@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&family=Syne:wght@400;600;700;800&display=swap');

  :root {
    --bg: #050a0f;
    --surface: #0a1520;
    --surface2: #0f1e2e;
    --border: #1a3a5c;
    --accent: #00d4ff;
    --accent2: #00ff9d;
    --accent3: #ff6b35;
    --warn: #ffb700;
    --text: #c8dde8;
    --text-dim: #4a7a9b;
    --mono: 'Share Tech Mono', monospace;
    --sans: 'Syne', sans-serif;
  }

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

  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    min-height: 100vh;
    overflow-x: hidden;
  }

  /* Animated grid background */
  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
      linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
      linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
  }

  body::after {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at 20% 20%, rgba(0,212,255,0.04) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 80%, rgba(0,255,157,0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
    animation: auraMove 12s ease-in-out infinite alternate;
  }

  @keyframes auraMove {
    0% { transform: translate(0,0); }
    100% { transform: translate(3%,3%); }
  }

  .container { position: relative; z-index: 1; max-width: 1100px; margin: 0 auto; padding: 0 24px; }

  /* Header */
  header {
    border-bottom: 1px solid var(--border);
    padding: 20px 0;
    position: sticky;
    top: 0;
    background: rgba(5,10,15,0.9);
    backdrop-filter: blur(12px);
    z-index: 100;
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--sans);
    font-weight: 800;
    font-size: 1.4rem;
    letter-spacing: -0.5px;
  }

  .logo-icon {
    width: 36px;
    height: 36px;
    border: 2px solid var(--accent);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--accent);
    box-shadow: 0 0 12px rgba(0,212,255,0.3);
    animation: pulse-border 3s ease-in-out infinite;
  }

  @keyframes pulse-border {
    0%,100% { box-shadow: 0 0 12px rgba(0,212,255,0.3); }
    50% { box-shadow: 0 0 24px rgba(0,212,255,0.6); }
  }

  .logo span { color: var(--accent); }

  .badge {
    font-family: var(--mono);
    font-size: 0.65rem;
    padding: 3px 10px;
    border: 1px solid var(--accent2);
    color: var(--accent2);
    border-radius: 20px;
    letter-spacing: 1px;
  }

  /* Tabs */
  .tabs {
    display: flex;
    gap: 4px;
    margin: 32px 0 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 6px;
  }

  .tab {
    flex: 1;
    padding: 12px;
    border: none;
    background: transparent;
    color: var(--text-dim);
    font-family: var(--sans);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s;
    letter-spacing: 0.3px;
  }

  .tab.active {
    background: var(--accent);
    color: var(--bg);
  }

  .tab:hover:not(.active) {
    background: var(--surface2);
    color: var(--text);
  }

  /* Cards */
  .card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 28px;
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
  }

  .card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0.5;
  }

  .card-title {
    font-size: 0.7rem;
    font-family: var(--mono);
    letter-spacing: 2px;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .card-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
  }

  /* Upload Zone */
  .upload-zone {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    background: rgba(0,212,255,0.01);
  }

  .upload-zone:hover, .upload-zone.dragover {
    border-color: var(--accent);
    background: rgba(0,212,255,0.04);
    transform: scale(1.01);
  }

  .upload-icon { font-size: 2.5rem; margin-bottom: 12px; display: block; }

  .upload-text {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
  }

  .upload-sub {
    font-size: 0.8rem;
    color: var(--text-dim);
    font-family: var(--mono);
  }

  input[type="file"] { display: none; }

  /* Forms */
  .form-group { margin-bottom: 16px; }

  label {
    display: block;
    font-size: 0.75rem;
    font-family: var(--mono);
    color: var(--text-dim);
    letter-spacing: 1px;
    margin-bottom: 8px;
    text-transform: uppercase;
  }

  input[type="text"], input[type="email"], textarea, select {
    width: 100%;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    color: var(--text);
    font-family: var(--mono);
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.2s;
  }

  input[type="text"]:focus, textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(0,212,255,0.1);
  }

  textarea { resize: vertical; min-height: 80px; }

  /* Buttons */
  .btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-family: var(--sans);
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: 0.5px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
  }

  .btn-primary {
    background: var(--accent);
    color: var(--bg);
  }

  .btn-primary:hover {
    background: #00b8d9;
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(0,212,255,0.3);
  }

  .btn-success {
    background: var(--accent2);
    color: var(--bg);
  }

  .btn-success:hover {
    background: #00d97e;
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(0,255,157,0.3);
  }

  .btn-danger {
    background: transparent;
    color: var(--accent3);
    border: 1px solid var(--accent3);
  }

  .btn-danger:hover {
    background: rgba(255,107,53,0.1);
  }

  .btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
  }

  .btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }

  /* Process steps */
  .process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin: 20px 0;
  }

  .step {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    position: relative;
    transition: all 0.4s;
  }

  .step.active {
    border-color: var(--accent);
    background: rgba(0,212,255,0.05);
    box-shadow: 0 0 16px rgba(0,212,255,0.1);
  }

  .step.done {
    border-color: var(--accent2);
    background: rgba(0,255,157,0.04);
  }

