/* ==========================================================================
   EduUpload - Website Pendidikan & Pengumpulan Berkas Digital
   Design System & Main Stylesheet (Vanilla CSS)
   Colors: Primary Blues, Deep Blacks & Pure Whites
   ========================================================================== */

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

/* --- CSS Variables & Design Tokens --- */
:root {
  /* Brand Colors */
  --bg-main: #0B1F12;          /* Deepest Midnight Black */
  --bg-surface: #123524;       /* Slate Black Card Surface */
  --bg-card-hover: #1B4D35;    /* Interactive Dark Slate */
  --bg-input: #163A28;         /* Form Field Dark Background */
  
  --primary-blue: #15803D;     /* Royal Electric Blue */
  --primary-light: #22C55E;    /* Vibrant Bright Blue */
  --primary-glow: rgba(34,197,94,.45);
  --cyan-accent: #4ADE80;      /* Bright Cyan Highlight */
  --blue-dark: #166534;        /* Deep Blue Border/Hover */

  --text-white: #FFFFFF;       /* Pure Crisp White */
  --text-muted: #D1FAE5;       /* Silver Gray Subtitle Text */
  --text-dim: #A7CDB5;         /* Dim Gray Details */

  --border-dark: #1B4D35;      /* Card / Input Border */
  --border-light: rgba(255, 255, 255, 0.12);
  --border-blue: rgba(34,197,94,.45);

  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 35px rgba(22,101,52,.35);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-main);
  color: var(--text-white);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* --- Typography & Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(22,197,94,.15);
  border: 1px solid var(--border-blue);
  color: var(--cyan-accent);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 20px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--cyan-accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--cyan-accent);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.gradient-text {
  background: linear-gradient(135deg, #FFFFFF 20%, var(--primary-light) 60%, var(--cyan-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-tag {
  color: var(--primary-light);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  display: block;
  margin-bottom: 10px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 650px;
  margin: 0 auto;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Header / Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(7, 10, 16, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-dark);
  padding: 18px 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-white);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-light));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 0 15px var(--primary-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 26px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-light));
  color: var(--text-white);
  box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--primary-glow);
  background: linear-gradient(135deg, var(--primary-light), var(--cyan-accent));
}

.btn-outline {
  background: rgba(15, 23, 42, 0.6);
  border-color: var(--border-dark);
  color: var(--text-white);
}

.btn-outline:hover {
  border-color: var(--primary-light);
  background: var(--bg-surface);
  color: var(--primary-light);
}

.btn-block {
  width: 100%;
}

/* --- Hero Section --- */
.hero-section {
  padding-top: 150px;
  padding-bottom: 90px;
  position: relative;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(22,101,52,.35) 0%, rgba(7, 10, 16, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 640px;
}

.hero-title {
  font-size: 4.2rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-description {
  font-size: 1.9rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding-top: 32px;
  border-top: 1px solid var(--border-dark);
}

.stat-item h4 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-white);
}

.stat-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.hero-image-wrapper {
  position: relative;
}

.hero-card-preview {
  background: var(--bg-surface);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-lg);
  padding: 12px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.hero-card-preview img {
  border-radius: var(--radius-md);
  width: 100%;
  object-fit: cover;
}

.floating-badge {
  position: absolute;
  bottom: 24px;
  left: -20px;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-blue);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: var(--shadow-glow);
  animation: floatAnim 4s ease-in-out infinite alternate;
}

@keyframes floatAnim {
  0% { transform: translateY(0); }
  100% { transform: translateY(-10px); }
}

.floating-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(59, 130, 246, 0.2);
  color: var(--cyan-accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.floating-text h5 {
  font-size: 1.95rem;
  font-weight: 700;
}

.floating-text p {
  font-size: 1.8rem;
  color: var(--text-muted);
}

/* --- Section Header Utility --- */
.section-header {
  text-align: center;
  margin-bottom: 60px;
}

/* --- Upload Section (Core Feature) --- */
.upload-section {
  padding: 90px 0;
  position: relative;
  background: linear-gradient(180deg, var(--bg-main) 0%, rgba(15, 23, 42, 0.4) 50%, var(--bg-main) 100%);
}

.upload-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: stretch;
}

.upload-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-card);
  position: relative;
  display: flex;
  flex-direction: column;
}

.upload-card-header {
  margin-bottom: 24px;
}

.upload-card-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.upload-card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* Custom Drag & Drop File Zone */
.dropzone-wrapper {
  position: relative;
  margin-bottom: 24px;
}

.file-input-hidden {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  opacity: 0;
  cursor: pointer;
  z-index: 10;
}

