/* ===============================
   BASE TYPOGRAPHY
================================ */
body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: #f5f6f8;
  color: #1f2937;
  -webkit-font-smoothing: antialiased;
  font-size: 15.5px;
}

/* Headings – bold & confident */
h1 {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 15px;
}

h2 {
  font-size: 25px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

h3, h4 {
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #111;
}

/* Text */
p, li {
  font-size: 15.5px;
  line-height: 1.75;
  color: #374151;
}

/* ===============================
   LAYOUT
================================ */
.doc-wrapper {
  display: flex;
  height: 100vh;
}

/* ===============================
   SIDEBAR – HEAVY & STYLISH
================================ */
.sidebar {
  width: 300px;
  background: linear-gradient(180deg, #1c1c2e, #151523);
  color: #ffffff;
  padding: 18px 14px;
  overflow-y: auto;
  box-shadow: 3px 0 18px rgba(0,0,0,0.2);
}

/* Sidebar title */
.sidebar h2 {
  text-align: center;
  font-size: 25px;
  font-weight: 800;
  letter-spacing: 0.5px;
  margin-bottom: 18px;
}

/* Accordion button */
.accordion {
  background: #26263f;
  color: #fff;
  cursor: pointer;
  padding: 14px 14px;
  border: none;
  width: 100%;
  text-align: left;
  margin-top: 6px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.3px;
  transition: all 0.25s ease;
}

.accordion:hover {
  background: #32325a;
}

/* ===============================
   SIDEBAR LINKS
================================ */
/* Accordion-style links inside panel */
.panel a {
  display: block;
  background: #26263f;
  color: #ffffff;
  padding: 12px 14px;
  margin-top: 6px;
  font-size: 15.5px;
  font-weight: 700;
  text-decoration: none;
  border-radius: 8px;
  letter-spacing: 0.3px;
  transition: all 0.25s ease;
}

/* Hover effect */
.panel a:hover {
  background: #32325a;
  padding-left: 18px;
}

/* Active / current page */
.panel a.active {
  background: linear-gradient(135deg, #4f46e5, #4338ca);
  color: #ffffff;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.15);
}
/* ===============================
   CONTENT AREA
================================ */
.content {
  flex: 1;
  padding: 35px 40px;
  overflow-y: auto;
  background: #ffffff;
}

/* ===============================
   IMAGES
================================ */
.install-img {
  width: 100%;
  max-width: 720px;
  height: 400px;
  object-fit: cover;
  border-radius: 12px;
  margin-top: 14px;
  display: block;
  box-shadow: 0 8px 22px rgba(0,0,0,0.15);
}

.install-img-wrapper {
  text-align: center;
}

/* ===============================
   VIDEO EMBED
================================ */
.video {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  margin-top: 25px;
  border-radius: 14px;
  box-shadow: 0 10px 26px rgba(0,0,0,0.2);
}

.video iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
/* INTRO LOGO */
.intro-logo {
  text-align: center;
  margin-bottom: 20px;
}

.intro-logo img {
  width: 400px;
  height: auto;
}

/* INTRO IMAGE */
.intro-image {
  text-align: center;
  margin-top: 20px;
}

.intro-image img {
  width: 100%;
  max-width: 1000px;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}