/* ============================================
   KavinLabs — Global Stylesheet
   Space-themed, mobile-first portfolio
   ============================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Nunito:wght@400;600;700;800&display=swap');

/* --- CSS Variables (Design Tokens) --- */
:root {
  --space-dark:    #05060f;
  --space-navy:    #0d0f2b;
  --space-card:    #111435;
  --space-border:  #1e2255;

  --orange:        #ff7043;
  --orange-light:  #ff9a7b;
  --cyan:          #00e5ff;
  --cyan-light:    #80f4ff;
  --yellow:        #ffd600;
  --purple:        #7c4dff;

  --text-primary:  #f0f4ff;
  --text-muted:    #8892b0;
  --text-dim:      #4a5275;

  --font-display:  'Orbitron', sans-serif;
  --font-body:     'Nunito', sans-serif;

  --radius-sm:     8px;
  --radius-md:     16px;
  --radius-lg:     24px;
  --radius-xl:     32px;

  --nav-height:    64px;
  --transition:    all 0.25s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background-color: var(--space-dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

/* --- Star Background --- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 10% 15%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 30% 60%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 50% 25%, rgba(255,255,255,0.7) 0%, transparent 100%),
    radial-gradient(1px 1px at 70% 80%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 85% 40%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 20% 85%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 60% 10%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 90% 70%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 40% 95%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 75% 55%, rgba(255,255,255,0.6) 0%, transparent 100%);
  z-index: 0;
  pointer-events: none;
}

body > * { position: relative; z-index: 1; }

/* --- Typography --- */
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.2; }
h1 { font-size: clamp(1.8rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.4rem, 3.5vw, 2.2rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.4rem); }

p { color: var(--text-muted); }

a { color: var(--cyan); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--cyan-light); }

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

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(5, 6, 15, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--space-border);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-logo .logo-k {
  background: linear-gradient(135deg, var(--orange), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  font-family: var(--font-body);
  letter-spacing: 0.02em;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: rgba(255,255,255,0.07);
}

.nav-links a.active { color: var(--cyan); }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-primary);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: var(--transition);
  margin: 4px 0;
}

/* Mobile menu open state */
.nav-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 640px) {
  .nav-toggle { display: flex; flex-direction: column; }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    background: rgba(5, 6, 15, 0.97);
    flex-direction: column;
    padding: 1rem;
    gap: 0.25rem;
    border-bottom: 1px solid var(--space-border);
    transform: translateY(-120%);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-links a { padding: 0.75rem 1rem; font-size: 1rem; border-radius: var(--radius-sm); }
}

/* --- Page wrapper --- */
.page-wrapper {
  padding-top: var(--nav-height);
  min-height: 100vh;
}

/* --- Sections --- */
.section { padding: 4rem 1.5rem; max-width: 1100px; margin: 0 auto; }
.section-sm { padding: 3rem 1.5rem; max-width: 1100px; margin: 0 auto; }

.section-title {
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.section-title h2 { color: var(--text-primary); }

.section-title .title-badge {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: rgba(0, 229, 255, 0.1);
  color: var(--cyan);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(0, 229, 255, 0.25);
  white-space: nowrap;
}

/* --- Cards --- */
.card {
  background: var(--space-card);
  border: 1px solid var(--space-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.03) 0%, transparent 60%);
  pointer-events: none;
}

.card:hover {
  border-color: rgba(0, 229, 255, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 229, 255, 0.08);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-weight: 800;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
  letter-spacing: 0.02em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--orange), #e64a19);
  color: white;
  box-shadow: 0 4px 20px rgba(255, 112, 67, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255, 112, 67, 0.5);
  color: white;
}

.btn-secondary {
  background: rgba(0, 229, 255, 0.1);
  color: var(--cyan);
  border: 1px solid rgba(0, 229, 255, 0.3);
}

.btn-secondary:hover {
  background: rgba(0, 229, 255, 0.18);
  color: var(--cyan-light);
  transform: translateY(-2px);
}

