/* ==========================================
   AtCoder Workspace Pages & Articles - Shared Stylesheet (site.css)
   ========================================== */

:root {
  --bg-dark: #222222;
  --text-dark-muted: #9d9d9d;
  --text-dark-link: #cccccc;
  --text-dark-hover: #ffffff;
  --brand-green: #5cb85c;
  --btn-primary: #337ab7;
  --btn-primary-hover: #286090;
  --border-light: #eeeeee;
  --border-dark: #333333;
  --font-family: "Helvetica Neue", Helvetica, Arial, "Meiryo", sans-serif;
  --font-mono: Monaco, Menlo, Consolas, "Courier New", monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
}

body {
  font-family: var(--font-family);
  color: #333333;
  background-color: #f9f9f9;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Base Container */
.container {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 15px;
  flex: 1;
}

/* Page Header */
.page-header {
  padding-bottom: 12px;
  margin: 30px 0 24px 0;
  border-bottom: 1px solid var(--border-light);
}

.page-header h1 {
  font-size: 26px;
  font-weight: 700;
  color: #222222;
}

.page-header h1 small {
  font-size: 16px;
  color: #777777;
  font-weight: normal;
  margin-left: 10px;
}

/* ==========================================
   Shared Sticky Navbar
   ========================================== */
.navbar {
  background-color: var(--bg-dark);
  min-height: 50px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.navbar-brand {
  color: var(--text-dark-muted);
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.navbar-brand::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--brand-green);
  border-radius: 50%;
}

.navbar-brand:hover {
  color: var(--text-dark-hover);
}

.navbar-links {
  display: flex;
  gap: 8px;
}

.nav-link {
  color: var(--text-dark-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s, background-color 0.2s;
  padding: 6px 12px;
  border-radius: 4px;
}

.nav-link:hover {
  color: var(--text-dark-hover);
}

.nav-link.active {
  color: var(--text-dark-hover);
  font-weight: bold;
  background-color: rgba(255, 255, 255, 0.08);
}

/* ==========================================
   Shared Full-Width Footer (Outside Container)
   ========================================== */
footer {
  background-color: var(--bg-dark);
  color: var(--text-dark-muted);
  padding: 24px 15px;
  margin-top: 60px;
  font-size: 13px;
  text-align: center;
  border-top: 1px solid var(--border-dark);
  width: 100%;
}

footer p {
  margin: 0;
  line-height: 1.8;
}

footer a {
  color: var(--text-dark-link);
  text-decoration: none;
  margin: 0 6px;
  transition: color 0.2s;
}

footer a:hover {
  color: var(--text-dark-hover);
  text-decoration: underline;
}

/* Responsive Navbar */
@media (max-width: 650px) {
  .navbar {
    flex-direction: column;
    padding: 10px 15px;
    gap: 8px;
  }

  .navbar-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px;
  }

  .nav-link {
    font-size: 13px;
    padding: 4px 8px;
  }
}