:root {
    --bg: #050816;
    --bg-soft: #0b1020;
    --accent: #4f46e5;
    --accent-soft: rgba(79, 70, 229, 0.12);
    --text: #f9fafb;
    --muted: #9ca3af;
    --border: #1f2937;
    --danger: #ef4444;
    --radius-lg: 18px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.8);
    --shadow-card: 0 14px 35px rgba(15, 23, 42, 0.7);
    --transition-fast: 0.18s ease-out;
    --transition-med: 0.25s ease-out;
    --max-width: 1120px;
  }

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

  body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
      "Segoe UI", sans-serif;
    background: radial-gradient(circle at top, #111827, #020617 55%, #000 100%);
    color: var(--text);
    min-height: 100vh;
  }

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

  .page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
  }

  .container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
  }

  /* HEADER */
  header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(16px);
    background: linear-gradient(
      to bottom,
      rgba(15, 23, 42, 0.92),
      rgba(15, 23, 42, 0.75),
      transparent
    );
    border-bottom: 1px solid rgba(148, 163, 184, 0.18);
  }

  .nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 0.65rem;
  }

  .brand-logo {
    width: 34px;
    height: 34px;
    border-radius: 999px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    box-shadow:
      0 0 30px rgba(79, 70, 229, 0.45),
      0 0 4px rgba(148, 163, 184, 0.8);
    background: radial-gradient(circle at 30% 0%, #e5e7eb, #4f46e5 55%, #020617);
  }

  .brand-text {
    display: flex;
    flex-direction: column;
    gap: 0.05rem;
  }

  .brand-name {
    font-weight: 700;
    letter-spacing: 0.04em;
    font-size: 0.95rem;
  }

  .brand-tagline {
    font-size: 0.72rem;
    color: var(--muted);
  }

  .nav-links {
    display: flex;
    align-items: center;
    gap: 1.3rem;
    font-size: 0.9rem;
  }

  .nav-links a {
    color: var(--muted);
    padding: 0.25rem 0;
    border-bottom: 2px solid transparent;
    transition: color var(--transition-fast), border-color var(--transition-fast),
      transform var(--transition-fast);
  }

  .nav-links a:hover {
    color: #e5e7eb;
    border-color: rgba(129, 140, 248, 0.7);
    transform: translateY(-1px);
  }

  .nav-cta {
    padding: 0.45rem 0.9rem;
    border-radius: 999px;
    border: 1px solid rgba(129, 140, 248, 0.6);
    background: radial-gradient(circle at top left, #4f46e5, #0f172a);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.4);
    cursor: pointer;
  }

  .nav-cta span:last-child {
    font-size: 1rem;
    transform: translateY(0.5px);
  }

  /* HERO */

  .hero {
    padding: 3rem 0 2.5rem;
    position: relative;
    overflow: hidden;
  }

  .hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 2.5rem;
    align-items: center;
    position: relative;
    z-index: 1;
  }

  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.18rem 0.6rem;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.45);
    background: radial-gradient(circle at top left, #111827, #020617);
    font-size: 0.7rem;
    color: var(--muted);
    margin-bottom: 1.2rem;
  }

  .hero-badge-dot {
    width: 7px;
    height: 7px;
    border-radius: 999px;
    background: #22c55e;
    box-shadow: 0 0 10px rgba(34, 197, 94, 0.9);
  }

  .hero-title {
    font-size: clamp(2.1rem, 3.3vw + 1rem, 3rem);
    line-height: 1.08;
    letter-spacing: -0.05em;
    margin-bottom: 0.8rem;
  }

  .hero-title span.accent {
    background: linear-gradient(120deg, #4f46e5, #a855f7, #ec4899);
    -webkit-background-clip: text;
    color: transparent;
  }

  .hero-subtitle {
    font-size: 0.98rem;
    color: var(--muted);
    max-width: 480px;
    line-height: 1.6;
    margin-bottom: 1.6rem;
  }

  .hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.9rem;
    margin-bottom: 1.6rem;
  }

  .btn-primary {
    border-radius: 999px;
    padding: 0.8rem 1.4rem;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    border: none;
    background: linear-gradient(135deg, #4f46e5, #6366f1, #8b5cf6);
    color: #eef2ff;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    cursor: pointer;
    box-shadow: 0 18px 50px rgba(79, 70, 229, 0.6);
    transition: transform var(--transition-med), box-shadow var(--transition-med);
  }

