -webkit-backdrop-filter: var(--frosted-blur);
  border-radius: 15px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 2rem;
}

.info-item {
  flex: 1 1 200px;
  text-align: center;
  min-width: 150px;
}

.info-item h3 {
  margin-bottom: 0.5rem;
  color: var(--primary-color);
  font-size: 1.1rem;
  font-weight: 600;
}

.info-item p {
  color: var(--heading-color);
  font-style: italic;
}

/* ------------------------------
   client information
------------------------------ */
.client-section {
  padding: 4rem 2rem;
  text-align: center;
}

.client-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.section-subtitle {
  color: var(--primary-color);
  font-size: 2rem;
  font-weight: 700;
}

.client-logo {
  max-width: 300px;
}

.client-logo img {
  width: 100%;
  display: block;
}

.vision-section {
   padding: 3rem 2rem; 
  
}

.vision-content {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--glass-bg);
  backdrop-filter: var(--frosted-blur);
  -webkit-backdrop-filter: var(--frosted-blur);
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  padding: 4rem;
}

.vision-title {
  color: var(--heading-color);
  font-size: 2rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

.vision-description {
  color: var(--text-color);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 2rem;
}

.highlight {
  color: var(--primary-color);
  font-weight: 500;
}

.client-requirements {
  margin-top: 1.5rem;
  color: var(--text-color);
}

.requirements-title {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: var(--heading-color);
  font-style: italic;
}

.requirements-list {
  list-style-type: none;
  padding: 0;
  margin-left: 1rem;
}

.requirements-list li {
  margin-bottom: 0.75rem;
  position: relative;
  line-height: 1.5;
}

.requirements-list li::before {
  content: "•";
  color: var(--primary-color);
  margin-right: 0.5rem;
  position: absolute;
  left: -1rem;
}

/* ------------------------------
   problem space
------------------------------ */
.problem-space {
  text-align: center;
  padding: 3rem 1rem;
  max-width: 800px;
  margin: 0 auto;
}

.problem-space h3 {
  color: var(--text-color);
  font-size: 1rem;
  margin-bottom: 1rem;
  font-weight: 500;
}

.problem-statement {
  color: var(--primary-color);
  font-size: 1.7rem;
  line-height: 1.4;
  font-weight: 700;
  font-style: italic;
}

/* ------------------------------
   user research
------------------------------ */
/* Research Section */
.research-section {
  padding: 3rem 2rem;
}

.research-content {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--glass-bg);
  backdrop-filter: var(--frosted-blur);
  -webkit-backdrop-filter: var(--frosted-blur);
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  padding: 4rem;
}

/* Determine Section */
.determine-title {
  color: var(--heading-color);
  font-size: 2rem;
  margin-bottom: 1rem;
  
}

.determine-text p {
  font-size: 1rem;
  line-height: 1.7;
}

/* Research Title */
.research-title {
  color: var(--heading-color);
  font-size: 1.5rem;
  margin-bottom: 1rem;
  font-style: italic;
  margin-top: 3rem;
}

.research-text p {
  margin-bottom: 1rem;
  font-size: 1rem;
  line-height: 1.7;
}

/* Persona Section */
.persona-section {
  margin-top: 2rem;
}

.persona-image {
  width: 100%;
  margin-bottom: 2rem;
}

.persona-image img {
  width: 100%;
  max-width: 800px;
  display: block;
  margin: 0 auto;
  border-radius: 15px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.persona-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.persona-column h3 {
  color: var(--primary-color);
  font-size: 1.3rem;
  margin-bottom: 0.1rem;
  font-weight: 600;
  padding-left: 2rem;
}

.persona-column:last-child h3 {
  padding-left: 2rem;
}

.persona-list {
  list-style: none;
  padding: 1rem 3rem;
}

.persona-list li {
  margin-bottom: 0.75rem;
  position: relative;
  line-height: 1.5;
  color: var(--text-color);
}

.persona-list li::before {
  content: "•";
  color: var(--primary-color);
  margin-right: 0.5rem;
  position: absolute;
  left: -1rem;
}

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

/* Storyboard */
.storyboard-section {
  margin-top: 2rem;
}

.storyboard-image img {
  width: 100%;
  max-width: 800px;
  display: block;
  margin: 0 auto;
  border-radius: 15px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}


/* ------------------------------
   wireframe (lo-fi)
------------------------------ */
.wireframes-showcase {
  padding: 3rem 2rem;
}

.wireframes-content {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--glass-bg);
  backdrop-filter: var(--frosted-blur);
  -webkit-backdrop-filter: var(--frosted-blur);
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  padding: 4rem;
}

.wireframes-title {
  color: var(--heading-color);
  font-size: 2rem;
  margin-bottom: 1rem;
}

.wireframes-description {
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 2rem;
}

.wireframes-grid {
  margin-top: 2rem;
}

.wireframe-item img {
  width: 100%;
  max-width: 800px;
  display: block;
  margin: 0 auto;
  border-radius: 15px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

/* ------------------------------
   Feedback Section
------------------------------ */
.feedback-section {
  padding: 3rem 2rem;
}

.feedback-content {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--glass-bg);
  backdrop-filter: var(--frosted-blur);
  -webkit-backdrop-filter: var(--frosted-blur);
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  padding: 3rem 3rem 2rem 3rem;
}