/* --- Tag / Badge --- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
}

.tag-orange { background: rgba(255,112,67,0.12); color: var(--orange-light); border: 1px solid rgba(255,112,67,0.25); }
.tag-cyan   { background: rgba(0,229,255,0.10); color: var(--cyan);         border: 1px solid rgba(0,229,255,0.25); }
.tag-yellow { background: rgba(255,214,0,0.10); color: var(--yellow);        border: 1px solid rgba(255,214,0,0.25); }
.tag-purple { background: rgba(124,77,255,0.12); color: #b39ddb;             border: 1px solid rgba(124,77,255,0.25); }

/* --- Glow text utility --- */
.glow-orange { color: var(--orange); text-shadow: 0 0 24px rgba(255,112,67,0.5); }
.glow-cyan   { color: var(--cyan);   text-shadow: 0 0 24px rgba(0,229,255,0.4); }

/* --- Divider --- */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--space-border), transparent);
  margin: 2rem 0;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--space-border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  font-family: var(--font-body);
}

.footer a { color: var(--text-muted); }
.footer a:hover { color: var(--cyan); }

/* --- Floating comet decoration --- */
.comet {
  position: absolute;
  width: 2px;
  height: 80px;
  background: linear-gradient(180deg, var(--cyan), transparent);
  border-radius: 2px;
  opacity: 0.4;
  animation: cometFall linear infinite;
  pointer-events: none;
}

@keyframes cometFall {
  0%   { transform: translateY(-120px) rotate(15deg); opacity: 0; }
  10%  { opacity: 0.4; }
  90%  { opacity: 0.4; }
  100% { transform: translateY(calc(100vh + 120px)) rotate(15deg); opacity: 0; }
}

/* --- Utility --- */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-2 { gap: 1rem; }
.flex-wrap { flex-wrap: wrap; }

/* --- Animations --- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-10px); }
}

@keyframes pulse-ring {
  0%   { box-shadow: 0 0 0 0 rgba(0, 229, 255, 0.35); }
  70%  { box-shadow: 0 0 0 14px rgba(0, 229, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 229, 255, 0); }
}

.animate-fadeup { animation: fadeUp 0.6s ease forwards; }
.animate-float  { animation: float 4s ease-in-out infinite; }

/* --- Scroll reveal (JS-driven) --- */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Stagger delays */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* --- Avatar placeholder --- */
.avatar-placeholder {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--orange), var(--cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 900;
  color: white;
  animation: pulse-ring 2.5s infinite;
  margin: 0 auto;
  flex-shrink: 0;
}

/* --- Custom Rocket Cursor --- */
html, body, * { cursor: none !important; }

#cursor-rocket {
  position: fixed;
  pointer-events: none;
  z-index: 99999;
  font-size: 1.6rem;
  left: -100px;
  top: -100px;
  transform: translate(-50%, -50%) rotate(-45deg);
  user-select: none;
  will-change: left, top, transform;
  line-height: 1;
}

.cursor-trail {
  position: fixed;
  pointer-events: none;
  z-index: 99998;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  animation: trailFade 0.5s ease-out forwards;
  will-change: opacity, transform;
}

.click-particle {
  position: fixed;
  pointer-events: none;
  z-index: 99997;
  border-radius: 50%;
  animation: particleBurst 0.65s ease-out forwards;
  will-change: opacity, transform;
}

@keyframes trailFade {
  0%   { opacity: 0.9; transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 0;   transform: translate(-50%, -50%) scale(0.1); }
}

@keyframes particleBurst {
  0%   { opacity: 1; transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 0; transform: translate(calc(-50% + var(--tx, 0px)), calc(-50% + var(--ty, 0px))) scale(0.2); }
}

/* --- Responsive helpers --- */
@media (max-width: 768px) {
  .section { padding: 3rem 1.25rem; }
  .card-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .section { padding: 2.5rem 1rem; }
  .btn { padding: 0.65rem 1.25rem; font-size: 0.85rem; }
}