/* 
============================
PATRICK SHAO - PORTFOLIO
============================
Main Stylesheet
*/

/* 
============================
CSS VARIABLES & RESET
============================
*/
:root {
  /* Color Palette */
  --primary-color: #4e54c8;
  --primary-light: #6c63ff;
  --primary-dark: #3f3d9e;
  --secondary-color: #ff7d3b;
  --secondary-light: #ff9b69;
  --secondary-dark: #e66a2d;
  --accent-color: #2cc0a0;

  /* Dark/Light Mode Colors */
  --bg-color: #ffffff;
  --bg-secondary: #f9f9f9;
  --text-color: #333333;
  --text-light: #777777;
  --border-color: rgba(0, 0, 0, 0.1);
  --card-bg: #ffffff;
  --shadow-color: rgba(0, 0, 0, 0.08);

  /* Typography */
  --font-heading: "Poppins", sans-serif;
  --font-body: "Inter", sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 8rem;

  /* Borders & Shadows */
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 1rem;
  --border-radius-xl: 2rem;
  --border-radius-full: 50%;

  --box-shadow: 0 10px 30px var(--shadow-color);
  --box-shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.12);

  /* Animation */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Dark Mode */
body.dark-mode {
  --bg-color: #121212;
  --bg-secondary: #1e1e1e;
  --text-color: #f0f0f0;
  --text-light: #bbbbbb;
  --border-color: rgba(255, 255, 255, 0.1);
  --card-bg: #1e1e1e;
  --shadow-color: rgba(0, 0, 0, 0.2);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal),
    color var(--transition-normal);
}

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

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

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

ul,
ol {
  list-style-position: inside;
}

button {
  cursor: pointer;
  font-family: var(--font-body);
  border: none;
  background: none;
}

input,
textarea,
select {
  font-family: var(--font-body);
  font-size: 1rem;
}

/* 
============================
UTILITY CLASSES
============================
*/
.highlight {
  color: var(--secondary-color);
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.slide-in-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.slide-in-right {
  opacity: 0;
  transform: translateX(50px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.slide-in-left.active,
.slide-in-right.active {
  opacity: 1;
  transform: translateX(0);
}

.ripple {
  position: relative;
  overflow: hidden;
}

.ripple::after {
  content: "";
  position: absolute;
  width: 5px;
  height: 5px;
  background: rgba(255, 255, 255, 0.5);
  display: block;
  border-radius: 50%;
  opacity: 0.6;
  transform: scale(0);
}

/* 
============================
THEME TOGGLE
============================
*/
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  margin-top: 50px;
  z-index: 1000;
}

.theme-toggle button {
  background-color: var(--card-bg);
  color: var(--text-color);
  border-radius: var(--border-radius-full);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--box-shadow);
  transition: var(--transition-normal);
}

.theme-toggle button:hover {
  transform: translateY(-3px);
  box-shadow: var(--box-shadow-hover);
}

body:not(.dark-mode) .moon-icon {
  display: block;
}

body:not(.dark-mode) .sun-icon {
  display: none;
}

body.dark-mode .moon-icon {
  display: none;
}

body.dark-mode .sun-icon {
  display: block;
}

/* 
============================
ANIMATED SHAPES
============================
*/
.shape-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.shape {
  position: absolute;
  background: linear-gradient(
    45deg,
    var(--primary-light),
    var(--primary-color)
  );
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.08;
  animation: float 20s infinite ease-in-out;
}

.shape-1 {
  width: 300px;
  height: 300px;
  top: -150px;
  left: -150px;
  animation-delay: 0s;
}

.shape-2 {
  width: 400px;
  height: 400px;
  top: 70%;
  right: -200px;
  animation-delay: -5s;
}

.shape-3 {
  width: 200px;
  height: 200px;
  bottom: -100px;
  left: 30%;
  animation-delay: -10s;
}

.shape-4 {
  width: 250px;
  height: 250px;
  top: 30%;
  left: 70%;
  animation-delay: -15s;
}

@keyframes float {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  25% {
    transform: translate(10px, 30px) rotate(5deg);
  }
  50% {
    transform: translate(20px, -20px) rotate(10deg);
  }
  75% {
    transform: translate(-10px, 40px) rotate(5deg);
  }
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
}