.dropzone-box {
  border: 2px dashed var(--border-blue);
  background: rgba(17, 24, 39, 0.6);
  border-radius: var(--radius-md);
  padding: 40px 24px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}

.file-input-hidden:hover + .dropzone-box,
.file-input-hidden:focus + .dropzone-box {
  border-color: var(--cyan-accent);
  background: rgba(22,197,94,.10);
  box-shadow: var(--shadow-glow);
}

.dropzone-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px auto;
  background: rgba(22,197,94,.15);
  color: var(--primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.file-input-hidden:hover + .dropzone-box .dropzone-icon {
  transform: scale(1.1);
  background: var(--primary-blue);
  color: #fff;
}

.dropzone-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.dropzone-hint {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.file-tags {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.file-tag {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-light);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

/* Student Form Metadata */
.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-white);
}

.form-control {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text-white);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.form-control::placeholder {
  color: var(--text-dim);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* Upload Status / Preview Visual Side */
.upload-status-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.status-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-dark);
}

.status-title {
  font-size: 1.5rem;
  font-weight: 700;
}

.status-badge-active {
  background: rgba(34, 197, 94, 0.15);
  color: #4ADE80;
  border: 1px solid rgba(34, 197, 94, 0.3);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
}

.file-preview-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 28px;
}
}

.file-preview-item:hover {
  border-color: var(--primary-light);
  transform: translateX(4px);
}

.file-type-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(22,197,94,.20);
  color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.file-details {
  flex-grow: 1;
}

.file-name {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.file-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  gap: 12px;
}

.progress-bar-container {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  margin-top: 8px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-blue), var(--cyan-accent));
  border-radius: 4px;
  width: 85%;
  animation: progressPulse 2s ease-in-out infinite alternate;
}

@keyframes progressPulse {
  0% { opacity: 0.8; }
  100% { opacity: 1; }
}

.receipt-box {
  background: rgba(37, 99, 235, 0.08);
  border: 1px dashed var(--border-blue);
  border-radius: var(--radius-md);
  padding: 20px;
}

.receipt-box h5 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--cyan-accent);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.receipt-box p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* --- Features Section --- */
.features-section {
  padding: 90px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  border-color:white;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-blue), var(--cyan-accent));
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(34,197,94,.45);
  box-shadow: var(--shadow-card);
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(22,197,94,.15);
  color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* --- How It Works Section --- */
.steps-section {
  padding: 90px 0;
  background: rgba(15, 23, 42, 0.3);
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}

.step-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  position: relative;
  transition: var(--transition);
}

.step-card:hover {
  border-color: var(--primary-light);
}

.step-number {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-light));
  color: #fff;
  font-weight: 800;
  font-size: 1.2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px auto;
  box-shadow: 0 0 15px var(--primary-glow);
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.step-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* --- Pure CSS Accordion FAQ Section --- */
.faq-section {
  padding: 90px 0;
}

.faq-wrapper {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-input {
  display: none;
}

.faq-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  user-select: none;
}

.faq-icon {
  width: 24px;
  height: 24px;
  transition: var(--transition);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, padding 0.35s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-input:checked ~ .faq-content {
  max-height: 200px;
  padding-bottom: 20px;
}

.faq-input:checked ~ .faq-label .faq-icon {
  transform: rotate(180deg);
  color: var(--cyan-accent);
}

.faq-input:checked ~ .faq-label {
  color: var(--primary-light);
}

/* --- Banner CTA --- */
.cta-banner {
  padding: 80px 0;
}

.cta-box {
  background: linear-gradient(135deg, rgba(22,197,94,.20), rgba(15, 23, 42, 0.9));
  border: 1px solid var(--border-blue);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-glow);
}

.cta-box h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-box p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 32px auto;
}

/* --- Footer --- */
.footer {
  background: #0B1F12;
  border-top: 1px solid var(--border-dark);
  padding: 70px 0 30px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand p {
  margin-top: 16px;
  max-width: 320px;
  line-height: 1.6;
}

.footer-col h5 {
  color: var(--text-white);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary-light);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid var(--border-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* --- Responsive Breakpoints --- */
@media (max-width: 992px) {
  .hero-grid,
  .upload-grid {
    grid-template-columns: 1fr;
  }

  .features-grid,
  .steps-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .hero-title {
    font-size: 2.5rem;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none; /* Hide menu links on mobile */
  }

  .hero-title {
    font-size: 2.1rem;
  }

  .features-grid,
  .steps-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    grid-template-columns: 1fr;
    text-align: center;
  }
}