/* ==========================================================================
   WebDev Training Design System - Shared Stylesheet
   Consistent with portal.html design tokens, typography, and UI components
   ========================================================================== */

:root {
  --ink: #19243a;
  --ink-light: #334155;
  --muted: #64748b;
  --line: #e2e8f0;
  --line-subtle: #f1f5f9;
  --paper: #ffffff;
  --canvas: #f8fafc;
  --accent: #5146d9;
  --accent-hover: #4338ca;
  --accent-soft: #eef2ff;
  --accent-border: #c7d2fe;
  --green: #0f766e;
  --green-hover: #0d655e;
  --green-soft: #f0fdf4;
  --green-border: #bbf7d0;
  --amber: #b45309;
  --amber-soft: #fffbeb;
  --amber-border: #fde68a;
  --rose: #e11d48;
  --rose-soft: #fff1f2;
  --rose-border: #fecdd3;
  --navy: #0f172a;
  --navy-surface: #1e293b;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.07);
  --shadow-lg: 0 16px 36px -8px rgba(15, 23, 42, 0.12);
  --font: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  background: var(--canvas);
  color: var(--ink);
  font: 14.5px/1.65 var(--font);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button, input, select, textarea { font: inherit; }
button, a, input, select, textarea { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; color: inherit; border: none; background: transparent; }
button:disabled { cursor: not-allowed; opacity: 0.55; }
a { color: var(--accent); text-decoration: none; transition: color .15s ease, background-color .15s ease, border-color .15s ease; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
p + p { margin-top: 12px; }
h1, h2, h3, h4, h5, h6 { color: var(--ink); line-height: 1.25; font-weight: 700; }
h1, h2 { letter-spacing: -0.035em; }
h3, h4 { letter-spacing: -0.02em; }
ul, ol { padding-left: 20px; }
li + li { margin-top: 6px; }

::selection {
  background: #c7d2fe;
  color: #1e1b4b;
}

:focus-visible {
  outline: 3px solid #818cf8;
  outline-offset: 3px;
}

/* Skip link */
.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  background: var(--navy);
  color: white;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-weight: 600;
  transition: top .2s ease;
}
.skip-link:focus {
  top: 16px;
}

/* SVG Icon System */
svg.icon {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
  vertical-align: middle;
}

/* ==========================================================================
   Navigation Bar (Top Bar)
   ========================================================================== */
.site-navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
}

.nav-container {
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none !important;
}

.brandmark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--accent);
  color: white;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(81, 70, 217, 0.25);
  flex-shrink: 0;
}
.brandmark .icon { width: 22px; height: 22px; }

.brand-text {
  display: flex;
  flex-direction: column;
}
.brand-text strong {
  font-size: 19px;
  letter-spacing: -0.5px;
  line-height: 1.1;
  color: var(--ink);
}
.brand-text small {
  font-size: 9.5px;
  color: var(--muted);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--ink-light);
  font-size: 13.5px;
  font-weight: 600;
  text-decoration: none;
  transition: all .15s ease;
}
.nav-links a:hover {
  background: var(--line-subtle);
  color: var(--ink);
  text-decoration: none;
}
.nav-links a.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
}

.nav-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 6px;
  background: #e2e8f0;
  color: var(--ink-light);
}
.nav-links a.active .nav-badge {
  background: #c7d2fe;
  color: var(--accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  width: 36px;
  height: 36px;
  background: var(--accent-soft);
  border: 1px solid var(--accent-border);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 750;
  color: var(--accent);
  text-decoration: none !important;
  transition: all .15s ease;
}
.avatar:hover {
  background: #e0e7ff;
  transform: scale(1.05);
}

.menu-toggle {
  display: none;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  background: white;
  border-radius: var(--radius-sm);
  color: var(--ink);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 8px 18px;
  background: white;
  font-size: 13px;
  font-weight: 650;
  color: var(--ink);
  line-height: 1.4;
  text-align: center;
  cursor: pointer;
  transition: all .15s ease;
  text-decoration: none !important;
  white-space: nowrap;
}
.btn:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  color: var(--ink);
}
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white !important;
  box-shadow: 0 2px 8px rgba(81, 70, 217, 0.25);
}
.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 4px 14px rgba(81, 70, 217, 0.35);
}
.btn-dark {
  background: var(--navy);
  border-color: var(--navy);
  color: white !important;
}
.btn-dark:hover {
  background: var(--navy-surface);
  border-color: var(--navy-surface);
}
.btn-outline-accent {
  background: white;
  border-color: var(--accent-border);
  color: var(--accent) !important;
}
.btn-outline-accent:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.btn-small {
  padding: 5px 12px;
  min-height: 32px;
  font-size: 12px;
  border-radius: 6px;
}
.btn-lg {
  min-height: 46px;
  padding: 10px 22px;
  font-size: 14.5px;
  border-radius: 10px;
}