/* 
============================
NAVIGATION
============================
*/
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transform: translateZ(0);
  transition: var(--transition-normal);
}

.dark-mode .main-nav {
  background-color: rgba(18, 18, 18, 0.95);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  font-family: var(--font-heading);
  color: var(--primary-color);
  background: linear-gradient(
    45deg,
    var(--primary-color),
    var(--secondary-color)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  list-style: none;
}

.nav-links li {
  margin-left: 2rem;
  position: relative;
}

.nav-links li a {
  color: var(--text-color);
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
}

.nav-links li a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(
    to right,
    var(--primary-color),
    var(--secondary-color)
  );
  transition: width var(--transition-normal);
}

.nav-links li a:hover::after,
.nav-links li.active a::after {
  width: 100%;
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 20px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

.hamburger span {
  width: 100%;
  height: 2px;
  background-color: var(--text-color);
  transition: var(--transition-normal);
}

/* 
============================
MAIN CONTENT LAYOUT
============================
*/
main {
  padding-top: 80px;
  min-height: calc(100vh - 300px);
}

section {
  padding: var(--spacing-lg) var(--spacing-md);
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.section-header h1,
.section-header h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  position: relative;
  display: inline-block;
}

.section-header h1 {
  font-size: 3rem;
}

.section-header h2 {
  font-size: 2.5rem;
}

.section-header p {
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* 
============================
HERO SECTION
============================
*/
.hero {
  padding: var(--spacing-lg) var(--spacing-md);
  max-width: 1200px;
  margin: 0 auto;
  min-height: calc(100vh - 80px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.greeting-container {
  margin-bottom: var(--spacing-md);
}

.hero-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
}

.hero-text {
  flex: 1;
}

.hero-text h1 {
  font-family: var(--font-heading);
  font-size: 4rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(
    45deg,
    var(--primary-color),
    var(--secondary-color)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.typewriter-container {
  height: 50px;
  margin-bottom: var(--spacing-md);
}

.typewriter {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 600;
  color: var(--text-color);
  border-right: 0.1em solid var(--secondary-color);
  white-space: nowrap;
  overflow: hidden;
  animation: blink-caret 0.75s step-end infinite;
}

@keyframes blink-caret {
  from,
  to {
    border-color: transparent;
  }
  50% {
    border-color: var(--secondary-color);
  }
}

.hero-description {
  font-size: 1.2rem;
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.image-container {
  width: 350px;
  height: 350px;
  position: relative;
  border-radius: var(--border-radius-full);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transform: rotate(5deg);
  transition: transform var(--transition-normal);
}

.image-container:hover {
  transform: rotate(0deg) scale(1.05);
}

.image-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cta-container {
  margin-top: var(--spacing-md);
}

.cta-button {
  display: inline-block;
  background: linear-gradient(
    45deg,
    var(--primary-color),
    var(--primary-light)
  );
  color: white;
  font-weight: 600;
  padding: 1rem 2rem;
  border-radius: var(--border-radius-md);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: transform var(--transition-normal),
    box-shadow var(--transition-normal);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.cta-button:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  color: white;
}

.cta-button::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    45deg,
    var(--secondary-color),
    var(--secondary-light)
  );
  opacity: 0;
  z-index: -1;
  transition: opacity var(--transition-normal);
}

.cta-button:hover::before {
  opacity: 1;
}

/* 
============================
INTRO SECTION
============================
*/
.intro {
  text-align: center;
}

.intro-content {
  max-width: 800px;
  margin: 0 auto;
}

.intro-content p {
  font-size: 1.2rem;
  line-height: 1.8;
}

/* 
============================
SKILLS PREVIEW
============================
*/
.skills-preview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.skill-card {
  background-color: var(--card-bg);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--box-shadow);
  transition: transform var(--transition-normal),
    box-shadow var(--transition-normal);
  position: relative;
  z-index: 1;
  overflow: hidden;
}

.skill-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    45deg,
    var(--primary-color),
    var(--primary-light)
  );
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.skill-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--box-shadow-hover);
  color: white;
}

.skill-card:hover::before {
  opacity: 1;
}

.skill-icon {
  width: 60px;
  height: 60px;
  background-color: rgba(78, 84, 200, 0.1);
  border-radius: var(--border-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-color);
  transition: background-color var(--transition-normal),
    color var(--transition-normal);
}

