/* ═══════════════════════════════════════════════════════════
   sengine // topics — Cyber-void theme
   Palette: Neon Green #39FF14 · Deep Black #000000
            Caution Yellow #FFFF00 · Amber #FFB000
   ═══════════════════════════════════════════════════════════ */

:root {
  --neon: #39FF14;
  --neon-dim: #2bcc10;
  --black: #0a0a0a;
  --black-light: #111111;
  --black-card: #0d0d0d;
  --yellow: #FFFF00;
  --amber: #FFB000;
  --gray-dark: #1a1a1a;
  --gray-mid: #2a2a2a;
  --gray-text: #888888;
  --gray-light: #aaaaaa;
  --font-mono: 'Courier New', 'Consolas', monospace;
  --font-sans: 'Arial Black', 'Impact', 'Helvetica Neue', sans-serif;
  --card-gap: 16px;
}

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

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

body {
  background: var(--black);
  color: var(--neon);
  font-family: var(--font-mono);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  line-height: 1.5;
}

/* Scanline overlay */
#scanline-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.03) 2px,
    rgba(0, 0, 0, 0.03) 4px
  );
}

/* ═══════════════ HEADER ═══════════════ */
#main-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--black);
  border-bottom: 1px solid var(--gray-mid);
  padding: 12px 20px;
  backdrop-filter: blur(8px);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.logo-prefix {
  color: var(--yellow);
  font-size: 1.1rem;
  font-weight: bold;
}

.logo-text {
  font-family: var(--font-sans);
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--neon);
  text-shadow: 0 0 10px rgba(57, 255, 20, 0.3);
}

.logo-version {
  color: var(--gray-text);
  font-size: 0.8rem;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--gray-text);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gray-mid);
  transition: background 0.3s;
}

.status-dot.online {
  background: var(--neon);
  box-shadow: 0 0 8px var(--neon);
}

.status-dot.offline {
  background: #ff4444;
  box-shadow: 0 0 8px #ff4444;
}

/* ═══════════════ MAIN CONTENT ═══════════════ */
#main-content {
  flex: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 20px;
  width: 100%;
}

/* ═══════════════ TOPICS GRID ═══════════════ */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--card-gap);
}

/* ═══════════════ TOPIC CARD ═══════════════ */
.topic-card {
  background: var(--black-card);
  border: 1px solid var(--gray-mid);
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  display: flex;
  flex-direction: column;
}

.topic-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--neon);
  transform: scaleX(0);
  transition: transform 0.2s ease;
}

.topic-card:hover {
  border-color: var(--neon);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(57, 255, 20, 0.1);
}

.topic-card:hover::before {
  transform: scaleX(1);
}

.topic-card:active {
  transform: translateY(0);
}

.card-thumbnail {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-bottom: 1px solid var(--gray-mid);
  filter: grayscale(30%) contrast(1.1);
  transition: filter 0.2s;
}

.topic-card:hover .card-thumbnail {
  filter: grayscale(0%) contrast(1.1);
}

.card-no-thumb {
  width: 100%;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gray-dark);
  font-size: 3rem;
  color: var(--gray-mid);
  border-bottom: 1px solid var(--gray-mid);
}

.card-body {
  padding: 14px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-source {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
  padding: 2px 6px;
  border-radius: 2px;
  display: inline-block;
  width: fit-content;
}

.card-source.trending {
  color: var(--amber);
  border: 1px solid var(--amber);
}

.card-source.random {
  color: var(--gray-text);
  border: 1px solid var(--gray-mid);
}

.card-title {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 900;
  line-height: 1.3;
  color: #e0e0e0;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-summary {
  font-size: 0.8rem;
  color: var(--gray-light);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  border-top: 1px solid var(--gray-mid);
  font-size: 0.7rem;
  color: var(--gray-text);
}

.card-related-count {
  display: flex;
  align-items: center;
  gap: 4px;
}

.card-related-count::before {
  content: '◇';
  color: var(--neon-dim);
}

/* ═══════════════ LOADING ═══════════════ */
.loading-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  gap: 16px;
}

.loading-indicator.hidden {
  display: none;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 2px solid var(--gray-mid);
  border-top-color: var(--neon);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  color: var(--gray-text);
  font-size: 0.8rem;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ═══════════════ LOAD MORE ═══════════════ */
.load-more-container {
  display: flex;
  justify-content: center;
  padding: 32px 0;
}

