:root {
    --primary: #3771f4;
    --secondary: #1b07d7;
    --secondary-dark: #1606ac;
    --text-light: #f4f4f4;
    --text-dark: #333;
  }
  

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: var(--text-light);
    background-color: var(--primary);
  }
  
header {
    text-align: center;
    padding: 4rem 1.5rem 3rem 1.5rem;
    background: var(--primary);
    color: var(--text-dark);
  }

header h1 {
    font-size: 3.2rem;
    margin-top: 0.1rem;
    margin-bottom: 0.1rem;
  }

header p {
    font-size: 1.8rem;
    margin-bottom: 4rem;
    line-height: 1.2;
  }

/* Mobile optimizations */
@media (max-width: 767px) {
  header h1 {
    font-size: 2.5rem;
    text-align: center;
  }
  
  header p {
    font-size: 1.2rem;
    text-align: center;
    line-height: 1.3;
    margin-bottom: 2rem;
  }
  
  /* Mobile text abbreviation - hide original text and show abbreviated version */
  header p {
    font-size: 0;
  }
  
  header p::before {
    content: "B.S. in Bioinformatics\A University of California, Santa Cruz";
    font-size: 1.2rem;
    line-height: 1.3;
    white-space: pre-line;
  }
  
  .hero {
    padding: 2rem 1.5rem;
    width: calc(100% - 2rem);
    margin: 0 auto;
    max-width: calc(100vw - 2rem);
  }
  
  .intro {
    text-align: center;
  }
  
  .btn {
    width: 200px !important;
    font-size: 0.9rem;
  }
  
  .social-links {
    gap: 1rem;
  }
  
  .social-icon {
    width: 28px;
    height: 28px;
  }
  
  .gmail-icon {
    width: 28px;
    height: 32px;
  }
  
  /* Projects section mobile */
  section {
    padding: 0.5rem 1rem 1.5rem 1rem;
  }
  
  .project-card {
    padding: 1rem;
  }
  
  .project-card h3 {
    font-size: 1.1rem;
  }
  
  .project-card p {
    font-size: 0.9rem;
  }
  
  /* Footer mobile */
  #contact ul {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  #contact li {
    margin: 0.25rem 0;
  }
  
  footer li {
    margin: 0 1rem;
  }
}

.btn {
        display: inline-flex !important;      /* allows centering */
        align-items: center;
        justify-content: center;
        width: 220px !important;              /* force specific width */
        padding: 8px 12px;         /* reduced padding */
        background-color: var(--secondary);  /* button color */
        color: white;               /* text color */
        text-decoration: none;      /* remove underline */
        border-radius: 50px;        /* makes the ends fully rounded */
        font-weight: bold;
        transition: background-color 0.3s;
  }
    
.btn:hover {
        background-color: #5DADE2;
  }

/* Social Media Icons */
.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.social-icon {
    transition: transform 0.2s ease, opacity 0.2s ease;
    filter: grayscale(100%) opacity(0.7);
}

.github-icon,
.linkedin-icon,
.gmail-icon {
    width: 32px;
    height: 32px;
}

/*
.gmail-icon {
    width: 40px;
    height: 32px;
}*/

.social-icon:hover {
    transform: scale(1.1);
    filter: grayscale(0%) opacity(1);
}

.social-links a {
    text-decoration: none;
}

/* Email copy tooltip */
.email-tooltip {
    position: absolute;
    background-color: #333;
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: bold;
    z-index: 1000;
    display: none;
    opacity: 0;
    transition: opacity 0.3s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    white-space: nowrap;
}

/* Speech bubble arrow */
.email-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: #333;
}
    

section {
    padding: 0.5rem 2rem 1.5rem 2rem;
    max-width: 1000px;
    margin: auto;
    opacity: 0;
    animation: contentFadeIn 0.8s ease-out 1.6s forwards;
  }

h2 {
    text-align: left;
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
    font-weight: normal;
  }

    /* Projects List */
.projects-grid {
    display: flex;
    flex-direction: column;
    gap: 2rem;
  }

.project-card {
    position: relative;
    background: var(--primary);
    padding: 1.5rem;
    transition: transform 0.2s ease;
  }


.project-card img {
    width: 40%;
    display: block;
    /*border-radius: 10px;*/
  }

.project-card h3, 
.project-card p {
    margin: 0.5rem;
  }

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.85);
    color: #fff;
    padding: 1rem;
    text-align: left;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    transition: opacity 0.3s ease;
    opacity: 0;
    visibility: hidden;
  }


.project-card:hover .project-overlay {
    opacity: 1;
    visibility: visible;
  }

    /* Contact Section */
#contact ul {
    list-style: none;
    padding: 0;
    text-align: center;
    display: flex;
    justify-content: space-around;
    max-width: 600px;
    margin: 0 auto 2rem auto;
  }
#contact li {
    display: inline-block;
    }
#contact a {
    color: #0073e6;
    text-decoration: none;
    font-weight: bold;
  }
#contact a:hover {
    text-decoration: underline;
  }

    /* References */
.refs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 1rem;
  }

.ref-item {
    background: #f7f7f7;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    text-align: center;
    font-style: italic;
    color: var(--text-dark);
  }

@media (max-width: 768px) {
.refs {
    display: flex;
    overflow-x: auto;
    gap: 1rem;
    padding: 0.5rem 0;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
  }
.ref-item {
    flex: 0 0 280px;
    scroll-snap-align: start;
  }
}
.hero {
    display: flex;
    flex-direction: column;   /* stack on mobile */
    align-items: center;
    gap: 2rem;
    background: #f7f7f7;                 /* off-white card */
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.12);
    padding: 4rem;                        /* doubled card padding */
    max-width: min(900px, calc(100vw - 1rem)) !important; 
    margin: 0 auto;                       /* center the card */
    width: auto;
    opacity: 0;
    transform: translateX(20px);
    animation: heroSlideIn 1s ease-out 0.1s forwards;
  }

.profile-pic {
    display: none; /* temporarily hide image */
  }

    /* For larger screens, put text beside photo */
@media (min-width: 768px) {
.hero {
        flex-direction: row;
        justify-content: flex-start;
        text-align: left;
        align-items: center;
  }
.intro {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    width: 100%;
  }

.intro .btn {
    align-self: center;
  }

.intro .social-links {
    align-self: center;
  }
  }

footer {
    background-color: #273962;   /* dark footer */
    color: #fff;              /* light text */
    padding: 2rem;
    text-align: center;
    margin-top: 2rem;         /* separates from content */
  }

footer h2 {
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
  }

footer ul {
    list-style: none;
    padding: 0;
    margin: 0 0 1rem 0;
    }

footer li {
    display: inline-block;
    margin: 0 2rem;
    }

footer a {
    color: #fff !important;
    text-decoration: none;
    /* font-weight: bold; */
    }

footer a:hover {
      text-decoration: underline;
    /* color: #1b07d7; /* your accent color */
    }

  
footer p {
    font-size: 0.7rem;
    opacity: 0.7;
    margin-top: 0.25rem;
    }

/* Hero card slide-in animation */
@keyframes heroSlideIn {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Intro fade-in animation */
@keyframes introFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Content fade-in animation */
@keyframes contentFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.intro {
  opacity: 0;
  animation: introFadeIn 0.8s ease-out 0.1s forwards;
}

@media (prefers-reduced-motion: reduce) {
.hero {
    animation: none;
    opacity: 1;
    transform: none;
  }
.intro {
    animation: none;
    opacity: 1;
  }
section {
    animation: none;
    opacity: 1;
  }
}