/* ============================================================================= */
/*                      VARIABLE & GLOBAL STYLES                                 */
/* ============================================================================= */

:root {
  --bg-color: #1a1b26;
  --card-color: #24283b;
  --text-color: #c0caf5;
  --header-color: #ffffff;
  --accent-color-1: #bb9af7; /* Purple */
  --accent-color-2: #7aa2f7; /* Blue */
  --accent-color-green: #9ece6a;
  --accent-color-yellow: #e0af68;
  --accent-color-red: #f7768e;
  --border-color: #414868;
  --code-bg-color: #1e202e;
  --shadow-color: rgba(0, 0, 0, 0.2);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-color);
  background-image: radial-gradient(
    circle at 50% 0%,
    rgba(122, 162, 247, 0.1),
    transparent 40%
  );
  color: var(--text-color);
  font-family: "Poppins", sans-serif;
  line-height: 1.8;
  padding: 2rem 1rem;
}

.container {
  max-width: 900px;
  margin: 2rem auto;
}

/* ============================================================================= */
/*                      HEADER & PROGRESS BAR                                    */
/* ============================================================================= */

header {
  text-align: center;
  margin-bottom: 3rem;
}

header h1 {
  font-family: "Roboto Mono", monospace;
  color: var(--header-color);
  font-size: clamp(2.2rem, 5vw, 3rem);
  margin-bottom: 0.5rem;
  text-shadow: 0 0 10px rgba(122, 162, 247, 0.6);
  letter-spacing: -1.5px;
}

header p {
  color: var(--accent-color-1);
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto;
}

.progress-container {
  width: 100%;
  background-color: var(--card-color);
  border-radius: 25px;
  margin-top: 2rem;
  border: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: 0 4px 15px var(--shadow-color);
}

.progress-bar {
  width: 0%;
  height: 28px;
  background: linear-gradient(
    90deg,
    var(--accent-color-1),
    var(--accent-color-2)
  );
  border-radius: 25px;
  text-align: center;
  line-height: 28px;
  color: var(--bg-color);
  font-weight: 700;
  transition: width 0.8s cubic-bezier(0.25, 1, 0.5, 1);
  font-family: "Roboto Mono", monospace;
  text-shadow: 0 0 2px rgba(255, 255, 255, 0.3);
}

.intro-text {
  text-align: center;
  margin: 3rem 0;
  padding: 1rem;
  background-color: rgba(36, 40, 59, 0.5);
  border-left: 4px solid var(--accent-color-1);
  border-radius: 4px;
  color: var(--text-color);
  font-style: italic;
}

/* ============================================================================= */
/*                      MODULE ACCORDION STYLES                                  */
/* ============================================================================= */

/* --- Module Card Container --- */
.module-card {
  background-color: var(--card-color);
  border-radius: 12px;
  margin-bottom: 1.25rem;
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px var(--shadow-color);
}
.module-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px var(--shadow-color);
}
.module-card.completed {
  border-left: 5px solid var(--accent-color-green);
}

/* --- Module Header (Clickable Area) --- */
.module-header {
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 1rem;
  background-color: rgba(0, 0, 0, 0.1);
  transition: background-color 0.3s ease;
  justify-content: space-between;
}
.module-header:hover {
  background-color: rgba(187, 154, 247, 0.1);
}

.module-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 0;
}
.module-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.module-number {
  font-family: "Roboto Mono", monospace;
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--accent-color-1);
  min-width: 30px;
  text-align: right;
}
.module-icon {
  font-size: 1.6rem;
  color: var(--accent-color-2);
  width: 30px;
  text-align: center;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.module-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--header-color);
}
.tag {
  padding: 0.3rem 0.8rem;
  border-radius: 15px;
  font-size: 0.8rem;
  font-weight: bold;
  color: var(--bg-color);
  flex-shrink: 0;
}
.tag-dasar {
  background-color: var(--accent-color-green);
}
.tag-menengah {
  background-color: var(--accent-color-yellow);
}
.tag-lanjutan {
  background-color: var(--accent-color-red);
}

.complete-btn {
  background: none;
  border: 2px solid var(--border-color);
  color: var(--border-color);
  width: 35px;
  height: 35px;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1.2rem;
  flex-shrink: 0;
  display: grid;
  place-items: center;
}
.complete-btn:hover {
  border-color: var(--accent-color-green);
  color: var(--accent-color-green);
  transform: scale(1.1) rotate(10deg);
}
.completed .complete-btn {
  background-color: var(--accent-color-green);
  border-color: var(--accent-color-green);
  color: var(--card-color);
  font-weight: bold;
  transform: scale(1.05);
}
.completed .complete-btn .fa-check {
  font-weight: 900;
}

