:root {
  --color-bg: #f7f8fb;
  --color-surface: #ffffff;
  --color-border: #e4e7ec;
  --color-text: #1a1d29;
  --color-text-muted: #6b7280;
  --color-primary: #4f46e5;
  --color-primary-light: #818cf8;
  --color-primary-dark: #4338ca;
  --color-accent: #22d3ee;
  --color-danger: #dc2626;
  --color-dark: #0b0f19;
  --color-dark-2: #121a2e;
  --mono: "SFMono-Regular", Consolas, Menlo, monospace;
  --radius: 12px;
  --radius-lg: 18px;
  --shadow-sm: 0 1px 3px rgba(20, 20, 40, .05);
  --shadow-md: 0 8px 20px rgba(20, 20, 40, .09);
  --shadow-lg: 0 20px 48px rgba(20, 20, 40, .16);
  --shadow-glow: 0 10px 30px rgba(79, 70, 229, .18);
  --container-width: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 16px;
}

a { color: var(--color-primary); text-decoration: none; }

::selection { background: var(--color-primary); color: #fff; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #d8dbe0; border-radius: 8px; border: 2px solid var(--color-bg); }
::-webkit-scrollbar-thumb:hover { background: #c3c7cd; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--color-dark);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.site-header::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-primary), #ec4899);
}
.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 1.25rem; color: #f8fafc; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff; font-size: .85rem;
  box-shadow: 0 0 14px rgba(34, 211, 238, .45);
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span { width: 22px; height: 2px; background: #e5e7eb; border-radius: 2px; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}
.auth-area { display: flex; align-items: center; gap: 12px; }
.user-area { display: flex; align-items: center; gap: 10px; }
.user-email { font-size: 0.9rem; color: #94a3b8; }
.user-credits {
  font: 600 .75rem/1 var(--mono);
  background: rgba(34, 211, 238, .12);
  color: var(--color-accent);
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid rgba(34, 211, 238, .3);
}
.site-nav > a { font-weight: 600; font-size: .92rem; color: #cbd5e1; transition: color .15s; }
.site-nav > a:hover { color: var(--color-accent); }
.site-header .btn--ghost { border-color: rgba(255, 255, 255, .22); color: #e5e7eb; }
.site-header .btn--ghost:hover { background: rgba(255, 255, 255, .08); border-color: var(--color-accent); color: var(--color-accent); }

@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 20px;
    gap: 14px;
    display: none;
  }
  .site-nav.is-open { display: flex; }
  .site-nav > a { color: var(--color-text); }
  .auth-area { flex-direction: column; align-items: stretch; }
  .user-area { flex-direction: column; align-items: flex-start; }
  .site-header .btn--ghost { border-color: var(--color-border); color: var(--color-text); }
  .site-header .btn--ghost:hover { background: var(--color-bg); border-color: var(--color-primary); color: var(--color-primary); }
}
@media (min-width: 721px) {
  .nav-toggle { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 8px 16px;
  font-size: 0.9rem;
  cursor: pointer;
  font-weight: 600;
  transition: background .15s, border-color .15s, color .15s, transform .15s, box-shadow .15s;
}
.btn--primary { background: var(--color-primary); color: #fff; width: 100%; box-shadow: 0 3px 10px rgba(79, 70, 229, .25); }
.btn--primary:hover { background: var(--color-primary-dark); box-shadow: 0 5px 14px rgba(79, 70, 229, .35); transform: translateY(-1px); }
.btn--ghost { background: transparent; border-color: var(--color-border); color: var(--color-text); }
.btn--ghost:hover { background: var(--color-bg); border-color: var(--color-primary); color: var(--color-primary); transform: translateY(-1px); }

/* ---------- Hero / Home ---------- */
.hero {
  position: relative; overflow: hidden;
  text-align: center; padding: 60px 24px; margin: 20px 0 8px;
  background-color: var(--color-dark);
  background-image:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px),
    radial-gradient(circle at 15% 20%, rgba(99, 102, 241, .45), transparent 42%),
    radial-gradient(circle at 85% 30%, rgba(34, 211, 238, .32), transparent 42%);
  background-size: 28px 28px, 28px 28px, auto, auto;
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}
.hero-kicker {
  position: relative; z-index: 1;
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .14);
  color: #cbd5e1; font: 600 .78rem/1 var(--mono); letter-spacing: .02em;
  padding: 6px 14px; border-radius: 999px; margin-bottom: 16px;
}
.hero-kicker .dot {
  width: 6px; height: 6px; border-radius: 50%; background: #4ade80;
  box-shadow: 0 0 8px #4ade80; animation: pulse 2s infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .4; } }
.hero h1 { position: relative; z-index: 1; color: #f8fafc; font-size: 2.1rem; font-weight: 800; letter-spacing: -.01em; margin-bottom: 8px; }
.hero p { position: relative; z-index: 1; color: #94a3b8; }

