/* =======================
   PUBLIC PAGES - SPKDP
   ======================= */

/* --- Navbar --- */
.public-navbar {
  background: transparent !important;
  transition: all 0.3s ease;
  padding: 15px 0;
}

.public-navbar.scrolled {
  background: rgba(102, 126, 234, 0.97) !important;
  backdrop-filter: blur(10px);
  padding: 8px 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.public-navbar .navbar-brand {
  color: #fff !important;
  font-size: 1.3rem;
}

.public-navbar .nav-link {
  color: rgba(255, 255, 255, 0.85) !important;
  font-weight: 500;
  padding: 8px 16px !important;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.public-navbar .nav-link:hover,
.public-navbar .nav-link.active {
  color: #fff !important;
  background: rgba(255, 255, 255, 0.15);
}

.public-navbar .navbar-toggler {
  border-color: rgba(255, 255, 255, 0.3);
}

.public-navbar .navbar-toggler-icon {
  filter: brightness(100);
}

/* --- Hero Section --- */
.hero-section {
  background: linear-gradient(135deg, #667eea 0%, #5a3e9e 50%, #764ba2 100%);
  position: relative;
  overflow: hidden;
  min-height: 100vh;
  padding-top: 80px;
}

.hero-particles {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(
      circle at 20% 50%,
      rgba(255, 255, 255, 0.05) 1px,
      transparent 1px
    ),
    radial-gradient(
      circle at 80% 20%,
      rgba(255, 255, 255, 0.04) 1px,
      transparent 1px
    ),
    radial-gradient(
      circle at 40% 80%,
      rgba(255, 255, 255, 0.03) 1px,
      transparent 1px
    );
  background-size:
    60px 60px,
    80px 80px,
    100px 100px;
  animation: particleFloat 20s linear infinite;
}

@keyframes particleFloat {
  0% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(-60px);
  }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 1.2rem;
}

.gradient-text {
  background: linear-gradient(135deg, #ffd700, #ffb347);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.15rem;
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 520px;
}

.hero-wave {
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  line-height: 0;
}

.hero-wave svg {
  width: 100%;
  height: 120px;
}

/* Hero Illustration */
.hero-illustration {
  position: relative;
  height: 450px;
}

.hero-circle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 2px solid rgba(255, 255, 255, 0.12);
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    transform: translate(-50%, -50%) scale(1);
  }
  50% {
    transform: translate(-50%, -50%) scale(1.05);
  }
}

.hero-icon-main {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 6rem;
  color: rgba(255, 255, 255, 0.9);
  text-shadow: 0 5px 30px rgba(0, 0, 0, 0.2);
}

.floating-card {
  position: absolute;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  padding: 14px 20px;
  color: #fff;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  font-weight: 500;
}

.floating-card i {
  font-size: 1.3rem;
}

.floating-card.card-1 {
  top: 15%;
  right: 5%;
  animation: float1 4s ease-in-out infinite;
}

.floating-card.card-2 {
  bottom: 30%;
  left: 5%;
  animation: float2 5s ease-in-out infinite;
}

.floating-card.card-3 {
  bottom: 15%;
  right: 12%;
  animation: float3 4.5s ease-in-out infinite;
}

@keyframes float1 {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-15px);
  }
}

@keyframes float2 {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px) translateX(5px);
  }
}

@keyframes float3 {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px) translateX(-5px);
  }
}

/* --- Page Hero (inner pages) --- */
.page-hero {
  background: linear-gradient(135deg, #667eea 0%, #5a3e9e 50%, #764ba2 100%);
  padding: 160px 0 120px;
  position: relative;
  overflow: hidden;
}

/* --- Stat Cards --- */
.stat-card {
  padding: 30px 20px;
}

.stat-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 15px;
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: #2d3748;
  margin-bottom: 5px;
}

.stat-label {
  color: #718096;
  font-size: 0.9rem;
  margin-bottom: 0;
  font-weight: 500;
}

/* --- Feature Cards --- */
.feature-card {
  background: #fff;
  border-radius: 16px;
  padding: 30px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  transition: all 0.3s ease;
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(102, 126, 234, 0.15);
}

.feature-icon-wrapper {
  display: inline-block;
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(102, 126, 234, 0.1);
  color: #667eea;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 15px 0 0;
}

.feature-list li {
  padding: 4px 0;
  font-size: 0.9rem;
  color: #4a5568;
}

.feature-list li i {
  margin-right: 8px;
}

/* --- Step Cards --- */
.step-card {
  position: relative;
  padding: 30px 20px;
}

.step-number {
  position: absolute;
  top: 10px;
  right: 20px;
  font-size: 3.5rem;
  font-weight: 900;
  color: rgba(102, 126, 234, 0.08);
  line-height: 1;
}

.step-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 5px;
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.3);
}

/* --- Tech Section --- */
.tech-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 15px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.tech-item i {
  font-size: 1.5rem;
}

.text-purple {
  color: #764ba2 !important;
}

.tech-showcase {
  perspective: 1000px;
}

.code-preview {
  background: #1e1e2e;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  transform: rotateY(-5deg) rotateX(2deg);
  transition: transform 0.3s ease;
}

.code-preview:hover {
  transform: rotateY(0) rotateX(0);
}

.code-header {
  background: #181825;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.code-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.code-dot.red {
  background: #f38ba8;
}
.code-dot.yellow {
  background: #f9e2af;
}
.code-dot.green {
  background: #a6e3a1;
}

