/* ═══════════════════════════════════════════════════════════════════
   Francis Chanda – Portfolio  |  styles.css
   ═══════════════════════════════════════════════════════════════════ */

/* ── Custom Properties ─────────────────────────────────────────── */
:root {
  --clr-bg:       #0a0f1e;
  --clr-surface:  #111827;
  --clr-card:     #1a2235;
  --clr-border:   #1e2d45;
  --clr-accent:   #3b82f6;
  --clr-accent-2: #8b5cf6;
  --clr-text:     #e2e8f0;
  --clr-muted:    #94a3b8;
  --clr-heading:  #f8fafc;
  --clr-white:    #ffffff;

  --ff-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --ff-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.3);
  --shadow-md:  0 4px 16px rgba(0,0,0,.4);
  --shadow-lg:  0 8px 32px rgba(0,0,0,.5);

  --transition: 250ms ease;

  --header-h: 64px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--ff-sans);
  background-color: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.7;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ── Utilities ─────────────────────────────────────────────────── */
.container {
  max-width: 1140px;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.accent { color: var(--clr-accent); }

.section {
  padding-block: 5rem;
}

.section--alt {
  background-color: var(--clr-surface);
}

.section__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--clr-heading);
  text-align: center;
  margin-bottom: 3rem;
}

.section__intro {
  max-width: 720px;
  margin: -1.5rem auto 3rem;
  text-align: center;
  color: var(--clr-muted);
}

/* ── Buttons ───────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .65rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: .95rem;
  transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition);
}

.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: linear-gradient(135deg, var(--clr-accent), var(--clr-accent-2));
  color: var(--clr-white);
}

.btn--primary:hover {
  background: linear-gradient(135deg, #2563eb, #7c3aed);
}

.btn--outline {
  border: 2px solid var(--clr-accent);
  color: var(--clr-accent);
}

.btn--outline:hover {
  background-color: var(--clr-accent);
  color: var(--clr-white);
}

.btn--full { width: 100%; justify-content: center; }

/* ── Header & Nav ──────────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  inset-inline: 0;
  height: var(--header-h);
  z-index: 100;
  background-color: transparent;
  transition: background-color var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  background-color: rgba(10, 15, 30, .92);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  font-size: 1.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--clr-accent), var(--clr-accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: .05em;
}

.nav__links {
  display: flex;
  gap: 2rem;
}

.nav__link {
  font-weight: 500;
  color: var(--clr-muted);
  transition: color var(--transition);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--clr-accent);
  transition: width var(--transition);
}

.nav__link:hover,
.nav__link.active {
  color: var(--clr-text);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: .25rem;
}

.nav__burger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--clr-text);
  border-radius: var(--radius-full);
  transition: transform var(--transition), opacity var(--transition);
}

.nav__burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.open span:nth-child(2) { opacity: 0; }
.nav__burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Hero ──────────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 680px;
  padding-block: 7rem 4rem;
}

.hero__greeting {
  font-size: 1.1rem;
  color: var(--clr-accent);
  font-weight: 600;
  margin-bottom: .5rem;
}

.hero__name {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 800;
  color: var(--clr-heading);
  line-height: 1.1;
  margin-bottom: .75rem;
}

.hero__title {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 500;
  color: var(--clr-muted);
  margin-bottom: 1.5rem;
  min-height: 2.2em;
}

.cursor {
  display: inline-block;
  color: var(--clr-accent);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.hero__bio {
  color: var(--clr-muted);
  max-width: 560px;
  margin-bottom: 2rem;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.hero__social { display: flex; gap: 1rem; }

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  border: 1px solid var(--clr-border);
  color: var(--clr-muted);
  font-size: 1.1rem;
  transition: color var(--transition), border-color var(--transition), background-color var(--transition);
}

.social-link:hover {
  color: var(--clr-accent);
  border-color: var(--clr-accent);
  background-color: rgba(59,130,246,.1);
}

.hero__scroll-cue {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 1.25rem;
  color: var(--clr-muted);
  animation: bounce 2s ease infinite;
  z-index: 2;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* decorative blob */
.hero__decoration {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.blob {
  position: absolute;
  top: -10%;
  right: -10%;
  width: min(600px, 80vw);
  aspect-ratio: 1;
  background: radial-gradient(
    circle at 30% 40%,
    rgba(59,130,246,.18) 0%,
    rgba(139,92,246,.12) 50%,
    transparent 70%
  );
  border-radius: 60% 40% 55% 45% / 50% 60% 40% 50%;
  animation: morph 12s ease-in-out infinite alternate;
}