  .step-num {
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--text-dim);
    margin-bottom: 6px;
  }

  .step.active .step-num { color: var(--accent); }
  .step.done .step-num { color: var(--accent2); }

  .step-name {
    font-weight: 700;
    font-size: 0.85rem;
    margin-bottom: 4px;
  }

  .step-algo {
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--text-dim);
  }

  .step-spinner {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: none;
  }

  .step.active .step-spinner { display: block; }

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

  /* Hash display */
  .hash-display {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 16px;
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--accent2);
    word-break: break-all;
    line-height: 1.6;
  }

  .hash-label {
    font-size: 0.65rem;
    color: var(--text-dim);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 6px;
  }

  /* Key display */
  .key-box {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--warn);
    word-break: break-all;
    line-height: 1.5;
    max-height: 80px;
    overflow-y: auto;
  }

  /* File list */
  .file-item {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
    gap: 14px;
    transition: border-color 0.2s;
  }

  .file-item:hover { border-color: var(--accent); }

  .file-icon {
    font-size: 1.6rem;
    flex-shrink: 0;
    margin-top: 2px;
  }

  .file-info { flex: 1; min-width: 0; }

  .file-name {
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .file-meta {
    font-family: var(--mono);
    font-size: 0.68rem;
    color: var(--text-dim);
    margin-bottom: 8px;
  }

  .file-hash {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--accent2);
    word-break: break-all;
  }

  .file-actions { display: flex; gap: 8px; flex-shrink: 0; }

  /* Status badges */
  .status-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.68rem;
    font-family: var(--mono);
    letter-spacing: 0.5px;
  }

  .status-badge.secure {
    background: rgba(0,255,157,0.1);
    border: 1px solid rgba(0,255,157,0.3);
    color: var(--accent2);
  }

  .status-badge.warning {
    background: rgba(255,183,0,0.1);
    border: 1px solid rgba(255,183,0,0.3);
    color: var(--warn);
  }

  .status-badge.error {
    background: rgba(255,107,53,0.1);
    border: 1px solid rgba(255,107,53,0.3);
    color: var(--accent3);
  }

  /* Info grid */
  .info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
    margin-top: 16px;
  }

  .info-item {
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px;
  }

  .info-item-label {
    font-size: 0.65rem;
    font-family: var(--mono);
    color: var(--text-dim);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 6px;
  }

  .info-item-value {
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--accent);
    word-break: break-all;
  }

  /* Log terminal */
  .log-terminal {
    background: #020810;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    font-family: var(--mono);
    font-size: 0.72rem;
    max-height: 200px;
    overflow-y: auto;
    line-height: 1.8;
  }

  .log-entry { display: flex; gap: 10px; }
  .log-time { color: var(--text-dim); flex-shrink: 0; }
  .log-msg.info { color: var(--accent); }
  .log-msg.success { color: var(--accent2); }
  .log-msg.warn { color: var(--warn); }
  .log-msg.error { color: var(--accent3); }

  /* Notification */
  .notification {
    position: fixed;
    top: 80px;
    right: 24px;
    background: var(--surface);
    border: 1px solid var(--accent2);
    border-radius: 10px;
    padding: 14px 20px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent2);
    z-index: 999;
    transform: translateX(120%);
    transition: transform 0.3s cubic-bezier(.175,.885,.32,1.275);
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: 320px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  }

  .notification.show { transform: translateX(0); }

  /* Crypto concept pills */
  .concept-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
  }

  .concept-pill {
    padding: 5px 14px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-family: var(--mono);
    border: 1px solid;
  }

  .pill-aes { border-color: rgba(0,212,255,0.5); color: var(--accent); background: rgba(0,212,255,0.06); }
  .pill-rsa { border-color: rgba(0,255,157,0.5); color: var(--accent2); background: rgba(0,255,157,0.06); }
  .pill-sha { border-color: rgba(255,183,0,0.5); color: var(--warn); background: rgba(255,183,0,0.06); }
  .pill-sig { border-color: rgba(255,107,53,0.5); color: var(--accent3); background: rgba(255,107,53,0.06); }

  /* Section hidden */
  .panel { display: none; }
  .panel.active { display: block; }

  /* Timer bar */
  .timer-bar-wrap {
    background: var(--surface2);
    border-radius: 4px;
    height: 4px;
    overflow: hidden;
    margin-top: 8px;
  }

  .timer-bar {
    height: 100%;
    background: var(--accent3);
    border-radius: 4px;
    transition: width 1s linear;
  }

  /* Divider */
  .divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0;
    color: var(--text-dim);
    font-size: 0.7rem;
    font-family: var(--mono);
  }
  .divider::before, .divider::after {
    content: ''; flex: 1; height: 1px; background: var(--border);
  }

  /* Scrollbar */
  ::-webkit-scrollbar { width: 6px; height: 6px; }
  ::-webkit-scrollbar-track { background: var(--surface); }
  ::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
  ::-webkit-scrollbar-thumb:hover { background: var(--accent); }

  /* Responsive */
  @media (max-width: 600px) {
    .process-steps { grid-template-columns: 1fr 1fr; }
    .file-item { flex-wrap: wrap; }
    .file-actions { width: 100%; }
  }