/* ==========================================================================
   mycloud.uno - Premium CSS Design System
   ========================================================================== */

/* Custom Font Import */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

:root {
  /* Fonts */
  --font-primary: 'Outfit', sans-serif;
  --font-secondary: 'Plus Jakarta Sans', sans-serif;

  /* Colors */
  --bg-primary: #050811;
  --bg-secondary: rgba(13, 20, 38, 0.65);
  --bg-tertiary: rgba(22, 34, 64, 0.8);
  --bg-glass: rgba(10, 17, 35, 0.45);
  --border-glass: rgba(255, 255, 255, 0.07);
  --border-focus: rgba(0, 242, 254, 0.4);

  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-inverse: #050811;

  --accent-cyan: #00f2fe;
  --accent-blue: #4facfe;
  --accent-purple: #8a2be2;
  --accent-green: #00f5a0;

  /* Gradients */
  --grad-primary: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-cyan) 100%);
  --grad-purple: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-blue) 100%);
  --grad-green: linear-gradient(135deg, var(--accent-green) 0%, #00d9f5 100%);
  --grad-dark: linear-gradient(180deg, #090e1a 0%, var(--bg-primary) 100%);
  --grad-text: linear-gradient(90deg, #00f2fe 0%, #4facfe 50%, #8a2be2 100%);

  /* Shadows & Filters */
  --shadow-glow: 0 0 25px rgba(0, 242, 254, 0.15);
  --shadow-purple-glow: 0 0 25px rgba(138, 43, 226, 0.25);
  --shadow-card: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --blur-glass: blur(16px);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  background-image: var(--grad-dark);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  position: relative;
}

/* Ambient Cloud Glow Background Blobs */
body::before, body::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  z-index: -1;
  filter: blur(120px);
  opacity: 0.25;
  pointer-events: none;
  animation: floatBlobs 20s infinite alternate ease-in-out;
}

body::before {
  background: var(--accent-blue);
  top: 10%;
  left: -100px;
}

body::after {
  background: var(--accent-purple);
  bottom: 10%;
  right: -100px;
  animation-delay: -5s;
}

@keyframes floatBlobs {
  0% {
    transform: translate(0, 0) scale(1);
  }
  100% {
    transform: translate(80px, 50px) scale(1.2);
  }
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header & Navbar */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 8, 17, 0.6);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border-bottom: 1px solid var(--border-glass);
  transition: var(--transition-smooth);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -0.5px;
}

.logo-cloud {
  font-size: 1.8rem;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-text {
  color: var(--text-main);
  font-family: var(--font-secondary);
}

.logo-ext {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition-smooth);
  font-size: 0.95rem;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--grad-primary);
  transition: var(--transition-smooth);
}

.nav-links a:hover {
  color: var(--text-main);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a.active {
  color: var(--text-main);
}

.btn-vps-guide {
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  padding: 0.6rem 1.2rem;
  border-radius: 50px;
  font-weight: 600;
  text-decoration: none;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-smooth);
}

.btn-vps-guide:hover {
  background: var(--grad-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
  border-color: transparent;
}

/* Hero Section */
.hero {
  padding: 5rem 0 3rem;
  text-align: center;
  position: relative;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
}

.hero-title span {
  background: var(--grad-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto 2.5rem;
  font-family: var(--font-secondary);
  font-weight: 300;
}

/* Search Bar (Dashboard) */
.search-container {
  max-width: 500px;
  margin: 0 auto 3rem;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 1.1rem 1.5rem 1.1rem 3.5rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: 100px;
  color: var(--text-main);
  font-size: 1rem;
  font-family: var(--font-primary);
  outline: none;
  transition: var(--transition-smooth);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
}

.search-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-glow);
  background: var(--bg-secondary);
}

.search-icon {
  position: absolute;
  left: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  font-size: 1.2rem;
}

