/* ================================================================
   PRANAV CHANDRA — PORTFOLIO | styles.css
   Professional glassmorphism dark theme
   ================================================================ */

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

:root {
  --bg:        #0a0f14;
  --bg2:       #0f151c;
  --card:      rgba(255, 255, 255, 0.04);
  --glass:     rgba(255, 255, 255, 0.03);
  --border:    rgba(230, 241, 245, 0.1);
  --border-b:  rgba(0, 229, 199, 0.35);
  --blue:      #00e5c7;
  --blue-dim:  rgba(0, 229, 199, 0.12);
  --gold:      #c4c9d4;
  --gold-dim:  rgba(196, 201, 212, 0.1);
  --green:     #7dd3c0;
  --text:      #e6f1f5;
  --muted:     #6b7785;
  --sub:       #9aa5b1;
  --font:      'Inter', sans-serif;
  --mono:      'JetBrains Mono', monospace;
  --r-sm: 8px; --r-md: 12px; --r-lg: 16px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--blue); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--gold); }

/* ------ SKIP LINK ------ */
.skip-link {
  position: absolute; top: -100px; left: 1rem;
  background: var(--blue); color: #fff;
  padding: 0.5rem 1rem; border-radius: var(--r-sm);
  font-weight: 600; z-index: 9999; transition: top 0.2s;
}
.skip-link:focus { top: 1rem; }

/* ------ NAVBAR ------ */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.25rem 2.5rem;
  transition: all 0.35s ease;
}
#navbar.scrolled {
  background: rgba(10, 15, 20, 0.88);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
  padding: 0.875rem 2.5rem;
  box-shadow: 0 4px 40px rgba(0, 0, 0, 0.35);
}
.nav-logo {
  font-weight: 800; font-size: 1.15rem; color: var(--gold);
  letter-spacing: -0.02em; font-family: var(--mono);
  text-decoration: none; transition: color 0.2s;
}
.nav-logo:hover { color: var(--blue); }
.nav-links { display: flex; gap: 2.25rem; list-style: none; }
.nav-links a {
  color: var(--sub); font-size: 0.875rem; font-weight: 500;
  position: relative; padding-bottom: 2px;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -2px; left: 0; right: 100%;
  height: 1px; background: var(--blue); transition: right 0.25s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--text); }
.nav-links a:hover::after,
.nav-links a.active::after { right: 0; }

/* Hamburger button */
.nav-toggle {
  display: none; flex-direction: column; justify-content: center;
  gap: 5px; width: 32px; height: 32px;
  cursor: pointer; background: none; border: none; padding: 4px; z-index: 201;
}
.nav-toggle span { display: block; height: 2px; background: var(--text); border-radius: 2px; transition: all 0.3s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav drawer */
.nav-drawer {
  position: fixed; top: 0; right: -100%; bottom: 0;
  width: min(320px, 85vw);
  background: rgba(10, 15, 20, 0.97);
  backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  border-left: 1px solid var(--border); z-index: 199;
  display: flex; flex-direction: column;
  justify-content: center; align-items: center; gap: 2.5rem;
  transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  list-style: none;
}
.nav-drawer.open { right: 0; }
.nav-drawer li a { font-size: 1.2rem; font-weight: 600; color: var(--sub); }
.nav-drawer li a:hover { color: var(--text); }

.nav-overlay {
  position: fixed; inset: 0; background: rgba(0, 0, 0, 0.55);
  z-index: 198; opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.nav-overlay.open { opacity: 1; pointer-events: all; }

/* ------ HERO ------ */
#hero {
  min-height: 100vh; display: flex; align-items: center;
  justify-content: center; text-align: center;
  padding: 8rem 2rem 5rem; position: relative; overflow: hidden;
}
#hero::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 70% 55% at 50% -5%, rgba(0,229,199,0.12) 0%, transparent 62%),
    radial-gradient(ellipse 40% 30% at 85% 85%, rgba(196,201,212,0.05) 0%, transparent 55%);
}
.hero-inner { position: relative; z-index: 1; max-width: 720px; }

h1 {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 800; letter-spacing: -0.04em; line-height: 1.05; margin-bottom: 1.25rem;
}
h1 span {
  background: linear-gradient(135deg, var(--blue) 20%, var(--gold) 80%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.hero-sub {
  font-size: 1.1rem; color: var(--sub); max-width: 580px;
  margin: 0 auto 2.75rem; font-weight: 400; line-height: 1.7;
  text-wrap: balance;
}
.hero-btns { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