/* Category jump-nav on the homepage (the "categories + list" index) */
.category-nav {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin: 20px 0 8px;
}
.category-nav a {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: 999px; padding: 7px 14px;
  font-size: 0.88rem; font-weight: 600; color: var(--color-text);
  box-shadow: var(--shadow-sm);
  transition: border-color .15s, color .15s, box-shadow .15s, transform .15s;
}
.category-nav a:hover {
  border-color: var(--color-primary); color: var(--color-primary);
  box-shadow: var(--shadow-glow); transform: translateY(-1px);
}
.category-nav__count {
  font: 600 .72rem/1 var(--mono);
  background: var(--color-bg); color: var(--color-text-muted);
  padding: 2px 7px; border-radius: 999px;
}

.tool-category { margin: 32px 0; scroll-margin-top: 76px; }
.tool-category h2 {
  position: relative;
  font-size: 1.25rem; font-weight: 700; margin: 0 0 16px; padding-left: 14px;
}
.tool-category h2::before {
  content: ""; position: absolute; left: 0; top: 3px; bottom: 3px; width: 4px;
  border-radius: 2px; background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.home-benefits {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.home-benefit {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.home-benefit h3 { margin: 0 0 6px; font-size: 0.98rem; color: var(--color-text); }
.home-benefit p { margin: 0; font-size: 0.88rem; color: var(--color-text-muted); }

.home-faq h3 { font-size: 0.95rem; color: var(--color-text); margin: 16px 0 4px; }
.home-faq h3:first-of-type { margin-top: 0; }
.home-faq p { margin: 0; font-size: 0.88rem; color: var(--color-text-muted); }
.tool-card {
  position: relative;
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.15s, transform 0.15s, border-color 0.15s;
}
.tool-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0); transform-origin: left; transition: transform .18s;
}
.tool-card:hover::before { transform: scaleX(1); }
.tool-card:hover { box-shadow: var(--shadow-glow); border-color: transparent; transform: translateY(-2px); }
.tool-card__icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 12px;
  background: linear-gradient(135deg, var(--color-dark), var(--color-dark-2));
  border: 1px solid rgba(99, 102, 241, .35);
  box-shadow: 0 0 12px rgba(99, 102, 241, .2);
  font-size: 1.4rem;
}
.tool-card__name { font-weight: 600; color: var(--color-text); }
.tool-card__desc { font-size: 0.85rem; color: var(--color-text-muted); }

/* ---------- Tool page ---------- */
.breadcrumb { margin: 20px 0 8px; font-size: 0.85rem; color: var(--color-text-muted); }
.tool-page { padding-bottom: 48px; }
.tool-page__header { display: flex; align-items: center; gap: 16px; margin: 12px 0 20px; }
.tool-icon {
  display: inline-flex; align-items: center; justify-content: center;
  flex: 0 0 auto; width: 56px; height: 56px; border-radius: 14px;
  background: linear-gradient(135deg, var(--color-dark), var(--color-dark-2));
  border: 1px solid rgba(99, 102, 241, .35);
  box-shadow: 0 0 16px rgba(99, 102, 241, .22);
  font-size: 1.8rem;
}
.tool-page__desc { color: var(--color-text-muted); margin: 4px 0 0; }

.tool-page__body {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}
@media (max-width: 480px) {
  .tool-page__body { padding: 16px; }
}

.usage-banner {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 12px;
  min-height: 1.2em;
}
.usage-banner--blocked { color: var(--color-danger); font-weight: 600; }

/* generic form bits reused across tools */
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.field label { font-size: 0.85rem; font-weight: 600; }
.field input, .field select, .field textarea {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 1rem;
  width: 100%;
  font-family: inherit;
  transition: border-color .15s, box-shadow .15s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, .12);
}
.field textarea { font-family: "SFMono-Regular", Consolas, Menlo, monospace; }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; }
.checkbox-field { display: flex; align-items: center; gap: 8px; font-size: 0.9rem; font-weight: normal; }
.checkbox-field input { width: auto; }