/* Dashboard Categories & Course Grid */
.section-title {
  font-size: 1.75rem;
  margin-bottom: 2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 24px;
  background: var(--grad-primary);
  border-radius: 4px;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2.5rem;
  margin-bottom: 5rem;
}

/* Premium Course Card */
.course-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: 24px;
  padding: 2rem;
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
}

.course-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--grad-primary);
  opacity: 0;
  transition: var(--transition-smooth);
}

.course-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 242, 254, 0.2);
  box-shadow: var(--shadow-glow), 0 20px 40px rgba(0, 0, 0, 0.4);
}

.course-card:hover::before {
  opacity: 1;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

.course-badge {
  background: rgba(79, 172, 254, 0.1);
  border: 1px solid rgba(79, 172, 254, 0.2);
  color: var(--accent-cyan);
  padding: 0.35rem 0.8rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.course-icon {
  font-size: 2.5rem;
  line-height: 1;
}

.course-card-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-main);
  line-height: 1.3;
}

.course-card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  flex-grow: 1;
  font-family: var(--font-secondary);
}

/* Card Progress bar */
.card-progress-container {
  margin-bottom: 1.5rem;
}

.progress-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  margin-bottom: 0.5rem;
}

.progress-pct {
  color: var(--accent-cyan);
  font-weight: 700;
}

.progress-bar-bg {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--grad-primary);
  border-radius: 10px;
  transition: width 0.8s ease-in-out;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.card-footer-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-card-action {
  color: var(--accent-cyan);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: var(--transition-smooth);
}

.course-card:hover .btn-card-action {
  transform: translateX(3px);
}

/* ==========================================================================
   Course Viewer Layout (course.html)
   ========================================================================== */
.viewer-container {
  display: flex;
  min-height: calc(100vh - 80px);
  position: relative;
}

/* Sidebar Styling */
.sidebar {
  width: 320px;
  background: rgba(8, 12, 23, 0.85);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border-right: 1px solid var(--border-glass);
  padding: 2rem 1.5rem;
  overflow-y: auto;
  height: calc(100vh - 80px);
  position: sticky;
  top: 80px;
  transition: var(--transition-smooth);
  z-index: 50;
}

.sidebar-course-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-main);
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.sidebar-module {
  margin-bottom: 1.5rem;
}

.module-title {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.75px;
  margin-bottom: 0.75rem;
  font-weight: 700;
  font-family: var(--font-secondary);
}

.lesson-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.lesson-item-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.7rem 1rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 12px;
  color: var(--text-muted);
  text-align: left;
  font-family: var(--font-primary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.lesson-item-btn:hover {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-main);
}

.lesson-item-btn.active {
  background: rgba(0, 242, 254, 0.08);
  border-color: rgba(0, 242, 254, 0.15);
  color: var(--accent-cyan);
  font-weight: 600;
}

.lesson-check-icon {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1.5px solid var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  transition: var(--transition-smooth);
  flex-shrink: 0;
}

.lesson-item-btn.completed .lesson-check-icon {
  background: var(--accent-green);
  border-color: var(--accent-green);
  color: var(--text-inverse);
}

.lesson-item-btn.active .lesson-check-icon {
  border-color: var(--accent-cyan);
}

/* Main Content Panel */
.content-panel {
  flex-grow: 1;
  padding: 3rem 4rem;
  max-width: 900px;
  margin: 0 auto;
  overflow-y: auto;
}

/* Structured Article Elements */
.content-body {
  font-family: var(--font-secondary);
  font-weight: 400;
  font-size: 1.05rem;
  line-height: 1.75;
  color: #d1d5db;
}

.content-body h1, 
.content-body h2, 
.content-body h3 {
  font-family: var(--font-primary);
  color: var(--text-main);
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-weight: 700;
}

.content-body h2 {
  font-size: 1.8rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  padding-bottom: 0.5rem;
}

.content-body h3 {
  font-size: 1.3rem;
}

.content-body p {
  margin-bottom: 1.5rem;
}

.content-body ul, 
.content-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.75rem;
}

