/* COLOR PALETTE */

:root {
  --bg: #f9f7f3; /* off-white background */
  --bg-card: #ffffff; /* white for cards */
  --text: #010101; /* main text color */
  --text-muted: #56585c; /* lighter gray for secondary text */
  --accent-blue: #54a9d7; /* light blue */
  --accent-blue-dark: #044181; /* darker blue */
  --accent-brown: #8b6f4e; /* warm brown */
  --border: #e6e1d8; /* subtle border color */
}

/* MAIN STYLE */
body {
  margin: 0;
  font-family: "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.6;
}

/* wrapper so content doesnt stretch too wide */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

/*--------------------------*/
/* NAV BAR*/
.navbar {
  background-color: var(--bg-card);
  padding: 1.25rem 2rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* the Nipun Jayakumar button on the left */
.nav-logo {
  font-size: 1.3rem;
  font-weight: bold;
  color: var(--text);
  text-decoration: none;
}

/* the list of links */
.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--accent-blue-dark);
}

.nav-links a.active {
  color: var(--accent-blue-dark);
  border-bottom: 2px solid var(--accent-blue);
  padding-bottom: 4px;
}

/* add padding (breathing room) around the main content */
main {
  padding: 0;
}

/*--------------------------*/
/* HOMEPAGE */
/* intro section at the top of the page */
.intro {
  text-align: center;
  padding: 5rem 2rem 3rem;
  max-width: 800px;
  margin: 0 auto;
}

.intro .greeting {
  color: #8b6f4e; /* warm brown */
  font-size: 1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.intro h1 {
  font-size: 3.5rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.intro .title {
  color: var(--accent-brown);
  font-size: 1.2rem;
  margin: 0;
  font-weight: 500;
}

/* ------------------ */
/* about me section */
.about {
  /* keep text from stretching too wide on big screens */
  max-width: 800px;
  /* center the section horizontally */
  margin: 2rem auto 5rem;
  padding: 0 2rem;
}

.about h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  /* light blue accent line under the heading */
  display: inline-block;
  border-bottom: 3px solid var(--accent-blue);
  padding-bottom: 0.5rem;
}

.about p {
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
  color: var(--text);
}

/* Profile Image */
.intro-photo {
  width: 250px;
  height: 250px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--accent-blue);
  margin-bottom: 1.5rem;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

/* Contact Me Box */
.contact {
  max-width: 735px;
  margin: 3rem auto 5rem;
  padding: 2rem 2.5rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-align: left;
}

.contact h2 {
  font-size: 1.5rem;
  margin: 0 0 1.25rem;
  display: inline-block;
  border-bottom: 3px solid var(--accent-blue);
  padding-bottom: 0.4rem;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.contact-link {
  color: var(--accent-blue-dark);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.contact-link:hover {
  color: var(--accent-brown);
  text-decoration: underline;
}

/* -------------------------- */
/* PAGES */

/* intro on each page */
.page-intro {
  text-align: center;
  padding: 4rem 2rem 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.page-intro h1 {
  font-size: 2.8rem;
  margin: 0 0 1rem;
}

.page-intro p {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin: 0;
}

/* BUCKET LIST PAGE */
.bucket-list {
  max-width: 1100px;
  margin: 2rem auto 5rem;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  grid-auto-rows: 490px;
  gap: 1.5rem;
  align-items: start;
}

/* the outer card is the flip scene, no background here */
.card {
  background-color: transparent;
  border: none;
  padding: 0;
  perspective: 1000px;
  cursor: pointer;
  height: 480px;
  position: relative;
  overflow: hidden;
}

/* card-inner is what actually flips */
.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s ease;
  transform-style: preserve-3d;
}

/* when card has the flipped class, rotate the inner 180 degrees */
.card.flipped .card-inner {
  transform: rotateY(180deg);
}

/* both sides share these styles */
.card-front,
.card-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* front side has padding and is vertically centered */
.card-front {
  padding: 1rem 1rem 8rem 1rem;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 0.5rem;
}

/* back side stacks image on top, content below */
.card-back {
  padding: 0;
  transform: rotateY(180deg);
  background-color: #f4f1ea;
}

.card h2 {
  font-size: 1.5rem;
  margin: 0;
  color: var(--text);
}

.card-meta {
  color: var(--accent-brown);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0;
}

.card-why {
  color: var(--text);
  font-size: 1rem;
  line-height: 1.65;
  margin: 0;
}

/* little click to learn more hint on the front */
.card-hint {
  color: var(--accent-blue-dark);
  font-size: 0.85rem;
  margin-bottom: 0;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* image on the back of the card */
.card-image {
  width: 100%;
  height: 140px;
  object-fit: cover;
  display: block;
}

/* bio and why text on the back */
.card-back .card-bio,
.card-back .card-why {
  padding: 0 1.25rem;
  margin: 0.75rem 0 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

.card-back .card-bio {
  color: var(--text);
  font-weight: 500;
}

.card-back .card-why {
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 1.25rem;
}

/* Visited card styling */
.card.visited .card-front {
  background-color: #f4f1ea;
  border-color: var(--accent-brown);
}

.badge {
  display: inline-block;
  background-color: var(--accent-blue);
  color: white;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 12px;
  margin-left: 0.5rem;
  vertical-align: middle;
  letter-spacing: 0.05em;
}

/* AI PAGE */

/* Title block at the top of the interests page */
.title-block {
  text-align: center;
  padding: 4rem 2rem 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.title-block h1 {
  font-size: 2.8rem;
  margin: 0 0 1rem;
}

.title-block .page-intro {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.6;
}

/* each interest section */
.interests-page {
  max-width: 800px;
  margin: 0 auto 5rem;
  padding: 0 2rem;
}

.interest-section {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.interest-section h2 {
  font-size: 1.8rem;
  margin: 0 0 1rem;
  color: var(--text);
  display: inline-block;
  border-bottom: 3px solid var(--accent-blue);
  padding-bottom: 0.4rem;
}

.interest-section p {
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 1.1rem;
  color: var(--text);
}

/*--------------------------*/
/* Filter Buttons for Bucket List */
.filter-bar {
  max-width: 1100px;
  margin: 1rem auto 2rem;
  padding: 0 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.filter-btn {
  background-color: var(--bg-card);
  border: 2px solid var(--border);
  color: var(--text);
  padding: 0.55rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  /* pill shaped buttons */
  border-radius: 999px;
  /* can turn into poitning hand on hover */
  cursor: pointer;
  transition: all 0.2s ease;
  /* force match*/
  font-family: inherit;
}

.filter-btn:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue-dark);
}

.filter-btn.active {
  background-color: var(--accent-blue-dark);
  border-color: var(--accent-blue-dark);
  color: white;
}

/* hidden cards */
.card.hidden {
  display: none;
}