/* ana kart - dark cam efekti */
  .system-container {
      max-width: 1300px;
      width: 100%;
      background: rgba(12, 20, 28, 0.75);
      backdrop-filter: blur(10px);
      border-radius: 2.5rem;
      box-shadow: 0 25px 45px -12px rgba(0, 0, 0, 0.6), 0 1px 2px rgba(255, 255, 255, 0.05);
      padding: 1.8rem 1.8rem 2rem 1.8rem;
      transition: all 0.2s;
      border: 1px solid rgba(72, 120, 150, 0.25);
  }

  /* başlık bölümü - dark uyumlu */
  .hero {
      text-align: center;
      margin-bottom: 2rem;
  }

  .hero h1 {
      font-size: 2.3rem;
      font-weight: 700;
      background: linear-gradient(125deg, #b9e2ff, #7bc3e6, #4f9fcf);
      background-clip: text;
      -webkit-background-clip: text;
      color: transparent;
      letter-spacing: -0.3px;
      text-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  }

  .hero .tagline {
      font-size: 1.2rem;
      font-weight: 600;
      background: #2c4f6e30;
      backdrop-filter: blur(4px);
      display: inline-block;
      padding: 0.25rem 1.2rem;
      border-radius: 40px;
      color: #a7d0f0;
      margin-top: 0.6rem;
      border: 1px solid rgba(100, 170, 210, 0.3);
  }

  .flow-badge {
      display: flex;
      justify-content: center;
      gap: 1rem;
      flex-wrap: wrap;
      margin: 1.5rem 0 0.8rem;
  }

  .pill {
      background: #152e3ce0;
      backdrop-filter: blur(4px);
      padding: 0.4rem 1.2rem;
      border-radius: 60px;
      color: #cee9ff;
      font-size: 0.85rem;
      font-weight: 500;
      letter-spacing: 0.3px;
      border: 1px solid #3b6f8b60;
  }

  /* DİYAGRAM ALANI - dark taban */
  .diagram-modern {
      margin: 2rem 0 1.5rem 0;
      background: #07121cd9;
      backdrop-filter: blur(2px);
      border-radius: 2rem;
      padding: 1.5rem 1rem;
      box-shadow: inset 0 0 0 1px rgba(72, 140, 180, 0.2), 0 20px 30px -12px black;
  }

  /* akış konteyneri: masaüstünde yan yana, mobilde alt alta */
  .flow-nodes {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      align-items: stretch;
      gap: 1.2rem;
      margin-bottom: 1.8rem;
  }

  /* her bir kutu - dark kartlar */
  .node-card {
      flex: 1;
      min-width: 200px;
      background: #0a1822ee;
      border-radius: 1.5rem;
      padding: 1.2rem 0.8rem;
      text-align: center;
      transition: all 0.25s ease;
      border: 1px solid rgba(70, 140, 180, 0.4);
      box-shadow: 0 8px 14px rgba(0, 0, 0, 0.4);
      backdrop-filter: blur(4px);
  }

  /* enerji kartı */
  .node-card.energy {
      background: linear-gradient(145deg, #0b202b, #06131e);
      border-left: 4px solid #f5b042;
  }

  .node-card.process {
      background: linear-gradient(145deg, #0d202c, #071420);
      border-left: 4px solid #4c9fcf;
  }

  .node-card.output {
      background: linear-gradient(145deg, #0e2330, #081421);
      border-left: 4px solid #f5cb5c;
  }

  .node-icon {
      font-size: 2.4rem;
      margin-bottom: 0.4rem;
      filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.4));
  }

  .node-title {
      font-weight: 800;
      font-size: 1.4rem;
      color: #eaf4fc;
      letter-spacing: -0.2px;
  }

  .node-sub {
      font-size: 0.75rem;
      color: #9bc2df;
      margin-top: 0.25rem;
      font-weight: 500;
  }

  .node-desc {
      font-size: 0.8rem;
      color: #b8d4f0;
      margin-top: 0.7rem;
      font-family: monospace;
      word-break: break-word;
  }