.load-more-container.hidden {
  display: none;
}

.btn-void {
  background: transparent;
  border: 1px solid var(--neon);
  color: var(--neon);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 900;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 14px 32px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-void:hover {
  background: var(--neon);
  color: var(--black);
  box-shadow: 0 0 20px rgba(57, 255, 20, 0.3);
}

.btn-void:active {
  transform: scale(0.97);
}

.btn-void:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-void:disabled:hover {
  background: transparent;
  color: var(--neon);
  box-shadow: none;
}

/* ═══════════════ EMPTY STATE ═══════════════ */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  text-align: center;
}

.empty-state.hidden {
  display: none;
}

.empty-icon {
  font-size: 4rem;
  color: var(--gray-mid);
  margin-bottom: 16px;
}

.empty-state p {
  color: var(--gray-text);
  font-size: 0.9rem;
}

/* ═══════════════ MODAL ═══════════════ */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--black-light);
  border: 1px solid var(--gray-mid);
  border-radius: 4px;
  max-width: 720px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  z-index: 1;
  animation: modalIn 0.2s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  background: var(--gray-dark);
  border: 1px solid var(--gray-mid);
  color: var(--gray-text);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 2px;
  transition: all 0.15s;
  z-index: 2;
}

.modal-close:hover {
  color: var(--neon);
  border-color: var(--neon);
}

.modal-header {
  display: flex;
  gap: 16px;
  padding: 20px;
  border-bottom: 1px solid var(--gray-mid);
}

.modal-thumbnail {
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: 2px;
  border: 1px solid var(--gray-mid);
  flex-shrink: 0;
}

.modal-thumbnail.hidden {
  display: none;
}

.modal-title-area {
  flex: 1;
  min-width: 0;
}

.modal-source-badge {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 2px 8px;
  border-radius: 2px;
  display: inline-block;
  margin-bottom: 8px;
}

.modal-source-badge.trending {
  color: var(--amber);
  border: 1px solid var(--amber);
}

.modal-source-badge.random {
  color: var(--gray-text);
  border: 1px solid var(--gray-mid);
}

.modal-title {
  font-family: var(--font-sans);
  font-size: 1.3rem;
  font-weight: 900;
  line-height: 1.3;
  color: #e0e0e0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.modal-category {
  font-size: 0.8rem;
  color: var(--gray-text);
}

.modal-body {
  padding: 20px;
}

.modal-summary {
  font-size: 0.9rem;
  color: var(--gray-light);
  line-height: 1.7;
  margin-bottom: 24px;
}

.modal-section {
  border-top: 1px solid var(--gray-mid);
  padding-top: 20px;
}

.modal-section-title {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--neon);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-icon {
  color: var(--neon-dim);
}

.related-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.related-tag {
  font-size: 0.75rem;
  padding: 6px 12px;
  background: var(--gray-dark);
  border: 1px solid var(--gray-mid);
  border-radius: 2px;
  color: var(--gray-light);
  cursor: pointer;
  transition: all 0.15s;
}

.related-tag:hover {
  border-color: var(--neon);
  color: var(--neon);
  background: rgba(57, 255, 20, 0.05);
}

/* ═══════════════ TOAST ═══════════════ */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: var(--gray-dark);
  border: 1px solid var(--gray-mid);
  border-left: 3px solid var(--neon);
  padding: 10px 16px;
  border-radius: 2px;
  font-size: 0.75rem;
  color: var(--gray-light);
  animation: toastIn 0.2s ease, toastOut 0.3s ease 2.7s forwards;
  max-width: 300px;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
  to { opacity: 0; transform: translateX(20px); }
}

/* ═══════════════ FOOTER ═══════════════ */
#main-footer {
  border-top: 1px solid var(--gray-mid);
  padding: 12px 20px;
  margin-top: auto;
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.7rem;
  color: var(--gray-text);
}

/* ═══════════════ SCROLLBAR ═══════════════ */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--black);
}

::-webkit-scrollbar-thumb {
  background: var(--gray-mid);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-text);
}

/* ═══════════════ RESPONSIVE ═══════════════ */
@media (max-width: 768px) {
  .topics-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 12px;
  }

  .modal-header {
    flex-direction: column;
  }

  .modal-thumbnail {
    width: 100%;
    height: 180px;
  }

  .modal-title {
    font-size: 1.1rem;
  }

  .header-inner {
    flex-direction: column;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  .topics-grid {
    grid-template-columns: 1fr;
  }

  .logo-text {
    font-size: 1.1rem;
  }

  .btn-void {
    padding: 12px 24px;
    font-size: 0.75rem;
  }
}

/* ═══════════════ UTILITY ═══════════════ */
.hidden {
  display: none !important;
}