/* =============================================
   CSS Variables & Theme
   ============================================= */
:root {
  --bg:          #f8fafc;
  --bg-card:     #ffffff;
  --text:        #1e293b;
  --text-muted:  #64748b;
  --accent:      #6366f1;
  --accent-dark: #4f46e5;
  --border:      #e2e8f0;
  --shadow:      0 4px 24px rgba(99,102,241,.10);
  --radius:      1rem;
  --transition:  .25s ease;
}

[data-theme="dark"] {
  --bg:          #0f172a;
  --bg-card:     #1e293b;
  --text:        #f1f5f9;
  --text-muted:  #94a3b8;
  --accent:      #818cf8;
  --accent-dark: #6366f1;
  --border:      #334155;
  --shadow:      0 4px 24px rgba(0,0,0,.40);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
}

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

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

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* =============================================
   Navigation
   ============================================= */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .85rem 1.5rem;
  background: rgba(248,250,252,.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}

[data-theme="dark"] .nav {
  background: rgba(15,23,42,.85);
}

.nav__brand {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -.02em;
  color: var(--text);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav__links a {
  font-size: .9rem;
  font-weight: 500;
  color: var(--text-muted);
}
.nav__links a:hover,
.nav__links a.active { color: var(--accent); }

.nav__actions {
  display: flex;
  align-items: center;
  gap: .75rem;
}

/* Theme toggle button */
.theme-toggle {
  width: 2.25rem;
  height: 2.25rem;
  border: 1.5px solid var(--border);
  background: var(--bg-card);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: background var(--transition), border-color var(--transition), transform .15s;
}
.theme-toggle:hover { transform: scale(1.1); }

/* Mobile nav hamburger hidden on desktop */
.nav__mobile-toggle { display: none; }

/* =============================================
   Hero Section
   ============================================= */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 6rem 1.5rem 4rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 60% at 70% 40%, rgba(99,102,241,.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.hero__badge {
  display: inline-block;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(99,102,241,.10);
  padding: .35rem 1rem;
  border-radius: 2rem;
  margin-bottom: 1.5rem;
}

.hero__title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.1;
  margin-bottom: 1.25rem;
}

.hero__title span {
  color: var(--accent);
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto 2.5rem;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  background: var(--accent);
  color: #fff;
  padding: .85rem 2rem;
  border-radius: 2rem;
  font-weight: 600;
  font-size: 1rem;
  transition: background var(--transition), transform .15s, box-shadow .15s;
  box-shadow: 0 4px 16px rgba(99,102,241,.35);
}
.hero__cta:hover {
  color: #fff;
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99,102,241,.45);
}

/* =============================================
   Section common styles
   ============================================= */
.section {
  padding: 5rem 1.5rem;
}

.section__inner {
  max-width: 1100px;
  margin: 0 auto;
}

.section__label {
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .5rem;
}

.section__title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: 1rem;
}

.section__desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 540px;
  margin-bottom: 3rem;
}

/* =============================================
   Apps Section
   ============================================= */
.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.app-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  text-decoration: none;
  color: var(--text);
  display: block;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.app-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #a78bfa);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.app-card:hover {
  color: var(--text);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}
.app-card:hover::before { transform: scaleX(1); }

.app-card__icon {
  width: 3rem;
  height: 3rem;
  border-radius: .75rem;
  background: rgba(99,102,241,.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.app-card__name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: .4rem;
}

.app-card__desc {
  font-size: .9rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.app-card__link {
  font-size: .85rem;
  font-weight: 600;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: .35rem;
}

/* =============================================
   Tools Section
   ============================================= */
.tools-section { background: var(--bg-card); }

.tools-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.tool-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  text-decoration: none;
  color: var(--text);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.tool-item:hover {
  color: var(--text);
  border-color: var(--accent);
  transform: translateX(4px);
  box-shadow: var(--shadow);
}

.tool-item__icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: .6rem;
  background: rgba(99,102,241,.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.tool-item__info { flex: 1; }

.tool-item__name {
  font-weight: 600;
  font-size: .95rem;
}

.tool-item__sub {
  font-size: .82rem;
  color: var(--text-muted);
  margin-top: .1rem;
}

.tool-item__arrow {
  color: var(--text-muted);
  font-size: 1rem;
  transition: color var(--transition), transform var(--transition);
}
.tool-item:hover .tool-item__arrow {
  color: var(--accent);
  transform: translateX(3px);
}

/* =============================================
   About Section
   ============================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-avatar {
  width: 10rem;
  height: 10rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 1.5rem;
  box-shadow: 0 8px 32px rgba(99,102,241,.30);
}

.about-text p {
  color: var(--text-muted);
  font-size: 1.02rem;
  margin-bottom: 1rem;
}

.about-stack {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1.5rem;
}

.badge {
  display: inline-block;
  padding: .3rem .85rem;
  border-radius: 2rem;
  font-size: .8rem;
  font-weight: 600;
  border: 1.5px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
}

/* =============================================
   Contact Section
   ============================================= */
.contact-section { text-align: center; }

.contact-section .section__desc { margin-left: auto; margin-right: auto; }

.contact-cta {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  background: #2ca5e0;
  color: #fff;
  padding: 1rem 2.25rem;
  border-radius: 2rem;
  font-weight: 600;
  font-size: 1.05rem;
  transition: background var(--transition), transform .15s, box-shadow .15s;
  box-shadow: 0 4px 16px rgba(44,165,224,.35);
}
.contact-cta:hover {
  color: #fff;
  background: #1a91c6;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(44,165,224,.45);
}

.contact-cta__icon { font-size: 1.25rem; }

/* =============================================
   Footer
   ============================================= */
.footer {
  padding: 2rem 1.5rem;
  text-align: center;
  border-top: 1px solid var(--border);
  font-size: .85rem;
  color: var(--text-muted);
}

/* =============================================
   Responsive — Mobile
   ============================================= */
@media (max-width: 768px) {
  /* Nav links hidden on mobile */
  .nav__links { display: none; }

  .nav__mobile-toggle {
    display: flex;
    width: 2.25rem;
    height: 2.25rem;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: .5rem;
    cursor: pointer;
    font-size: 1.1rem;
  }

  /* Mobile nav drawer */
  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 60px;
    left: 0; right: 0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem;
    gap: 1.25rem;
    z-index: 99;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .about-left { text-align: center; }
  .about-left .about-avatar { margin-left: auto; margin-right: auto; }

  .section { padding: 3.5rem 1.25rem; }
}

@media (max-width: 480px) {
  .hero { padding: 5.5rem 1.25rem 3rem; }
  .apps-grid { grid-template-columns: 1fr; }
  .tools-list { grid-template-columns: 1fr; }
}