/* ================================================================
   PORTFOLIO STYLESHEET
   ================================================================
   HOW TO CUSTOMIZE:
   1. Change colors/fonts in the ":root" block at the top
   2. Each section has its own labeled comment block below
   ================================================================ */


/* ================================================================
   THEME VARIABLES — edit these to retheme the entire site at once
   ================================================================ */
:root {
  /* -- Colors -- */
  --color-bg:           #f5f7ff;      /* page background */
  --color-surface:      #ffffff;      /* card / panel background */
  --color-border:       #e0e7ff;      /* subtle borders */
  --color-text:         #0f172a;      /* main body text */
  --color-text-muted:   #64748b;      /* secondary / caption text */
  --color-accent:       #4f46e5;      /* primary accent — indigo */
  --color-accent-dark:  #3730a3;      /* accent hover */
  --color-accent-2:     #7c3aed;      /* secondary accent — violet (used in gradients) */

  /* Gradient used across host and accents */
  --gradient-accent: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));

  /* -- Typography -- */
  --font-family:    'Inter', sans-serif;
  --font-size-base: 1rem;

  /* -- Spacing -- */
  --section-padding: 5rem 1.5rem;
  --card-radius:     1rem;
  --card-shadow:     0 4px 20px rgba(79, 70, 229, 0.08);

  /* -- Transitions -- */
  --transition:      0.25s ease;
}


/* ================================================================
   RESET & BASE STYLES
   ================================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: var(--font-size-base);
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--color-accent-dark); }

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

ul { list-style: none; }


/* ================================================================
   REUSABLE UTILITIES
   ================================================================ */

/* Centered content wrapper */
.section-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--section-padding);
}

/* Section headings */
.section-title {
  font-size: 2.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  text-align: center;
  letter-spacing: -0.02em;
}
.section-title::after {
  content: '';
  display: block;
  width: 3rem;
  height: 3px;
  /* Gradient underline on every section title */
  background: var(--gradient-accent);
  margin: 0.5rem auto 2rem;
  border-radius: 2px;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  margin-top: -1.5rem;
  margin-bottom: 2.5rem;
}

/* ---- Buttons ---- */
/* Shared base */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.9rem;
  border-radius: 0.6rem;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: transform var(--transition), box-shadow var(--transition),
              background var(--transition), opacity var(--transition);
  position: relative;
  overflow: hidden;
}
/* Shimmer on hover for all buttons */
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.12);
  opacity: 0;
  transition: opacity var(--transition);
}
.btn:hover::after { opacity: 1; }
.btn:hover { transform: translateY(-2px); }

/* Primary: gradient fill */
.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}
.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
  color: #fff;
}

/* Secondary: outlined with gradient text */
.btn-secondary {
  background: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}
.btn-secondary:hover {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.25);
}

/* ---- Tags / badges ---- */
.tag {
  display: inline-block;
  background: rgba(79, 70, 229, 0.08);
  color: var(--color-accent);
  border: 1px solid rgba(79, 70, 229, 0.2);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: background var(--transition), color var(--transition);
}
.tag:hover {
  background: var(--color-accent);
  color: #fff;
}


/* ================================================================
   NAVIGATION
   ================================================================ */
#navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(224, 231, 255, 0.8);
  transition: box-shadow var(--transition);
}
/* JS adds .scrolled when user scrolls down — gives the nav more depth */
#navbar.scrolled {
  box-shadow: 0 4px 20px rgba(79, 70, 229, 0.1);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Gradient logo text */
.nav-logo {
  font-size: 1.3rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Nav link list */
.nav-links {
  display: flex;
  gap: 2rem;
}
.nav-links a {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.9rem;
  position: relative;
  padding-bottom: 2px;
  transition: color var(--transition);
}
/* Animated underline on nav links */
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
  transition: width var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--color-accent);
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}


/* ================================================================
   HERO SECTION
   ================================================================ */
#host {
  /* Radial gradient gives a soft glow behind the text */
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(124, 58, 237, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(79, 70, 229, 0.08) 0%, transparent 60%),
    var(--color-bg);
  padding: 7rem 1.5rem 6rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* Decorative floating orbs in the background */
#host::before,
#host::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
  animation: float 8s ease-in-out infinite alternate;
}
#host::before {
  width: 500px;
  height: 500px;
  top: -200px;
  right: -100px;
  background: rgba(124, 58, 237, 0.1);
}
#host::after {
  width: 400px;
  height: 400px;
  bottom: -150px;
  left: -100px;
  background: rgba(79, 70, 229, 0.08);
  animation-delay: -4s;
}

@keyframes float {
  from { transform: translateY(0px) scale(1);   }
  to   { transform: translateY(30px) scale(1.05); }
}

.host-content {
  max-width: 700px;
  margin: 0 auto;
  position: relative; /* above the orbs */
  z-index: 1;
}

/* Pill badge above the name */
.host-greeting {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(79, 70, 229, 0.1);
  color: var(--color-accent);
  border: 1px solid rgba(79, 70, 229, 0.2);
  padding: 0.3rem 1rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}
/* Blinking dot inside the greeting pill */
.host-greeting::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #22c55e;   /* green "online" dot */
  box-shadow: 0 0 6px rgba(34,197,94,0.6);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1);   }
  50%       { opacity: 0.5; transform: scale(0.8); }
}

/* Gradient text on the main name */
.host-name {
  font-size: clamp(2.8rem, 7vw, 4.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.host-tagline {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

.host-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Scroll cue arrow below host */
.host-scroll-cue {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  animation: bounce 2s ease-in-out infinite;
}
.host-scroll-cue svg {
  width: 18px;
  height: 18px;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(6px); }
}