.content-body li {
  margin-bottom: 0.5rem;
}

/* Inline Code & Code Blocks */
.content-body code {
  font-family: 'Consolas', 'Courier New', Courier, monospace;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9rem;
  color: var(--accent-cyan);
}

.content-body pre {
  background: #090e1a;
  border: 1px solid var(--border-glass);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  overflow-x: auto;
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.8);
}

.content-body pre code {
  background: transparent;
  padding: 0;
  color: #e5e7eb;
  font-size: 0.9rem;
}

/* Info Box / Callouts */
.info-box {
  background: rgba(0, 242, 254, 0.05);
  border-left: 4px solid var(--accent-cyan);
  padding: 1.25rem 1.5rem;
  border-radius: 0 12px 12px 0;
  margin: 2rem 0;
}

.info-box strong {
  color: var(--accent-cyan);
  display: block;
  margin-bottom: 0.25rem;
}

/* Navigation & Interaction Bottom Controls */
.content-navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.btn-nav-prev,
.btn-nav-next {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-primary);
  font-size: 0.9rem;
}

.btn-nav-prev:hover,
.btn-nav-next:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-blue);
  transform: translateY(-1px);
}

.btn-nav-next.accented {
  background: var(--grad-primary);
  color: var(--text-inverse);
  border-color: transparent;
}

.btn-nav-next.accented:hover {
  box-shadow: var(--shadow-glow);
  filter: brightness(1.1);
}

.btn-complete {
  background: rgba(0, 245, 160, 0.1);
  border: 1px solid rgba(0, 245, 160, 0.2);
  color: var(--accent-green);
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-primary);
  font-size: 0.9rem;
}

.btn-complete:hover {
  background: var(--accent-green);
  color: var(--text-inverse);
  box-shadow: 0 0 20px rgba(0, 245, 160, 0.25);
  border-color: transparent;
}

.btn-complete.active {
  background: var(--accent-green);
  color: var(--text-inverse);
  border-color: transparent;
}

/* Mobile Toggle Hamburger */
.mobile-sidebar-toggle {
  display: none;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  width: 48px;
  height: 48px;
  border-radius: 12px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 110;
  box-shadow: 0 8px 30px rgba(0,0,0,0.5);
  backdrop-filter: var(--blur-glass);
}

/* Guide Section styling */
.guide-container {
  padding: 4rem 0;
  max-width: 800px;
  margin: 0 auto;
}

.guide-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: 24px;
  padding: 2.5rem;
  backdrop-filter: var(--blur-glass);
  box-shadow: var(--shadow-card);
}

.guide-step {
  margin-bottom: 2.5rem;
  position: relative;
  padding-left: 3rem;
}

.guide-step::before {
  content: attr(data-step);
  position: absolute;
  left: 0;
  top: 0;
  width: 36px;
  height: 36px;
  background: var(--grad-primary);
  border-radius: 50%;
  color: var(--text-inverse);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Footer Styling */
footer {
  border-top: 1px solid var(--border-glass);
  background: #04060b;
  padding: 3rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-family: var(--font-secondary);
}

/* ==========================================================================
   Responsive Queries
   ========================================================================== */
@media (max-width: 992px) {
  .viewer-container {
    flex-direction: column;
  }

  .sidebar {
    position: fixed;
    top: 80px;
    left: -320px;
    width: 300px;
    height: calc(100vh - 80px);
    z-index: 99;
  }

  .sidebar.open {
    left: 0;
  }

  .content-panel {
    padding: 2rem;
    width: 100%;
  }

  .mobile-sidebar-toggle {
    display: flex;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .course-grid {
    grid-template-columns: 1fr;
  }

  .content-navigation {
    flex-direction: column;
    gap: 1rem;
  }

  .content-navigation button {
    width: 100%;
    justify-content: center;
  }
}