  .btn-primary:hover {
    transform: translateY(-1px) scale(1.01);
    box-shadow: 0 22px 60px rgba(79, 70, 229, 0.75);
  }

  .btn-secondary {
    border-radius: 999px;
    padding: 0.78rem 1.3rem;
    border: 1px solid rgba(148, 163, 184, 0.6);
    background: radial-gradient(circle at top left, #111827, #020617);
    color: #e5e7eb;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    cursor: pointer;
    transition: border-color var(--transition-fast), background var(--transition-fast),
      transform var(--transition-fast), box-shadow var(--transition-fast);
  }

  .btn-secondary:hover {
    border-color: rgba(129, 140, 248, 0.9);
    background: radial-gradient(circle at top, #020617, #020617);
    transform: translateY(-1px);
    box-shadow: 0 14px 32px rgba(15, 23, 42, 0.85);
  }

  .hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.4rem;
    font-size: 0.8rem;
    color: var(--muted);
  }

  .hero-meta-item strong {
    display: block;
    color: #e5e7eb;
    font-size: 0.9rem;
  }

  /* HERO – SEARCH & TOOL PREVIEW */

  .hero-panel {
    background: radial-gradient(circle at top, #020617, #020617 52%, #000 110%);
    border-radius: 28px;
    border: 1px solid rgba(148, 163, 184, 0.28);
    box-shadow: var(--shadow-soft);
    padding: 1.6rem 1.6rem 1.8rem;
    position: relative;
    overflow: hidden;
  }

  .hero-panel::before {
    content: "";
    position: absolute;
    inset: -40%;
    background: radial-gradient(
      circle at 10% 0%,
      rgba(79, 70, 229, 0.16),
      transparent 55%
    );
    pointer-events: none;
  }

  .hero-panel-inner {
    position: relative;
    z-index: 1;
  }

  .search-label {
    font-size: 0.8rem;
    color: var(--muted);
    margin-bottom: 0.35rem;
  }

  .search-wrapper {
    position: relative;
    margin-bottom: 1.1rem;
  }

  .search-input {
    width: 100%;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.5);
    background: radial-gradient(circle at top left, #020617, #020617);
    padding: 0.72rem 2.4rem 0.72rem 0.9rem;
    color: var(--text);
    font-size: 0.88rem;
    outline: none;
    box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.9);
    transition: border-color var(--transition-fast),
      box-shadow var(--transition-fast), background var(--transition-fast),
      transform var(--transition-fast);
  }

  .search-input::placeholder {
    color: #6b7280;
  }

  .search-input:focus {
    border-color: #818cf8;
    box-shadow:
      0 0 0 1px rgba(129, 140, 248, 0.6),
      0 18px 40px rgba(15, 23, 42, 0.9);
    transform: translateY(-0.5px);
    background: radial-gradient(circle at top left, #020617, #020617);
  }

  .search-icon {
    position: absolute;
    right: 0.9rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1rem;
    color: #6b7280;
  }

  .tool-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.1rem;
  }

  .tool-tag {
    font-size: 0.74rem;
    padding: 0.2rem 0.7rem;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.45);
    color: var(--muted);
    cursor: pointer;
    background: radial-gradient(circle at top left, #020617, #020617);
    transition: border-color var(--transition-fast), color var(--transition-fast),
      background var(--transition-fast), transform var(--transition-fast);
  }

  .tool-tag:hover {
    border-color: rgba(129, 140, 248, 0.9);
    color: #e5e7eb;
    transform: translateY(-1px);
    background: radial-gradient(circle at top, #020617, #020617);
  }

  .tool-tag.active {
    background: radial-gradient(circle at top left, #4f46e5, #7c3aed);
    color: #eef2ff;
    border-color: transparent;
    box-shadow: 0 10px 30px rgba(79, 70, 229, 0.45);
  }

  .tool-preview {
    margin-top: 1.1rem;
    padding: 1rem;
    border-radius: 18px;
    border: 1px solid rgba(55, 65, 81, 0.9);
    background: radial-gradient(circle at top left, #020617, #020617);
  }

  .tool-preview-title {
    font-size: 0.95rem;
    margin-bottom: 0.55rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
  }

  .pill {
    font-size: 0.7rem;
    padding: 0.18rem 0.6rem;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.85);
    border: 1px solid rgba(148, 163, 184, 0.4);
    color: var(--muted);
  }