.skill-card:hover .skill-icon {
  background-color: rgba(255, 255, 255, 0.2);
  color: white;
}

.skill-card h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  transition: color var(--transition-normal);
}

.skill-card p {
  color: var(--text-light);
  transition: color var(--transition-normal);
}

.skill-card:hover p {
  color: rgba(255, 255, 255, 0.8);
}

/* 
============================
PROJECT PREVIEW
============================
*/
.project-preview {
  margin-top: var(--spacing-xl);
}

.featured-project {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.project-image {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  position: relative;
}

.project-image img {
  width: 100%;
  height: auto;
  transition: transform var(--transition-normal);
}

.project-image:hover img {
  transform: scale(1.05);
}

.project-info h3 {
  font-family: var(--font-heading);
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.project-info p {
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
}

.project-link {
  display: inline-flex;
  align-items: center;
  font-weight: 600;
  color: var(--primary-color);
  transition: color var(--transition-normal);
}

.project-link span {
  margin-left: 0.5rem;
  transition: transform var(--transition-normal);
}

.project-link:hover {
  color: var(--secondary-color);
}

.project-link:hover span {
  transform: translateX(5px);
}

/* 
============================
ABOUT PAGE
============================
*/
.about-hero {
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

.profile-image {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--box-shadow);
}

.about-text h2 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.about-text h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-sm);
}

.about-text p {
  margin-bottom: var(--spacing-md);
}

.skills-section,
.education-section {
  margin-top: var(--spacing-md);
}

.skills-section h3,
.education-section h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-color);
}

.skills-list {
  list-style: none;
}

.skills-list > li {
  margin-bottom: var(--spacing-sm);
}

.skills-list h4 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
}

.skills-list ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skills-list ul li {
  background-color: rgba(78, 84, 200, 0.1);
  color: var(--primary-color);
  padding: 0.25rem 0.75rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.9rem;
  transition: var(--transition-normal);
}

.skills-list ul li:hover {
  background-color: var(--primary-color);
  color: white;
}

.education-item h4 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.education-item p {
  margin-bottom: 0.25rem;
  color: var(--text-light);
}

.location-section {
  margin-top: var(--spacing-xl);
}

.map-container {
  position: relative;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  height: 450px;
  box-shadow: var(--box-shadow);
}

.map-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: var(--spacing-md);
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  color: white;
}

.location-info h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

/* 
============================
PORTFOLIO PAGE
============================
*/
.portfolio-hero {
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
}

.projects-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.project-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
  background-color: var(--card-bg);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  padding: var(--spacing-md);
}

.project-card:nth-child(even) {
  direction: rtl;
}

.project-card:nth-child(even) .project-info {
  direction: ltr;
}

.project-card .project-image {
  height: 100%;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
}

.project-card .project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.project-card .project-image:hover img {
  transform: scale(1.05);
}

.project-info h2 {
  font-family: var(--font-heading);
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.project-type {
  color: var(--secondary-color);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.project-description {
  color: var(--text-light);
  margin-bottom: var(--spacing-sm);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: var(--spacing-sm);
}

.project-tech span {
  background-color: rgba(78, 84, 200, 0.1);
  color: var(--primary-color);
  padding: 0.25rem 0.75rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.9rem;
  transition: var(--transition-normal);
}

.project-tech span:hover {
  background-color: var(--primary-color);
  color: white;
}

.show-details-btn {
  background-color: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  transition: var(--transition-normal);
  margin-top: var(--spacing-sm);
}

.show-details-btn:hover {
  background-color: var(--primary-color);
  color: white;
}

.project-details {
  display: none;
  margin-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-md);
}

.details-section {
  margin-bottom: var(--spacing-md);
}

.details-section h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
}

.details-section p {
  margin-bottom: 0.5rem;
}

.details-section ul {
  list-style-type: disc;
  margin-left: 1.5rem;
  margin-bottom: 0.5rem;
}

.visit-site-btn {
  display: inline-block;
  background: linear-gradient(
    45deg,
    var(--primary-color),
    var(--primary-light)
  );
  color: white;
  font-weight: 600;
  padding: 0.5rem 1.5rem;
  border-radius: var(--border-radius-md);
  margin-top: var(--spacing-sm);
  transition: transform var(--transition-normal),
    box-shadow var(--transition-normal);
}