/* --- Module Body (Collapsible Content) --- */
.module-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.7s cubic-bezier(0.4, 0, 0.2, 1),
    padding 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 0 1.5rem;
}
.module-body-content {
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border-color);
}
.module-card.active .module-body {
  max-height: 5000px; /* Nilai besar untuk memastikan konten muat */
}
.module-card.active .module-icon {
  transform: rotate(90deg);
}

/* --- Content Inside Module Body --- */
.module-body h5 {
  color: var(--accent-color-1);
  font-size: 1.1rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  font-family: "Roboto Mono", monospace;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.module-body h5:first-child {
  margin-top: 0;
}
.module-body h5 i {
  color: var(--accent-color-2);
  font-size: 1rem;
}

.module-body p {
  margin-bottom: 1.5rem;
  padding-left: 1rem;
  border-left: 3px solid var(--accent-color-2);
}

.module-body ol {
  list-style: none;
  counter-reset: step-counter;
  padding-left: 0;
}
.module-body ol li {
  counter-increment: step-counter;
  position: relative;
  margin-bottom: 1.5rem;
  background-color: rgba(0, 0, 0, 0.1);
  padding: 1.5rem 1.5rem 1.5rem 5rem;
  border-radius: 8px;
  border-left: 3px solid transparent;
  transition: border-left-color 0.3s ease;
}
.module-body ol li:hover {
  border-left-color: var(--accent-color-1);
}
.module-body ol li::before {
  content: counter(step-counter);
  font-family: "Roboto Mono", monospace;
  font-weight: 700;
  position: absolute;
  left: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  width: 2.5rem;
  height: 2.5rem;
  background-color: var(--accent-color-2);
  color: var(--card-color);
  border-radius: 50%;
  text-align: center;
  line-height: 2.5rem;
  font-size: 1.2rem;
  box-shadow: 0 4px 8px var(--shadow-color);
}
.step-title {
  font-weight: 700;
  color: var(--header-color);
  display: block;
  margin-bottom: 0.5rem;
}
.step-description {
  font-style: italic;
  color: var(--text-color);
  font-size: 0.95em;
}

code {
  background-color: var(--code-bg-color);
  color: var(--accent-color-yellow);
  padding: 0.2em 0.5em;
  margin: 0 0.2em;
  border-radius: 5px;
  font-family: "Roboto Mono", monospace;
  font-size: 0.9em;
  border: 1px solid var(--border-color);
}

.ref-links ul {
  list-style: none;
  padding-left: 0;
}
.ref-links li {
  margin-bottom: 0.5rem;
}
.ref-links a {
  color: var(--accent-color-2);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}
.ref-links a:hover {
  color: var(--accent-color-1);
  text-decoration: underline;
  padding-left: 5px;
}

/* ============================================================================= */
/*                      UTILITIES & RESPONSIVE                                   */
/* ============================================================================= */

.closing-statement {
  text-align: center;
  background-color: var(--card-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  border-top: 5px solid var(--accent-color-green);
  padding: 2.5rem;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  margin-top: 0;
  transition: opacity 0.5s ease, max-height 0.5s ease, margin-top 0.5s ease,
    padding 0.5s ease;
}
.closing-statement.visible {
  opacity: 1;
  max-height: 500px;
  margin-top: 4rem;
  padding: 2.5rem;
}
.closing-statement h3 {
  color: var(--accent-color-green);
  margin-bottom: 1rem;
  font-size: 1.8rem;
}
.closing-statement p {
  border-left: none;
  padding-left: 0;
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background-color: var(--accent-color-1);
  color: var(--bg-color);
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  display: none; /* Hidden by default */
  place-items: center;
  box-shadow: 0 5px 15px var(--shadow-color);
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.back-to-top.visible {
  display: grid;
  opacity: 1;
}
.back-to-top:hover {
  transform: scale(1.1);
  background-color: var(--accent-color-2);
}

/* --- Mobile Layout Fix --- */
@media (max-width: 600px) {
  .module-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  .module-meta {
    width: 100%;
    justify-content: space-between;
    margin-top: 0.5rem;
  }
  .module-title {
    font-size: 1.1rem;
  }
}