  .tool-preview-desc {
    font-size: 0.8rem;
    color: var(--muted);
    margin-bottom: 0.7rem;
  }

  .preview-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.7rem;
  }

  .preview-metric {
    border-radius: 12px;
    border: 1px solid rgba(55, 65, 81, 0.9);
    padding: 0.55rem 0.7rem;
    font-size: 0.75rem;
    background: radial-gradient(circle at top left, #020617, #020617);
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
  }

  .preview-metric span:first-child {
    color: var(--muted);
  }

  .preview-metric strong {
    font-size: 0.9rem;
  }

  /* TOOL GRID */

  .section {
    padding: 1.5rem 0 3.5rem;
  }

  .section-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
  }

  .section-title {
    font-size: 1.15rem;
    letter-spacing: -0.03em;
  }

  .section-subtitle {
    font-size: 0.86rem;
    color: var(--muted);
    max-width: 420px;
    line-height: 1.5;
  }

  .tool-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
  }

  @media (max-width: 920px) {
    .hero-inner {
      grid-template-columns: minmax(0, 1fr);
    }

    .hero-panel {
      order: -1;
      margin-bottom: 1.2rem;
    }

    .section-header {
      flex-direction: column;
      align-items: flex-start;
    }
  }

  @media (max-width: 768px) {
    .tool-grid {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .nav-links {
      display: none;
    }
  }

  @media (max-width: 600px) {
    .tool-grid {
      grid-template-columns: minmax(0, 1fr);
    }

    .hero {
      padding-top: 2.2rem;
    }

    .hero-panel {
      border-radius: 22px;
      padding: 1.3rem 1.2rem 1.4rem;
    }
  }

  .tool-card {
    border-radius: var(--radius-lg);
    border: 1px solid rgba(55, 65, 81, 0.9);
    background: radial-gradient(circle at top left, #020617, #020617);
    padding: 0.9rem 0.95rem;
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    cursor: pointer;
    transform-origin: center;
    transition: transform var(--transition-med), box-shadow var(--transition-med),
      border-color var(--transition-med), background var(--transition-med),
      opacity var(--transition-fast);
  }

  .tool-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 22px 55px rgba(15, 23, 42, 0.95);
    border-color: rgba(129, 140, 248, 0.9);
    background: radial-gradient(circle at top, #020617, #020617);
  }

  .tool-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.4rem;
  }

  .tool-card-title {
    font-size: 0.95rem;
    font-weight: 600;
  }

  .tool-card-tag {
    font-size: 0.7rem;
    padding: 0.12rem 0.55rem;
    border-radius: 999px;
    background: var(--accent-soft);
    border: 1px solid rgba(129, 140, 248, 0.85);
    color: #c7d2fe;
  }

  .tool-card-desc {
    font-size: 0.8rem;
    color: var(--muted);
  }

  .tool-card-meta {
    font-size: 0.74rem;
    color: #6b7280;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.1rem;
  }

  .tool-card-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.2rem;
  }

  /* TOOL SECTIONS (functional) */

  .tool-section {
    border-radius: 20px;
    border: 1px solid rgba(55, 65, 81, 0.9);
    background: radial-gradient(circle at top left, #020617, #020617);
    padding: 1.2rem 1.1rem 1.4rem;
    box-shadow: var(--shadow-card);
    margin-bottom: 1.4rem;
  }

  .tool-section h3 {
    font-size: 1rem;
    margin-bottom: 0.2rem;
  }

  .tool-section p {
    font-size: 0.8rem;
    color: var(--muted);
    margin-bottom: 0.9rem;
  }

  .tool-form {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.8rem;
    align-items: end;
  }

  @media (max-width: 600px) {
    .tool-form {
      grid-template-columns: minmax(0, 1fr);
    }
  }

  .field {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    font-size: 0.8rem;
  }

  .field label {
    color: var(--muted);
  }

  .field input,
  .field select,
  .field textarea {
    border-radius: var(--radius-sm);
    border: 1px solid rgba(75, 85, 99, 0.9);
    background: radial-gradient(circle at top left, #020617, #020617);
    color: var(--text);
    padding: 0.45rem 0.55rem;
    font-size: 0.85rem;
    outline: none;
    transition: border-color var(--transition-fast),
      box-shadow var(--transition-fast), background var(--transition-fast);
  }

