:root {
  --bg: #ffffff;
  --text: #111111;
  --subtle: #666666;
  --accent: #0f7a3a;        /* Refined matrix green */
  --accent-soft: #e6f4ec;   /* Soft green tint */
  --card: #f7f9fc;
  --max-width: 1100px;
}

body.dark {
  --bg: #0d1117;
  --text: #f0f6fc;
  --subtle: #8b949e;
  --accent: #2ecc71;        /* Slightly brighter green for dark */
  --accent-soft: #16261c;
  --card: #161b22;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background:
    linear-gradient(to right, rgba(15,122,58,0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15,122,58,0.04) 1px, transparent 1px),
    var(--bg);
  background-size: 40px 40px;
  color: var(--text);
  line-height: 1.6;
  transition: background 0.3s ease, color 0.3s ease;
}

/* NAV */

.navbar {
  position: sticky;
  top: 0;
  background: var(--bg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.navbar nav a {
  margin-left: 24px;
  text-decoration: none;
  font-weight: 500;
  color: var(--text);
  transition: opacity 0.2s ease;
}

.navbar nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

.navbar nav a:hover {
  color: var(--accent);
}

#theme-toggle {
  margin-left: 20px;
  cursor: pointer;
  background: none;
  border: none;
  font-size: 16px;
}

/* HERO */

.hero {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width);
  margin: 120px auto;
  padding: 0 40px;
  gap: 60px;
}

.hero h1 {
  font-size: 48px;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero p {
  font-size: 18px;
  max-width: 550px;
}

.hero .subtle {
  margin-top: 12px;
  color: var(--subtle);
  font-size: 16px;
}

.hero img {
  width: 240px;
  border-radius: 12px;
}

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

/* SECTIONS */

.section {
  max-width: var(--max-width);
  margin: 120px auto;
  padding: 0 40px;
}

.section h2 {
  font-size: 32px;
  margin-bottom: 40px;
  position: relative;
}

.section h2::after {
  content: "";
  display: block;
  width: 40px;
  height: 3px;
  background: var(--accent);
  margin-top: 10px;
}

/* PROJECTS */

.project {
  background: var(--card);
  padding: 40px;
  border-radius: 14px;
  margin-bottom: 60px;
  transition: transform 0.2s ease;
}

.project:hover {
  transform: translateY(-4px);
}

.project h3 {
  margin-top: 0;
  font-size: 24px;
}

.project ul {
  padding-left: 20px;
}

.project h3 {
  position: relative;
  display: inline-block;
  cursor: default;
}

.project:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(15,122,58,0.08);
}

.project h3::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0%;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
}

.project:hover h3::after {
  width: 100%;
}

iframe {
  margin-top: 20px;
  width: 100%;
  height: 380px;
  border-radius: 12px;
  border: none;
}

/* VPS STACK VISUAL */

.deployment-card {
  margin-top: 25px;
  padding: 25px;
  background: var(--bg);
  border-radius: 12px;
  border: 1px solid var(--accent-soft);
}

.deployment-layer {
  padding: 12px 18px;
  margin-bottom: 10px;
  border-left: 4px solid var(--accent);
  background: var(--card);
  font-size: 14px;
  border-radius: 6px;
}

/* EXPANDABLE */

.expand-btn {
  margin-top: 20px;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 8px 14px;
  cursor: pointer;
  border-radius: 6px;
  font-size: 14px;
  transition: background 0.2s ease;
}

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

.expand-content {
  display: none;
  margin-top: 15px;
  font-size: 15px;
  color: var(--subtle);
}

/* FADE-IN ANIMATION */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* RESPONSIVE */

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 ratio */
  height: 0;
  margin-top: 20px;
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 12px;
}

@media (max-width: 900px) {
  .navbar {
    padding: 16px 24px;
  }

  .navbar nav a {
    margin-left: 16px;
  }

  .hero {
    margin: 72px auto;
    padding: 0 24px;
    gap: 30px;
    flex-direction: column;
    align-items: flex-start;
  }

  .hero h1 {
    font-size: 38px;
  }

  .hero p {
    font-size: 17px;
    max-width: 100%;
  }

  .section {
    margin: 84px auto;
    padding: 0 24px;
  }

  .section h2 {
    font-size: 28px;
    margin-bottom: 30px;
  }

  .project {
    padding: 28px;
    margin-bottom: 40px;
  }

  iframe {
    height: 320px;
  }
}

@media (max-width: 640px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 16px;
  }

  .navbar nav {
    width: 100%;
    gap: 8px 14px;
  }

  .navbar nav a {
    margin-left: 0;
    font-size: 14px;
  }

  #theme-toggle {
    margin-left: 0;
  }

  .hero {
    margin: 52px auto;
    padding: 0 16px;
    gap: 20px;
  }

  .hero h1 {
    font-size: 30px;
    line-height: 1.25;
    margin-bottom: 14px;
  }

  .hero p {
    font-size: 16px;
  }

  .hero .subtle {
    font-size: 15px;
  }

  .section {
    margin: 64px auto;
    padding: 0 16px;
  }

  .section h2 {
    font-size: 24px;
  }

  .project {
    padding: 20px;
    border-radius: 10px;
  }

  .project h3 {
    font-size: 20px;
  }

  .deployment-card {
    padding: 16px;
  }

  .deployment-layer {
    padding: 10px 12px;
    font-size: 13px;
  }
}