:root {
  /* Light theme (default) */
  --bg: #f7f9fc;
  --card: #ffffff;
  --text: #0b0f14;
  --muted: #52607a;
  --accent: #4f8cff;
  --accent-2: #22c55e;
  --danger: #dc2626;
  --border: #dde3ea;
  --hover: #eef2f8;
  --input-bg: #ffffff;
  --input-border: #cfd8e3;
  --badge-bg: #eef2f8;
  --header-bg: rgba(255,255,255,0.7);
  --aquasky: #67e8f9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f14;
    --card: #121821;
    --text: #e7edf4;
    --muted: #a8b2c1;
    --accent: #4f8cff;
    --accent-2: #22c55e;
    --danger: #ef4444;
    --border: #1f2530;
    --hover: #121621;
    --input-bg: #101720;
    --input-border: #223046;
    --badge-bg: #1b2432;
    --header-bg: rgba(11,15,20,0.7);
    --aquasky: #67e8f9;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, Noto Sans, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
}

/* Subtle light texture for light mode */
@media (prefers-color-scheme: light) {
  body {
    background-image:
      radial-gradient(1200px 600px at 10% 0%, rgba(79,140,255,0.08) 0%, rgba(79,140,255,0.0) 60%),
      radial-gradient(900px 500px at 90% 70%, rgba(127, 235, 166, 0.08) 0%, rgba(34,197,94,0.0) 60%);
    background-repeat: no-repeat;
  }
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--header-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.2px;
  font-size: 1.2rem;
}
.nav { display: flex; gap: 16px; }
.nav-link {
  color: var(--muted);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 8px;
}
.nav-link:hover { color: var(--text); background: var(--hover); }

.site-footer {
  margin-top: 60px;
  border-top: 1px solid var(--border);
}
.footer-inner { padding: 24px 0; color: var(--muted); font-size: 0.95rem; }

main { padding: 32px 0; }

/* Decorative background canvas */
#bg {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  opacity: 0.45;
}

/* Hide canvas in light mode */
@media (prefers-color-scheme: light) { #bg { display: none; } }

/* Ensure content layers above the background */
main, .site-footer { position: relative; z-index: 1; }

.hero {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 24px;
  align-items: center;
}
.hero h1 { font-size: 2.2rem; margin: 0 0 10px; }
.hero p { color: var(--muted); margin: 0 0 16px; }
.hero .cta { display: inline-block; background: var(--accent); color: white; padding: 10px 16px; border-radius: 10px; text-decoration: none; font-weight: 600; }
.hero .cta:hover { filter: brightness(1.1); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}
.card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.card .meta { color: var(--muted); font-size: 0.9rem; margin-bottom: 8px; }
.card .actions { display: flex; gap: 10px; }
.actions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.form .actions { margin-top: 8px; }
.btn { 
  display: inline-block; 
  text-decoration: none; 
  padding: 8px 12px; 
  border-radius: 8px; 
  font-weight: 600; 
  position: relative; 
  overflow: hidden; 
  transition: background-color 250ms ease, filter 250ms ease, transform 250ms ease;
}
.btn.primary { background: var(--accent); color: white; }
.btn.secondary { background: #1a2230; color: var(--text); }
.btn.success { background: var(--accent-2); color: white; }
.btn.danger { background: var(--danger); color: white; }
.btn.aquasky { background: var(--aquasky); color: #0b0f14; }
.btn:hover { filter: brightness(1.06); }

/* Sliding light overlay on hover */
.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(255,255,255,0.0) 0%, rgba(255,255,255,0.25) 50%, rgba(255,255,255,0.0) 100%);
  transform: translateX(-120%);
  transition: transform 400ms ease;
}
.btn:hover::before { transform: translateX(120%); }

/* Accessible focus styles */
.btn:focus-visible { outline: 2px solid #93c5fd; outline-offset: 2px; }

.controls { display: flex; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.input, select, textarea {
  background: var(--input-bg);
  color: var(--text);
  border: 1px solid var(--input-border);
  border-radius: 10px;
  padding: 10px 12px;
}
.input::placeholder { color: #7c8aa0; }

textarea { min-height: 120px; resize: vertical; }

.notice {
  background: #102318;
  border: 1px solid #1e3a2a;
  color: #d1fae5;
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 12px;
}