@keyframes morph {
  0%   { border-radius: 60% 40% 55% 45% / 50% 60% 40% 50%; }
  50%  { border-radius: 45% 55% 40% 60% / 60% 40% 55% 45%; }
  100% { border-radius: 55% 45% 60% 40% / 40% 55% 45% 60%; }
}

/* ── About ─────────────────────────────────────────────────────── */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  align-items: center;
}

.about__avatar-wrapper {
  display: flex;
  justify-content: center;
}

.about__avatar {
  width: 220px;
  height: 220px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--clr-accent), var(--clr-accent-2));
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 0 6px rgba(59,130,246,.2), var(--shadow-lg);
}

.about__avatar-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.about__text p {
  color: var(--clr-muted);
  margin-bottom: 1rem;
}

.about__text .btn { margin-top: .5rem; }

/* ── Skills ────────────────────────────────────────────────────── */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  background-color: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 2rem 1.75rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.skill-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--clr-accent);
}

.skill-card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(59,130,246,.15), rgba(139,92,246,.15));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--clr-accent);
  margin-bottom: 1rem;
}

.skill-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--clr-heading);
  margin-bottom: .5rem;
}

.skill-card p {
  font-size: .9rem;
  color: var(--clr-muted);
  line-height: 1.6;
}

/* ── Projects ──────────────────────────────────────────────────── */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background-color: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--clr-accent);
}

.project-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.project-card__icon {
  font-size: 1.75rem;
  color: var(--clr-accent);
}

.project-card__links { display: flex; gap: .75rem; }

.project-card__link {
  font-size: 1.2rem;
  color: var(--clr-muted);
  transition: color var(--transition);
}

.project-card__link:hover { color: var(--clr-accent); }

.project-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--clr-heading);
}

.detail-card__meta {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--clr-muted);
}

.project-card__desc {
  font-size: .9rem;
  color: var(--clr-muted);
  line-height: 1.65;
  flex: 1;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-top: auto;
}

.tag {
  font-size: .75rem;
  font-weight: 600;
  padding: .2rem .65rem;
  border-radius: var(--radius-full);
  background-color: rgba(59,130,246,.12);
  color: var(--clr-accent);
  border: 1px solid rgba(59,130,246,.25);
}

/* ── Contact ───────────────────────────────────────────────────── */
.contact__intro {
  text-align: center;
  color: var(--clr-muted);
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: 3rem;
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  align-items: start;
}

.contact__info { display: flex; flex-direction: column; gap: 1.5rem; }

.contact__item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.contact__item-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(59,130,246,.15), rgba(139,92,246,.15));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--clr-accent);
  flex-shrink: 0;
}

.contact__item h3 {
  font-size: .9rem;
  font-weight: 600;
  color: var(--clr-heading);
  margin-bottom: .25rem;
}

.contact__item a {
  font-size: .9rem;
  color: var(--clr-muted);
  transition: color var(--transition);
}

.contact__item a:hover { color: var(--clr-accent); }

/* Form */
.contact__form { display: flex; flex-direction: column; gap: 1.25rem; }

.form-group { display: flex; flex-direction: column; gap: .4rem; }

.form-group label {
  font-size: .875rem;
  font-weight: 600;
  color: var(--clr-text);
}

.form-group input,
.form-group textarea {
  background-color: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  padding: .75rem 1rem;
  color: var(--clr-text);
  font-family: var(--ff-sans);
  font-size: .95rem;
  resize: vertical;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--clr-muted);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,.15);
}

.form__status {
  font-size: .875rem;
  text-align: center;
  min-height: 1.25em;
}

.form__status.success { color: #4ade80; }
.form__status.error   { color: #f87171; }

/* ── Footer ────────────────────────────────────────────────────── */
.footer {
  background-color: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  padding-block: 2rem;
}

.footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer p {
  font-size: .875rem;
  color: var(--clr-muted);
}

.footer p .fa-heart { color: #f43f5e; margin-inline: .15em; }

.footer__social { display: flex; gap: .75rem; }

/* ── Scroll-reveal animation ───────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .6s ease, transform .6s ease;
}

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

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    inset-block: var(--header-h) 0;
    inset-inline: 0;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    background-color: rgba(10, 15, 30, .97);
    backdrop-filter: blur(16px);
    transform: translateX(100%);
    transition: transform var(--transition);
    z-index: 99;
  }

  .nav__links.open { transform: translateX(0); }

  .nav__link { font-size: 1.25rem; }

  .nav__burger { display: flex; }

  .about__grid,
  .contact__grid {
    grid-template-columns: 1fr;
  }

  .about__avatar-wrapper { order: -1; }

  .hero__cta { flex-direction: column; align-items: flex-start; }
}

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