.hero-scroll {
  position: absolute; bottom: 2.5rem; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  color: var(--muted); font-size: 0.7rem; font-family: var(--mono);
  letter-spacing: 0.1em; text-transform: uppercase;
  animation: bounce 2.5s ease-in-out infinite; transition: opacity 0.4s;
}
.hero-scroll.hidden { opacity: 0; pointer-events: none; }

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-7px); }
}

/* ------ BUTTONS ------ */
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.8rem 1.9rem; border-radius: var(--r-sm);
  font-weight: 600; font-size: 0.9rem; transition: all 0.22s;
  cursor: pointer; border: none; white-space: nowrap; font-family: var(--font);
}
.btn-primary { background: var(--blue); color: #0a0f14; }
.btn-primary:hover {
  background: #2affe0; transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,229,199,0.3); color: #0a0f14;
}
.btn-outline {
  background: var(--glass); color: var(--text);
  border: 1px solid var(--border-b); backdrop-filter: blur(8px);
}
.btn-outline:hover {
  background: var(--blue-dim); border-color: var(--blue);
  color: var(--blue); transform: translateY(-2px);
}

/* ------ SECTIONS ------ */
section { padding: 5.5rem 0; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }

.section-label {
  font-family: var(--mono); font-size: 0.7rem; color: var(--blue);
  letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 0.6rem; opacity: 0.85;
}
.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.4rem); font-weight: 700;
  letter-spacing: -0.03em; margin-bottom: 0.9rem;
}
.section-line {
  width: 52px; height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--gold));
  border-radius: 2px; margin-bottom: 3.25rem;
}

/* ------ ABOUT ------ */
#about { background: var(--bg2); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start; }
.about-text p { color: var(--sub); line-height: 1.85; margin-bottom: 1.1rem; font-size: 0.95rem; }
.about-links { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.75rem; }
.about-link {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.45rem 1rem; border-radius: var(--r-sm);
  background: var(--glass); border: 1px solid var(--border);
  font-size: 0.8rem; color: var(--sub); font-weight: 500;
  transition: all 0.2s; backdrop-filter: blur(8px);
}
.about-link:hover { border-color: var(--blue); color: var(--blue); background: var(--blue-dim); }

/* Info panel — glass effect */
.about-info {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 1.75rem;
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.06), 0 4px 32px rgba(0,0,0,0.25);
}
.info-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.8rem 0; border-bottom: 1px solid var(--border); font-size: 0.875rem;
}
.info-item:last-child { border-bottom: none; }
.info-key { color: var(--muted); }
.info-val { color: var(--text); font-weight: 500; }

/* ------ SKILLS ------ */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 1.5rem; }
.skill-cat {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--r-md); padding: 1.75rem;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
  transition: border-color 0.25s, box-shadow 0.25s;
}
.skill-cat:hover {
  border-color: rgba(0,229,199,0.35);
  box-shadow: 0 4px 24px rgba(0,0,0,0.2), inset 0 1px 0 rgba(255,255,255,0.07);
}
.skill-cat-title {
  font-size: 0.72rem; font-family: var(--mono); color: var(--gold);
  text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 1.1rem;
}
.skill-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.skill-tag {
  font-size: 0.72rem; padding: 0.28rem 0.75rem; border-radius: 20px;
  background: rgba(0,229,199,0.08); border: 1px solid rgba(0,229,199,0.18);
  color: var(--blue); font-family: var(--mono);
}