.feedback-title {
  color: var(--heading-color);
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

.feedback-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feedback-column h3 {
  color: var(--primary-color);
  font-size: 1.1rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

.feedback-list {
  list-style: none;
  padding: 0;
}

.feedback-list li {
  margin-bottom: 0.75rem;
  position: relative;
  line-height: 1.5;
  color: var(--text-color);
  padding-left: 1rem;
}

.feedback-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--primary-color);
}

.feedback-negative {
  color: #ff5555 !important;
}

.feedback-positive {
  color: #33ff99 !important;
}

@media (max-width: 992px) {
  .feedback-grid {
    grid-template-columns: 1fr;
  }
}

/* ------------------------------
   mid-fi
------------------------------ */
.mid-fi-showcase {
  padding: 3rem 2rem;
}

.mid-fi-content {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--glass-bg);
  backdrop-filter: var(--frosted-blur);
  -webkit-backdrop-filter: var(--frosted-blur);
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  padding: 4rem;
  text-align: left;
}

.mid-fi-title {
  color: var(--heading-color);
  font-size: 2rem;
  margin-bottom: 1rem;
}

.mid-fi-description {
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 2rem;
}

.mid-fi-grid {
  margin-top: 2rem;
}

.mid-fi-item {
  background: transparent;
  padding: 0;
}

.mid-fi-item img {
  width: 100%;
  max-width: 800px;
  display: block;
  margin: 0 auto;
  border-radius: 15px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

/* ------------------------------
   high-fi
------------------------------ */
.final-iteration-section {
  margin-top: 2.5rem;
  padding: 4rem 2rem;
}

.final-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.final-header {
  text-align: center;
  margin-bottom: 3rem;
}

.final-title {
  color: var(--heading-color);
  font-size: 2rem;
  margin-bottom: 2rem;
}

.pendant-title {
  font-family: 'Racing Sans One', sans-serif;
  color: var(--primary-color);
  
}

.final-description {
  font-size: 1rem;
  color: var(--text-color);
  line-height: 1.6;
  max-width: 1200px;
  margin: 0 auto 3rem auto;
  padding: 0 2rem;
}

/* product images */
.product-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin: 3rem auto;
  max-width: 900px;
}

.image-card {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
  background: var(--glass-bg);
  backdrop-filter: var(--frosted-blur);
  -webkit-backdrop-filter: var(--frosted-blur);
  padding: 1rem;
  transition: transform 0.3s ease;
  display: flex;
  justify-content: center;
  align-items: center;
}

.image-card:hover {
  transform: translateY(-5px);
}

.image-card img {
  width: 100%;
  max-width: 400px;
  border-radius: 10px;
}

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

/* Haptic kit */
.haptic-section {
  padding: 2rem 2rem 5rem;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

  .haptic-title {
  color: var(--heading-color);
  font-size: 2rem;
  margin-bottom: 2rem;
  text-align: center;
}

.haptic-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.haptic-text {
  line-height: 1.6;
}

.haptic-text p {
  margin-bottom: 1rem;
}

.haptic-images {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.haptic-images .image-card img {
  max-width: 600px;
  margin: 0 0;
}

@media (max-width: 992px) {
  .haptic-content {
    grid-template-columns: 1fr;
  }
}

/* ------------------------------
   App Interface
------------------------------ */
.app-interface-section {
  padding: 4rem 2rem;
  background-color: rgba(0, 0, 0, 0.3);
}

.interface-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.interface-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.interface-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.5rem;
  background: var(--glass-bg);
  backdrop-filter: var(--frosted-blur);
  -webkit-backdrop-filter: var(--frosted-blur);
  border-radius: 15px;
  padding: 3rem 2rem;
  transition: transform 0.3s ease;
}

.interface-item:hover {
  transform: translateY(-5px);
}

.interface-image {
  margin-bottom: 1rem;
}

.interface-image img {
  max-width: 250px;
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.interface-item h3 {
  font-size: 1.2rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.interface-item p {
  font-size: 0.9rem;
  color: var(--text-color);
  line-height: 1.4;
  max-width: 300px;
  margin: 0 auto;
}

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

.slide-in {
  opacity: 0;
  transform: translateY(100px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.slide-in-visible {
  opacity: 1;
  transform: translateY(0);
}
/* ------------------------------
   footer
------------------------------ */
.footer-section {
  padding: 3rem 2rem;
  background-color: rgba(0, 0, 0, 0.3);
}

.footer-title {
  color: var(--heading-color);
  font-size: 1.8rem;
  margin-bottom: 2rem;
  text-align: center;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--glass-bg);
  backdrop-filter: var(--frosted-blur);
  -webkit-backdrop-filter: var(--frosted-blur);
  border-radius: 15px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  padding: 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.footer-card {
  text-align: center;
}

.footer-card h3 {
  color: var(--primary-color);
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.footer-card a {
  color: var(--text-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

/* 响应式布局 */
@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.interface-main-title {
  color: var(--heading-color);
  font-size: 2rem;
  margin-bottom: 3rem;
  text-align: center;
}

.interface-description {
  max-width: 1200px;
  margin: 0 auto 3rem auto;
  padding: 0 2rem;
  text-align: left;
}

.interface-description p {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-color);
  margin-bottom: 1.5rem;
}