/* ================================================================
   ABOUT SECTION
   ================================================================ */
#about {
  background: var(--color-surface);
  position: relative;
}
/* Subtle top border gradient */
#about::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-accent);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3.5rem;
  align-items: start;
}

/* Profile photo with gradient ring */
.about-photo {
  display: flex;
  justify-content: center;
}
.about-photo-ring {
  padding: 4px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: inline-block;
  line-height: 0;
  box-shadow: 0 8px 30px rgba(79, 70, 229, 0.25);
}
.about-photo-ring img {
  width: 190px;
  height: 190px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid white;
}

.about-text p {
  color: var(--color-text-muted);
  margin-bottom: 1.75rem;
  font-size: 1.05rem;
}

.skills h3 {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}


/* ================================================================
   PROJECTS SECTION
   ================================================================ */
#projects {
  background: var(--color-bg);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.5rem;
}

/* Project card */
.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition),
              border-color var(--transition);
}

/* Accent stripe at the top of each card */
.project-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.project-card:hover::before { transform: scaleX(1); }

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 40px rgba(79, 70, 229, 0.14);
  border-color: rgba(79, 70, 229, 0.25);
}

/* Card number badge (added by JS) */
.project-number {
  font-size: 0.75rem;
  font-weight: 700;
  color: rgba(79, 70, 229, 0.3);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.project-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.project-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  flex: 1;
  line-height: 1.65;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* Divider line above links */
.project-links {
  display: flex;
  gap: 1rem;
  padding-top: 0.85rem;
  margin-top: 0.25rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  font-weight: 600;
}
.project-links a {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--color-accent);
  transition: gap var(--transition), color var(--transition);
}
.project-links a:hover {
  gap: 0.55rem;   /* subtle arrow-slide feel */
  color: var(--color-accent-dark);
}

/* Optional screenshot */
.project-image {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: calc(var(--card-radius) - 4px);
  border: 1px solid var(--color-border);
}


/* ================================================================
   RESUME SECTION
   ================================================================ */
#resume {
  background: var(--color-surface);
  position: relative;
}
#resume::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-accent);
}

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

.resume-content p {
  color: var(--color-text-muted);
  max-width: 500px;
  font-size: 1.05rem;
}

.resume-embed {
  width: 100%;
  max-width: 800px;
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(79, 70, 229, 0.1);
}

.resume-embed iframe {
  display: block;
  border: none;
}


/* ================================================================
   FOOTER / CONTACT SECTION
   ================================================================ */
#contact {
  /* Rich dark gradient footer */
  background: linear-gradient(135deg, #0f0c29, #1a1a3e, #24243e);
  color: #fff;
  padding: 5rem 1.5rem 3rem;
  position: relative;
  overflow: hidden;
}
/* Decorative background orb */
#contact::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79,70,229,0.15), transparent 70%);
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
}

.footer-container {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.footer-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  /* Gradient text in the footer heading */
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-title::after { display: none; }

.footer-subtitle {
  color: rgba(255,255,255,0.5);
  margin-bottom: 3rem;
  font-size: 1.05rem;
}

/* Social links as pill cards */
.social-links {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  align-items: center;
  margin-bottom: 3.5rem;
}
.social-links li {
  width: 100%;
  max-width: 380px;
}
.social-links a {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1.25rem;
  border-radius: 0.75rem;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.8);
  font-size: 0.95rem;
  font-weight: 500;
  transition: background var(--transition), border-color var(--transition),
              color var(--transition), transform var(--transition);
  text-align: left;
}
.social-links a:hover {
  background: rgba(79,70,229,0.25);
  border-color: rgba(79,70,229,0.5);
  color: #fff;
  transform: translateX(4px);
}
.social-links svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  opacity: 0.7;
}
.social-links a:hover svg { opacity: 1; }

.footer-copy {
  color: rgba(255,255,255,0.25);
  font-size: 0.82rem;
}


/* ================================================================
   SCROLL-TO-TOP BUTTON
   Appears after scrolling down 400px (shown/hidden by JS)
   ================================================================ */
#scrollToTop {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-accent);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.4);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity var(--transition), transform var(--transition);
  z-index: 200;
}
#scrollToTop.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
#scrollToTop:hover { transform: translateY(-2px); }
#scrollToTop svg {
  width: 18px;
  height: 18px;
}


/* ================================================================
   FADE-IN ANIMATION (applied by JS)
   ================================================================ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
/* Stagger project cards */
.project-card:nth-child(2) { transition-delay: 0.08s; }
.project-card:nth-child(3) { transition-delay: 0.16s; }
.project-card:nth-child(4) { transition-delay: 0.24s; }
.project-card:nth-child(5) { transition-delay: 0.32s; }
.project-card:nth-child(6) { transition-delay: 0.40s; }


/* ================================================================
   RESPONSIVE — MOBILE (768px and smaller)
   ================================================================ */
@media (max-width: 768px) {

  /* Mobile nav dropdown */
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem 0;
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
  }
  .nav-links.open { display: flex; }
  .nav-links li a {
    display: block;
    padding: 0.75rem 1.5rem;
  }

  /* Stack about section */
  .about-content {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }
  .skill-tags { justify-content: center; }

  /* Single-column project grid */
  .projects-grid { grid-template-columns: 1fr; }

  /* Shrink host orbs on mobile */
  #host::before { width: 300px; height: 300px; }
  #host::after  { width: 250px; height: 250px; }

  /* Footer social links full-width on mobile */
  .social-links li { max-width: 100%; }

  /* Hide scroll-to-top on very small screens */
  #scrollToTop { display: none; }
}