/* ------ EXPERIENCE ------ */
#experience { background: var(--bg2); }
.timeline { position: relative; padding-left: 1.5rem; }
.timeline::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 2px;
  background: linear-gradient(180deg, var(--blue) 0%, var(--gold) 100%); border-radius: 2px;
}
.tl-item { position: relative; padding: 0 0 3rem 2.25rem; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ''; position: absolute; left: -6px; top: 6px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--blue); border: 2px solid var(--bg2);
  box-shadow: 0 0 0 3px rgba(0,229,199,0.2);
}
.tl-date { font-family: var(--mono); font-size: 0.72rem; color: var(--blue); letter-spacing: 0.06em; margin-bottom: 0.35rem; }
.tl-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 0.2rem; }
.tl-company { font-size: 0.875rem; color: var(--gold); font-weight: 600; margin-bottom: 1rem; }
.tl-desc { list-style: none; display: flex; flex-direction: column; gap: 0.55rem; }
.tl-desc li { font-size: 0.875rem; color: var(--sub); padding-left: 1.2rem; position: relative; line-height: 1.65; }
.tl-desc li::before { content: '→'; position: absolute; left: 0; color: var(--blue); font-size: 0.8rem; }

/* ------ PROJECTS ------ */
.proj-sublabel {
  font-family: var(--mono); font-size: 0.7rem; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.1em;
  display: flex; align-items: center; gap: 0.75rem;
  margin: 2.5rem 0 1.25rem;
}
.proj-sublabel::after { content: ''; flex: 1; height: 1px; background: var(--border); }

.proj-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(310px, 1fr)); gap: 1.75rem; }
.proj-grid.solo { grid-template-columns: minmax(0, 580px); justify-content: center; }
.proj-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: 2rem; transition: all 0.3s; position: relative; overflow: hidden;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
}
.proj-card::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(135deg, rgba(0,229,199,0.04), rgba(196,201,212,0.03));
  opacity: 0; transition: opacity 0.3s;
}
.proj-card:hover {
  border-color: rgba(0,229,199,0.4); transform: translateY(-5px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.08);
}
.proj-card:hover::before { opacity: 1; }
.proj-card.featured { border-color: rgba(212,212,212,0.2); }
.proj-card.featured:hover { border-color: rgba(212,212,212,0.45); }

.proj-badge {
  display: inline-flex; align-items: center; gap: 0.3rem;
  font-family: var(--mono); font-size: 0.68rem; color: var(--gold);
  border: 1px solid rgba(212,212,212,0.3); background: rgba(212,212,212,0.07);
  padding: 0.2rem 0.65rem; border-radius: 4px; margin-bottom: 1rem; letter-spacing: 0.04em;
}
.proj-badge.work {
  color: var(--blue); border-color: rgba(0,229,199,0.3); background: rgba(0,229,199,0.07);
}
.proj-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 0.5rem; letter-spacing: -0.02em; }
.proj-desc { font-size: 0.875rem; color: var(--sub); line-height: 1.75; margin-bottom: 1.25rem; }
.proj-tech { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 1.35rem; }
.tech-tag {
  font-size: 0.68rem; font-family: var(--mono); padding: 0.22rem 0.65rem;
  border-radius: 4px; background: rgba(0,229,199,0.08); color: var(--blue);
}
.tech-tag.os { background: rgba(212,212,212,0.08); color: var(--gold); }
.tech-tag.work { background: rgba(154,184,127,0.08); color: var(--green); }
.proj-links { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.proj-link {
  font-size: 0.8rem; padding: 0.4rem 0.95rem; border-radius: var(--r-sm);
  border: 1px solid var(--border); color: var(--muted);
  transition: all 0.2s; display: inline-flex; align-items: center; gap: 0.35rem;
  font-weight: 500; background: var(--glass);
}
.proj-link:hover { border-color: var(--blue); color: var(--blue); background: var(--blue-dim); }

/* ------ EDUCATION ------ */
#education { background: var(--bg2); }
.edu-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: 2rem; display: flex; align-items: flex-start; gap: 1.5rem;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.05); transition: border-color 0.25s;
}
.edu-card:hover { border-color: rgba(0,229,199,0.3); }
.edu-card + .edu-card { margin-top: 1.25rem; }
.edu-icon {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, rgba(0,229,199,0.18), rgba(196,201,212,0.12));
  border: 1px solid var(--border); border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center; font-size: 1.4rem; flex-shrink: 0;
}
.edu-degree { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.2rem; }
.edu-school { color: var(--blue); font-size: 0.9rem; font-weight: 600; margin-bottom: 0.25rem; }
.edu-date { font-family: var(--mono); font-size: 0.72rem; color: var(--muted); margin-bottom: 0.75rem; }
.edu-note { font-size: 0.85rem; color: var(--sub); line-height: 1.65; }

