/* Reset */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  background-color: #ffffff;
  color: #222;
}

/* Container */
.features-container {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

/* Headings */
h1 {
  font-size: 2rem;
  margin-bottom: 0.4em;
}

h2 {
  font-size: 1.3rem;
  margin-top: 2em;
  color: #111;
}

/* Paragraphs and lists */
p,
li {
  margin-bottom: 0.8em;
}

ul {
  padding-left: 1.2em;
}

ol {
  padding-left: 1.2em;
  margin-bottom: 1.5em;
}

.meta {
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 2em;
}

/* Footer */
footer {
  margin-top: 4em;
  font-size: 0.9rem;
  color: #666;
  text-align: left;
  padding-bottom: 40px;
}

/* Header */
.app-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  background: #ffffff;
  border-bottom: 1px solid #e6e8eb;
  z-index: 100;
}

/* Left */
.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo {
  width: 28px;
  height: 28px;
}

.brand-name {
  font-size: 18px;
  font-weight: 600;
  color: #111;
}

/* Center nav */
.header-center {
  display: flex;
  gap: 28px;
}

.header-center a {
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  color: #888;
  position: relative;
  padding: 4px 0;
}

.header-center a.active {
  color: #111;
}

.header-center a:hover {
  color: #444;
}

.header-center a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: #111;
  transition: width 0.2s ease;
}

.header-center a:hover::after {
  width: 100%;
}

/* Right */
.header-right {
  display: flex;
  align-items: center;
}

.app-button {
  background: #111;
  color: #fff;
  border: none;
  text-decoration: none;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.1s ease;
}

.app-button:hover {
  background: #000;
  transform: translateY(-1px);
}

/* Sections */
section {
  margin-bottom: 3em;
}

/* Roadmap list styling */
ol li {
  margin-bottom: 1em;
  padding-left: 12px;
  border-left: 2px solid #111;
}

ol li strong {
  color: #111;
}

/* Links */
a {
  color: #111;
  text-decoration: underline;
}

a:hover {
  color: #000;
  text-decoration: none;
}

/* Responsive */
@media (max-width: 768px) {
  .header-center {
    display: none;
  }

  .features-container {
    margin: 20px auto;
    padding: 0 15px;
  }
}

/* Features grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 24px;
}

.feature-card {
  border: 1px solid #e6e8eb;
  border-radius: 12px;
  padding: 20px;
  background: #fff;
}

.feature-card img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 14px;
  display: block;
}

.feature-card h3 {
  font-size: 1rem;
  margin-bottom: 0.4em;
  color: #111;
}

.feature-card p {
  font-size: 0.95rem;
  color: #444;
  margin: 0;
}

/* Mobile */
@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}