  .signal-badge {
      background: #1e4057;
      display: inline-block;
      border-radius: 30px;
      padding: 0.2rem 0.7rem;
      font-size: 0.7rem;
      font-weight: 600;
      margin-top: 0.8rem;
      color: #ddf2ff;
      border: 1px solid #4d8aaa50;
  }

  /* ok işaretleri - dark tema */
  .arrow-connector {
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      color: #87c7e8;
      font-weight: 300;
      min-width: 40px;
      text-shadow: 0 0 3px #005c8a;
  }

  /* mobil düzen */
  @media (max-width: 780px) {
      .flow-nodes {
          flex-direction: column;
          align-items: stretch;
      }

      .arrow-connector {
          transform: rotate(90deg);
          margin: -0.2rem 0;
          font-size: 2rem;
      }

      .system-container {
          padding: 1.2rem;
      }

      .hero h1 {
          font-size: 1.7rem;
      }
  }

  /* kontrol paneli - dark */
  .control-bar {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 1rem;
      margin-top: 0.5rem;
      margin-bottom: 0.8rem;
      background: #0a1722b3;
      backdrop-filter: blur(12px);
      padding: 0.8rem 1.2rem;
      border-radius: 3rem;
      border: 1px solid #2d5b7840;
  }

  .live-signal {
      background: #061018;
      padding: 0.4rem 1.2rem;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.85rem;
      color: #b4defa;
      border: 1px solid #2f6888;
  }

  .live-signal span {
      color: #ffda99;
      background: #1f2f3c;
      padding: 0.2rem 0.7rem;
      border-radius: 30px;
      margin-left: 0.4rem;
  }

  .btn-group {
      display: flex;
      gap: 0.7rem;
      flex-wrap: wrap;
  }

  .btn {
      border: none;
      background: #1c3a4b;
      padding: 0.5rem 1.2rem;
      border-radius: 2rem;
      font-weight: 600;
      font-family: 'Inter', sans-serif;
      font-size: 0.8rem;
      color: #eef5ff;
      cursor: pointer;
      transition: 0.2s;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
      border: 1px solid #3f7797;
  }

  .btn-primary {
      background: #2c6e9e;
      border-color: #6bb0da;
  }

  .btn-primary:hover {
      background: #1e5a83;
      transform: scale(0.97);
  }

  .btn-outline {
      background: #1b2e3f;
      border: 1px solid #4f8cad;
  }

  .btn-outline:hover {
      background: #254f6e;
  }

  /* bilgi kartları - dark uyum */
  .info-cards {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 1.2rem;
      margin: 2rem 0 0.7rem;
  }

  .info-item {
      background: #0b1822dd;
      backdrop-filter: blur(4px);
      border-radius: 1.5rem;
      padding: 1rem;
      border: 1px solid #2e607b80;
      transition: all 0.2s;
  }

  .info-item h4 {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
      color: #c2e2ff;
  }

  .info-item p {
      font-size: 0.85rem;
      color: #c4d7e8;
      line-height: 1.4;
  }

  .footer {
      text-align: center;
      font-size: 0.7rem;
      color: #87aec9;
      margin-top: 1.5rem;
      padding-top: 1rem;
      border-top: 1px solid #2c5775;
  }

  /* animasyonlu minik sinyal */
  .pulse-dot {
      display: inline-block;
      width: 10px;
      height: 10px;
      background-color: #ffb347;
      border-radius: 50%;
      margin-right: 6px;
      animation: pulse 1.2s infinite;
      box-shadow: 0 0 6px #f5b042;
  }

  @keyframes pulse {
      0% {
          opacity: 0.4;
          transform: scale(0.8);
      }

      100% {
          opacity: 1;
          transform: scale(1.2);
          background-color: #fde16d;
      }
  }

  /* ekstra geçiş yumuşaklığı için border glow */
  .node-card {
      transition: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1.1);
  }