  .field input::placeholder {
    color: #6b7280;
  }

  .field input:focus,
  .field select:focus,
  .field textarea:focus {
    border-color: #818cf8;
    box-shadow:
      0 0 0 1px rgba(129, 140, 248, 0.6),
      0 14px 32px rgba(15, 23, 42, 0.9);
    background: radial-gradient(circle at top left, #020617, #020617);
  }

  .btn-tool {
    border-radius: var(--radius-sm);
    border: none;
    padding: 0.55rem 0.85rem;
    font-size: 0.84rem;
    background: linear-gradient(135deg, #4f46e5, #6366f1);
    color: #e5e7eb;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    cursor: pointer;
    transition: transform var(--transition-fast),
      box-shadow var(--transition-fast), opacity var(--transition-fast);
    box-shadow: 0 12px 28px rgba(79, 70, 229, 0.5);
  }

  .btn-tool:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 36px rgba(79, 70, 229, 0.7);
  }

  .tool-result {
    margin-top: 0.7rem;
    font-size: 0.86rem;
  }

  .tool-result strong {
    color: #e5e7eb;
  }

  .tool-result span {
    color: var(--muted);
    font-size: 0.78rem;
    display: block;
    margin-top: 0.1rem;
  }

  .small-note {
    font-size: 0.72rem;
    color: #6b7280;
    margin-top: 0.4rem;
  }

  .range-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .range-row input[type="range"] {
    flex: 1;
  }

  .chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
  }

  .chip {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.72rem;
    padding: 0.18rem 0.5rem;
    border-radius: 999px;
    border: 1px solid rgba(75, 85, 99, 0.9);
    background: radial-gradient(circle at top left, #020617, #020617);
    color: var(--muted);
    cursor: pointer;
    transition: border-color var(--transition-fast),
      background var(--transition-fast), color var(--transition-fast);
  }

  .chip input {
    margin: 0;
  }

  .chip:hover {
    border-color: #818cf8;
    color: #e5e7eb;
  }

  .password-output {
    margin-top: 0.65rem;
    padding: 0.45rem 0.55rem;
    border-radius: var(--radius-sm);
    border: 1px dashed rgba(75, 85, 99, 0.9);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
      "Liberation Mono", "Courier New", monospace;
    font-size: 0.8rem;
    word-break: break-all;
    background: radial-gradient(circle at top left, #020617, #020617);
    color: #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
  }

  .copy-btn {
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.5);
    padding: 0.18rem 0.55rem;
    font-size: 0.7rem;
    background: rgba(15, 23, 42, 0.8);
    color: var(--muted);
    cursor: pointer;
    transition: border-color var(--transition-fast), transform var(--transition-fast),
      background var(--transition-fast), color var(--transition-fast);
    white-space: nowrap;
  }

  .copy-btn:hover {
    border-color: rgba(129, 140, 248, 0.9);
    color: #e5e7eb;
    transform: translateY(-0.5px);
    background: rgba(15, 23, 42, 1);
  }

  /* FOOTER */

  footer {
    border-top: 1px solid rgba(30, 64, 175, 0.6);
    background: radial-gradient(circle at top, #020617, #020617);
    margin-top: auto;
  }

  .footer-inner {
    padding: 1rem 0 1.4rem;
    font-size: 0.75rem;
    color: #6b7280;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: space-between;
    align-items: center;
  }

  .footer-links {
    display: flex;
    gap: 0.9rem;
    flex-wrap: wrap;
  }

  .footer-links a {
    color: #6b7280;
    transition: color var(--transition-fast), transform var(--transition-fast);
  }

  .footer-links a:hover {
    color: #e5e7eb;
    transform: translateY(-0.5px);
  }

  /* IMPORTANT: for filtering, completely hide cards */
  .hidden {
    display: none;
  }

  .tools-grid {
display: grid;
gap: 1.5rem;
grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
margin-top: 2rem;
}

.social-share {
margin-top: 40px;
text-align: center;
}

.social-share a {
margin: 0 10px;
color: var(--accent);
font-weight: 600;
text-decoration: none;
}

.social-share a:hover {
text-decoration: underline;
}

.lang-switch {
text-align: right;
margin: 1rem 2rem;
font-size: 0.9rem;
}

.lang-switch a {
color: #a5b4fc;
text-decoration: none;
}

.lang-switch a:hover {
text-decoration: underline;
}