.result-box {
  --color-text-muted: #94a3b8;
  position: relative;
  margin-top: 16px;
  padding: 34px 16px 16px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-dark), var(--color-dark-2));
  border: 1px solid rgba(99, 102, 241, .3);
  border-left: 3px solid var(--color-accent);
  color: #e2e8f0;
  font-family: var(--mono);
  box-shadow: var(--shadow-glow);
}
.result-box::before {
  content: "OUTPUT"; position: absolute; top: 12px; left: 16px;
  font: 700 .65rem/1 var(--mono); letter-spacing: .12em; color: var(--color-accent); opacity: .8;
}
.result-box__value { font-size: 1.6rem; font-weight: 700; color: var(--color-accent); }
.result-box.is-error {
  background: linear-gradient(135deg, #1f0a0a, #2a0f0f);
  border-color: rgba(220, 38, 38, .4); border-left-color: var(--color-danger);
  color: #fecaca;
}
.result-box.is-error::before { content: "ERROR"; color: var(--color-danger); }
.result-box textarea, .result-box pre {
  background: transparent; border: none; color: inherit; font-family: inherit;
  padding: 0; width: 100%; resize: vertical;
}
.result-box .btn--ghost { border-color: rgba(255, 255, 255, .22); color: #e5e7eb; }
.result-box .btn--ghost:hover { background: rgba(255, 255, 255, .08); border-color: var(--color-accent); color: var(--color-accent); }

.dropzone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: border-color .15s, color .15s, background .15s, transform .15s;
}
.dropzone:hover { border-color: var(--color-primary); color: var(--color-primary); background: #f5f6ff; }
.dropzone.is-dragover { border-color: var(--color-primary); color: var(--color-primary); background: #eef2ff; transform: scale(1.01); }

/* ---------- Modal ---------- */
.modal { position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center; }
.modal[hidden] { display: none; }
.modal__backdrop { position: absolute; inset: 0; background: rgba(17, 19, 28, 0.5); backdrop-filter: blur(2px); }
.modal__panel {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 90%;
  max-width: 380px;
  box-shadow: var(--shadow-lg);
}
.modal__close { position: absolute; top: 12px; right: 14px; border: none; background: none; font-size: 1.4rem; cursor: pointer; color: var(--color-text-muted); transition: color .15s, transform .15s; }
.modal__close:hover { color: var(--color-danger); transform: rotate(90deg); }
.modal__hint { color: var(--color-text-muted); font-size: 0.85rem; margin-top: -8px; margin-bottom: 16px; }
.stack { display: flex; flex-direction: column; gap: 10px; }
.stack input {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 1rem;
  transition: border-color .15s, box-shadow .15s;
}
.stack input:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, .12); }
.auth-message { min-height: 1.2em; font-size: 0.85rem; color: var(--color-danger); margin-top: 10px; margin-bottom: 0; }

.tool-info {
  margin-top: 32px; color: var(--color-text-muted); font-size: 0.9rem;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 20px 24px; box-shadow: var(--shadow-sm);
}
.tool-info h2 { font-size: 1.05rem; color: var(--color-text); margin-bottom: 8px; }
.tool-info h3 { font-size: 0.95rem; color: var(--color-text); margin: 16px 0 4px; }
.tool-info ul { padding-left: 20px; margin: 8px 0 0; }
.tool-info li { margin-bottom: 4px; }

/* ---------- Tool output utilities (avoid inline style= for CSP) ---------- */
.tool-preview-img { max-width: 100%; border-radius: 8px; }
.tool-note { margin-top: 8px; font-size: 0.85rem; color: var(--color-text-muted); }
.tool-actions { margin-top: 12px; }
.tool-output-mono { white-space: pre-wrap; word-break: break-all; margin: 0; }
.tool-output-pw { font-family: 'SFMono-Regular', Consolas, Menlo, monospace; font-size: 1.15rem; word-break: break-all; }
.tool-copy-btn { margin-top: 10px; }
.tool-generate-btn { margin-top: 14px; }
.color-swatch {
  height: 64px; border-radius: 8px; margin-bottom: 12px;
  border: 1px solid rgba(255, 255, 255, .18);
}
.jwt-part {
  font: 700 .65rem/1 var(--mono); letter-spacing: .12em;
  color: var(--color-accent); opacity: .8; margin: 12px 0 4px;
}
.qr-canvas {
  display: block; max-width: 100%; height: auto;
  image-rendering: pixelated; border-radius: 8px; background: #fff;
}
.qr-error { color: var(--color-danger); }
.qr-panel { margin-bottom: 4px; }
.btn--sm { padding: 2px 10px; font-size: .8rem; margin-left: 6px; }
.qr-warn { color: #d97706; }
.qr-ok { color: #059669; }
.pw-strength--weak { color: #f87171; }
.pw-strength--medium { color: #fbbf24; }
.pw-strength--strong { color: #4ade80; }

.jf-string { color: #4ade80; }
.jf-number { color: #fbbf24; }
.jf-boolean { color: #a78bfa; }
.jf-null { color: #94a3b8; }
.jf-key { color: #60a5fa; }

/* ---------- Footer / Ads ---------- */
.site-footer {
  position: relative;
  margin-top: 56px; padding: 28px 0;
  background: var(--color-dark); color: #94a3b8;
  font-size: 0.85rem; text-align: center;
}
.site-footer::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-primary), #ec4899);
}
.ad-slot { text-align: center; margin: 16px 0; }