/* ==========================================================================
   Badges & Tags
   ========================================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  padding: 3px 9px;
  border-radius: 6px;
  font-weight: 650;
  border: 1px solid transparent;
  line-height: 1.4;
}
.badge-accent {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent-border);
}
.badge-green {
  background: var(--green-soft);
  color: var(--green);
  border-color: var(--green-border);
}
.badge-amber {
  background: var(--amber-soft);
  color: var(--amber);
  border-color: var(--amber-border);
}
.badge-gray {
  background: #f1f5f9;
  color: #475569;
  border-color: #e2e8f0;
}
.unit-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  color: #334155;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 6px;
  font-weight: 600;
  letter-spacing: 0.3px;
}

/* ==========================================================================
   Cards & Panels
   ========================================================================== */
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card-hoverable:hover {
  transform: translateY(-2px);
  border-color: #cbd5e1;
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-subtle);
}

.card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Icon Box */
.icon-box {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.icon-box-accent { background: var(--accent-soft); color: var(--accent); }
.icon-box-green  { background: var(--green-soft); color: var(--green); }
.icon-box-amber  { background: var(--amber-soft); color: var(--amber); }
.icon-box-navy   { background: var(--navy); color: white; }

/* Callout Box */
.callout {
  padding: 16px 20px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #f8fafc;
  display: flex;
  gap: 14px;
  margin: 16px 0;
}
.callout-accent {
  background: var(--accent-soft);
  border-color: var(--accent-border);
  color: #312e81;
}
.callout-green {
  background: var(--green-soft);
  border-color: var(--green-border);
  color: #064e3b;
}
.callout-amber {
  background: var(--amber-soft);
  border-color: var(--amber-border);
  color: #78350f;
}

/* ==========================================================================
   Code & Terminal Box
   ========================================================================== */
.editor-box {
  background: #111827;
  color: #e2e8f0;
  border: 1px solid #1f2937;
  border-radius: var(--radius);
  box-shadow: 0 12px 28px -8px rgba(15, 23, 42, 0.35);
  overflow: hidden;
  font-family: var(--font-mono);
}
.editor-top {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-bottom: 1px solid #1f2937;
  font-size: 11px;
  color: #9ca3af;
  background: #0f172a;
}
.editor-dots {
  display: flex;
  gap: 6px;
  margin-right: 8px;
}
.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}
.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.editor-code {
  padding: 16px 18px;
  font-size: 12.5px;
  line-height: 1.8;
  overflow-x: auto;
}
.editor-code pre {
  margin: 0;
  font-family: inherit;
  font-size: inherit;
}
.tok-cmd { color: #6ee7b7; font-weight: 600; }
.tok-param { color: #93c5fd; }
.tok-comment { color: #6b7280; font-style: italic; }
.tok-kw { color: #c084fc; font-weight: 600; }

code.inline-code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: #f1f5f9;
  color: #475569;
  border: 1px solid var(--line);
  padding: 2px 6px;
  border-radius: 4px;
}

/* ==========================================================================
   Progress Bar
   ========================================================================== */
.progress-track {
  height: 7px;
  background: #e2e8f0;
  border-radius: 99px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 99px;
  transition: width .5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   Breadcrumb
   ========================================================================== */
.breadcrumb {
  font-size: 12.5px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}
.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}
.breadcrumb a:hover {
  color: var(--accent);
  text-decoration: underline;
}
.breadcrumb .separator {
  color: #cbd5e1;
}
.breadcrumb strong {
  color: var(--ink);
  font-weight: 650;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: white;
  border-top: 1px solid var(--line);
  padding: 40px 24px;
  margin-top: 60px;
}
.footer-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line-subtle);
}
.footer-nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-nav a {
  color: var(--muted);
  font-size: 13px;
  font-weight: 550;
}
.footer-nav a:hover {
  color: var(--accent);
  text-decoration: none;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12.5px;
  color: var(--muted);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 900px) {
  .nav-links {
    display: none;
  }
  .menu-toggle {
    display: grid;
  }
  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid var(--line);
    padding: 16px 24px;
    box-shadow: var(--shadow-lg);
    gap: 8px;
  }
  .nav-links.mobile-open a {
    width: 100%;
    padding: 10px 14px;
  }
}

@media (max-width: 640px) {
  .site-navbar {
    padding: 0 16px;
    height: 60px;
  }
  .brand-text strong {
    font-size: 17px;
  }
  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }
}