/* ------ RESUME ------ */
#resume { background: var(--bg2); }
.resume-desc { color: var(--sub); font-size: 0.95rem; line-height: 1.8; margin-bottom: 2.5rem; max-width: 640px; }
.resume-grid { display: grid; grid-template-columns: 1fr; gap: 1.75rem; max-width: 560px; }
.resume-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: 2rem; backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.05); transition: border-color 0.25s;
}
.resume-card:hover { border-color: rgba(0,229,199,0.35); }
.resume-icon { font-size: 2rem; margin-bottom: 1rem; }
.resume-card-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem; }
.resume-card-desc { font-size: 0.85rem; color: var(--sub); line-height: 1.7; margin-bottom: 1.5rem; }
.resume-btn { width: 100%; justify-content: center; }

@media (max-width: 768px) {
  .resume-grid { grid-template-columns: 1fr; }
}

/* ------ CONTACT ------ */
.contact-inner { max-width: 680px; margin: 0 auto; text-align: center; }
.contact-desc { color: var(--sub); font-size: 1rem; margin-bottom: 2.5rem; line-height: 1.8; }
.contact-links { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-bottom: 2.5rem; }
.contact-link {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.8rem 1.6rem; border-radius: var(--r-sm);
  border: 1px solid var(--border); color: var(--text); font-weight: 500; font-size: 0.875rem;
  transition: all 0.22s; background: var(--card); backdrop-filter: blur(12px);
}
.contact-link:hover {
  border-color: var(--blue); color: var(--blue); background: var(--blue-dim);
  transform: translateY(-2px); box-shadow: 0 6px 24px rgba(0,229,199,0.15);
}

/* Contact form */
.contact-form {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: 2rem; text-align: left; backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px); box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1rem; }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; margin-bottom: 1rem; }
.form-group:last-of-type { margin-bottom: 0; }
.form-group label { font-size: 0.8rem; color: var(--sub); font-weight: 500; }
.form-group input, .form-group textarea {
  background: rgba(255,255,255,0.04); border: 1px solid var(--border);
  border-radius: var(--r-sm); padding: 0.75rem 1rem; color: var(--text);
  font-family: var(--font); font-size: 0.875rem; outline: none;
  transition: border-color 0.2s, box-shadow 0.2s; resize: vertical;
}
.form-group input:focus, .form-group textarea:focus {
  border-color: var(--blue); box-shadow: 0 0 0 3px rgba(0,229,199,0.12);
  background: rgba(0,229,199,0.04);
}
.form-group textarea { min-height: 120px; }
.form-submit { display: flex; justify-content: flex-end; margin-top: 1.25rem; }

/* ------ FOOTER ------ */
footer {
  padding: 2rem; text-align: center; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 0.8rem; font-family: var(--mono);
}

/* ------ FADE IN ------ */
.fade-in { opacity: 0; transform: translateY(28px); transition: opacity 0.65s ease, transform 0.65s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ------ RESPONSIVE ------ */
@media (max-width: 1024px) {
  .about-grid { gap: 2.5rem; }
  .proj-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  #navbar { padding: 1rem 1.5rem; }
  #navbar.scrolled { padding: 0.75rem 1.5rem; }
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .proj-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .edu-card { flex-direction: column; gap: 1rem; }
  section { padding: 4rem 0; }
}

@media (max-width: 480px) {
  #hero { padding: 7rem 1.25rem 4rem; }
  .container { padding: 0 1.25rem; }
  .hero-btns { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
  .contact-links { flex-direction: column; align-items: stretch; }
  .contact-link { justify-content: center; }
}

@media (min-width: 1400px) {
  .container { max-width: 1240px; }
}