.visit-site-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  color: white;
}

/* 
============================
CONTACT PAGE
============================
*/
.contact-hero {
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

.contact-info h2 {
  font-family: var(--font-heading);
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.contact-info p {
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
}

.contact-details {
  margin-top: var(--spacing-lg);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
}

.contact-icon {
  background-color: rgba(78, 84, 200, 0.1);
  color: var(--primary-color);
  width: 50px;
  height: 50px;
  border-radius: var(--border-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: var(--spacing-sm);
  flex-shrink: 0;
}

.contact-text h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  margin-bottom: 0.25rem;
}

.social-mini {
  display: flex;
  gap: 1rem;
}

.social-mini a {
  color: var(--primary-color);
  transition: color var(--transition-normal), transform var(--transition-normal);
}

.social-mini a:hover {
  color: var(--secondary-color);
  transform: translateY(-3px);
}

.contact-form-container {
  background-color: var(--card-bg);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--box-shadow);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

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

.form-group label {
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.required {
  color: #e74c3c;
}

input,
textarea,
select {
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-body);
  transition: border-color var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary-color);
}

.radio-group,
.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}

.radio-option,
.checkbox-option {
  display: flex;
  align-items: center;
}

.radio-option input,
.checkbox-option input {
  margin-right: 0.5rem;
}

.validation-feedback {
  font-size: 0.85rem;
  margin-top: 0.25rem;
  height: 20px;
}

.valid-feedback {
  color: #2ecc71;
}

.invalid-feedback {
  color: #e74c3c;
}

.submit-btn {
  background: linear-gradient(
    45deg,
    var(--primary-color),
    var(--primary-light)
  );
  color: white;
  font-weight: 600;
  padding: 1rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: transform var(--transition-normal),
    box-shadow var(--transition-normal);
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.submit-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.btn-text {
  transition: opacity var(--transition-normal);
}

.loading-spinner {
  position: absolute;
  width: 24px;
  height: 24px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 1s linear infinite;
  display: none;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.submit-btn.loading .btn-text {
  opacity: 0;
}

.submit-btn.loading .loading-spinner {
  display: block;
}

/* 
============================
SURVEY PAGE
============================
*/
.survey-hero {
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
}

.survey-content {
  max-width: 800px;
  margin: 0 auto;
}

.survey-intro {
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.survey-intro h2 {
  font-family: var(--font-heading);
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.survey-form {
  background-color: var(--card-bg);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--box-shadow);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.rating-item {
  margin-top: var(--spacing-sm);
}

.rating-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.rating-options {
  display: flex;
  justify-content: space-between;
  margin: 0.5rem 0;
}

.rating-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 40px;
}

.rating-option input[type="radio"] {
  margin: 0;
}

.rating-option label {
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

.rating-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-light);
}

/* 
============================
CALL TO ACTION SECTION
============================
*/
.cta-section {
  text-align: center;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  background-color: var(--card-bg);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--box-shadow);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(
    to right,
    var(--primary-color),
    var(--secondary-color)
  );
}

.cta-section h2 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.cta-section p {
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
  font-size: 1.2rem;
}

/* 
============================
FOOTER
============================
*/
footer {
  background-color: var(--bg-secondary);
  padding: var(--spacing-lg) var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-lg);
}

.footer-logo h3 {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.footer-logo p {
  color: var(--text-light);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
}

.footer-section h4 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  margin-bottom: var(--spacing-sm);
  position: relative;
  display: inline-block;
}

.footer-section h4::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 30px;
  height: 2px;
  background: linear-gradient(
    to right,
    var(--primary-color),
    var(--secondary-color)
  );
}

.footer-section ul {
  list-style: none;
}

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

.footer-section ul li a {
  color: var(--text-light);
  transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
  color: var(--primary-color);
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-links li a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(78, 84, 200, 0.1);
  border-radius: var(--border-radius-full);
  color: var(--primary-color);
  transition: var(--transition-normal);
}

.social-links li a:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-3px);
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
  padding-top: var(--spacing-md);
  margin-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  color: var(--text-light);
  font-size: 0.9rem;
}