.code-title {
  color: #6c7086;
  font-size: 0.8rem;
  margin-left: auto;
}

.code-body {
  padding: 20px;
  font-family: "Cascadia Code", "Fira Code", monospace;
  font-size: 0.85rem;
  line-height: 1.8;
  color: #cdd6f4;
}

.code-keyword {
  color: #cba6f7;
}
.code-func {
  color: #89b4fa;
}
.code-var {
  color: #f38ba8;
}

/* --- CTA Section --- */
.cta-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 80px 0;
  position: relative;
}

/* --- Footer --- */
.public-footer {
  background: #1a1a2e;
  color: #fff;
  padding: 60px 0 30px;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  transition: color 0.3s ease;
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: #fff;
}

/* --- About Page --- */
.about-image-card {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 20px;
  padding: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 320px;
}

.about-icon-large {
  font-size: 8rem;
  color: rgba(255, 255, 255, 0.9);
  text-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.about-badge {
  position: absolute;
  bottom: 20px;
  right: 20px;
}

.vision-card {
  background: #fff;
  border-radius: 16px;
  padding: 35px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.vision-icon {
  width: 60px;
  height: 60px;
  border-radius: 14px;
  background: rgba(102, 126, 234, 0.1);
  color: #667eea;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 15px;
}

.mission-list {
  padding-left: 0;
  list-style: none;
}

.mission-list li {
  padding: 6px 0 6px 24px;
  position: relative;
}

.mission-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #667eea;
  font-weight: bold;
}

.advantage-card {
  background: #fff;
  border-radius: 12px;
  padding: 25px 15px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.advantage-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(102, 126, 234, 0.12);
}

.advantage-card i {
  font-size: 2rem;
}

/* --- Algorithm Page --- */
.algo-overview-card {
  background: #fff;
  border-radius: 16px;
  padding: 30px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(0, 0, 0, 0.04);
  position: relative;
  overflow: hidden;
}

.algo-badge {
  display: inline-block;
  background: #667eea;
  color: #fff;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.algo-badge.bg-success {
  background: #28a745 !important;
}

.algo-tag {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 15px;
}

.algo-content-card {
  background: #fff;
  border-radius: 16px;
  padding: 30px;
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.algo-method-card {
  background: #fff;
  border-radius: 16px;
  padding: 25px;
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.formula-box {
  background: #f8f9fa;
  border-radius: 10px;
  padding: 15px 20px;
  border-left: 4px solid #667eea;
}

.formula-box.highlight {
  background: linear-gradient(
    135deg,
    rgba(102, 126, 234, 0.05),
    rgba(118, 75, 162, 0.05)
  );
  border-left-color: #764ba2;
}

.formula-box.bg-success-subtle {
  border-left-color: #28a745;
}

.formula-box.bg-danger-subtle {
  border-left-color: #dc3545;
}

.formula {
  font-family: "Cambria Math", "Times New Roman", serif;
  font-size: 1.1rem;
  color: #2d3748;
  letter-spacing: 0.5px;
}

.example-box {
  background: #f0f4ff;
  border-radius: 8px;
  padding: 12px 15px;
}

.matching-flow {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.flow-step {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  padding: 15px 0;
  border-left: 3px solid #e2e8f0;
  margin-left: 17px;
  padding-left: 25px;
  position: relative;
}

.flow-step:last-child {
  border-left-color: transparent;
}

.flow-number {
  position: absolute;
  left: -14px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.flow-content {
  flex: 1;
}

.algo-table th {
  background: #f8f9fa;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.topsis-step {
  padding: 20px 0;
  border-bottom: 1px solid #f0f0f0;
}

.topsis-step:last-child {
  border-bottom: none;
}

.topsis-step-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.topsis-step-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, #28a745, #20c997);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.integration-flow {
  position: relative;
}

.integration-card {
  background: #fff;
  border-radius: 16px;
  padding: 30px 25px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  border: 2px solid transparent;
  transition: all 0.3s ease;
  margin: 0 5px;
}

.integration-card.active {
  border-color: #667eea;
}

.integration-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.integration-connector {
  display: none;
}

.relation-card {
  background: #f8f9fa;
  border-radius: 10px;
  padding: 15px;
  border-left: 3px solid #667eea;
}

.reference-list {
  list-style: none;
  padding: 0;
  counter-reset: ref;
}

.reference-list li {
  padding: 10px 0 10px 30px;
  position: relative;
  color: #4a5568;
  font-size: 0.95rem;
  border-bottom: 1px solid #f0f0f0;
}

.reference-list li:last-child {
  border-bottom: none;
}

.reference-list li::before {
  counter-increment: ref;
  content: "[" counter(ref) "]";
  position: absolute;
  left: 0;
  color: #667eea;
  font-weight: 600;
  font-size: 0.85rem;
}

/* --- Responsive --- */
@media (max-width: 991.98px) {
  .hero-title {
    font-size: 2.2rem;
  }

  .hero-section {
    padding-top: 100px;
  }

  .hero-section .row {
    min-height: auto;
    padding: 80px 0 120px;
  }

  .page-hero {
    padding: 120px 0 80px;
  }

  .public-navbar {
    background: rgba(102, 126, 234, 0.97) !important;
  }
}

@media (max-width: 575.98px) {
  .hero-title {
    font-size: 1.8rem;
  }

  .stat-number {
    font-size: 1.6rem;
  }

  .feature-card,
  .algo-content-card,
  .algo-method-card {
    padding: 20px;
  }

  .about-image-card {
    padding: 40px;
    min-height: 200px;
  }

  .about-icon-large {
    font-size: 5rem;
  }

  .code-preview {
    transform: none;
  }
}