.form {
  display: grid;
  gap: 12px;
  max-width: 560px;
}
.label { font-weight: 600; }
.field { display: grid; gap: 8px; }

.badge { display: inline-block; background: var(--badge-bg); color: var(--muted); padding: 4px 8px; border-radius: 99px; font-size: 0.85rem; }
.tags { display: flex; gap: 8px; flex-wrap: wrap; }

.detail { display: grid; gap: 14px; }
.detail h2 { margin: 0; }

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
}

/* Codsoft-inspired styles */
.hero-banner {
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  border-radius: 16px;
  padding: 60px 20px;
  text-align: center;
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
}
.hero-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="40" fill="rgba(255,255,255,0.05)"/></svg>');
  opacity: 0.3;
}
.hero-content { position: relative; z-index: 1; max-width: 800px; }
.hero-title { font-size: 3rem; font-weight: 700; color: white; margin: 0 0 16px; line-height: 1.2; }
.hero-subtitle { font-size: 1.5rem; color: rgba(255,255,255,0.95); margin: 0 0 32px; }
.cta-large { display: inline-block; background: white; color: var(--accent); padding: 16px 40px; border-radius: 50px; text-decoration: none; font-weight: 700; font-size: 1.1rem; box-shadow: 0 8px 16px rgba(0,0,0,0.2); transition: transform 250ms ease, box-shadow 250ms ease; }
.cta-large:hover { transform: translateY(-2px); box-shadow: 0 12px 24px rgba(0,0,0,0.3); }

.section-title { font-size: 2.2rem; font-weight: 700; text-align: center; margin: 0 0 16px; }
.section-desc { text-align: center; color: var(--muted); max-width: 700px; margin: 0 auto 32px; font-size: 1.05rem; }
.who-we-are { background: var(--card); border-radius: 16px; padding: 40px; }
.highlight-card { background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%); color: white; }
.highlight-card h3 { color: white; }

.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
.service-card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 32px 24px; text-align: center; transition: transform 250ms ease, box-shadow 250ms ease; }
.service-card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(79,140,255,0.15); }
.service-icon { font-size: 3rem; margin-bottom: 16px; }
.service-card h3 { margin: 0 0 12px; font-size: 1.2rem; }
.service-card p { color: var(--muted); margin: 0; }

.internships-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 20px; }
.internship-card { background: var(--card); border: 2px solid var(--border); border-radius: 12px; padding: 28px 20px; text-align: center; transition: border-color 250ms ease, transform 250ms ease; }
.internship-card:hover { border-color: var(--accent); transform: scale(1.02); }
.internship-card h3 { margin: 0 0 16px; font-size: 1.15rem; }

.community-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; margin-top: 32px; }
.stat-card { background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%); border-radius: 12px; padding: 32px 20px; text-align: center; color: white; }
.stat-value { font-size: 3rem; font-weight: 700; margin-bottom: 8px; }
.stat-label { font-size: 1rem; opacity: 0.95; }

.contact-form { max-width: 600px; margin: 0 auto; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 600px) { .form-row { grid-template-columns: 1fr; } }

.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 32px; padding: 48px 0 24px; }
.footer-col h4 { margin: 0 0 16px; font-size: 1.1rem; }
.footer-col p { color: var(--muted); margin: 8px 0; }
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin: 8px 0; }
.footer-links a { color: var(--muted); text-decoration: none; transition: color 200ms; }
.footer-links a:hover { color: var(--text); }
.social-icons { display: flex; gap: 12px; margin-bottom: 16px; font-size: 1.5rem; }
.social-icons a { transition: transform 200ms; }
.social-icons a:hover { transform: scale(1.2); }
.subscribe-box p { font-size: 0.9rem; margin-bottom: 8px; }
.subscribe-input { width: 100%; margin-bottom: 8px; }
.subscribe-btn { width: 100%; }
.footer-bottom { text-align: center; padding: 24px 0; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.9rem; }

@media (max-width: 860px) {
  .hero-title { font-size: 2rem; }
  .hero-subtitle { font-size: 1.2rem; }
}