:root {
  --bg: #0b0e14;
  --panel: #131826;
  --text: #e8ecf4;
  --muted: #8b93a7;
  --accent: #4f7cff;
  --accent-hover: #3a63e0;
  --border: #232b40;
  --ok: #34c77b;
  --err: #e05656;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.logo {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text);
  text-decoration: none;
}

.nav nav { display: flex; gap: 1rem; align-items: center; }
.nav nav a { color: var(--muted); text-decoration: none; }
.nav nav a:hover { color: var(--text); }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff !important;
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { background: var(--accent-hover); }
.btn:disabled { opacity: 0.6; cursor: wait; }

.container {
  flex: 1;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.empty { min-height: 40vh; }

h1 { font-size: 2rem; margin: 0 0 0.5rem; }
.sub { color: var(--muted); margin: 0 0 2rem; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

label { display: block; margin: 1rem 0 0.4rem; color: var(--muted); font-size: 0.9rem; }
label:first-child { margin-top: 0; }

input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.7rem 0.9rem;
  font-size: 1rem;
}
input:focus { outline: none; border-color: var(--accent); }

form .btn { margin-top: 1.25rem; width: 100%; }

.result { margin-top: 1.5rem; }
.result a { color: var(--accent); font-size: 1.2rem; font-weight: 600; word-break: break-all; }

.copy-row { display: flex; gap: 0.75rem; margin-top: 0.75rem; align-items: center; }
.copy-row .btn { width: auto; margin-top: 0; padding: 0.5rem 1rem; font-size: 0.9rem; }
.hint { color: var(--muted); font-size: 0.85rem; }

.error { color: var(--err); margin-top: 1rem; }
.ok-msg { color: var(--ok); font-size: 0.9rem; }

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
}

.center { text-align: center; }
.big { font-size: 4rem; margin: 0; }

/* --- home landing page --- */
html { scroll-behavior: smooth; }

.home { max-width: 900px; }

.hero { text-align: center; padding: 2.5rem 0 1.5rem; }
.hero-title { font-size: 2.75rem; line-height: 1.1; }
.hero-sub { font-size: 1.1rem; }

.cta-row { display: flex; gap: 0.75rem; justify-content: center; margin-top: 1.5rem; flex-wrap: wrap; }

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text) !important;
}
.btn-ghost:hover { border-color: var(--accent); background: transparent; }

.section { margin-top: 3.5rem; }
.section h2 { text-align: center; margin: 0 0 1.5rem; font-size: 1.5rem; }

.steps, .features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.step, .feature {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

.step-num {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.step h3, .feature h3 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.step p, .feature p { margin: 0; color: var(--muted); font-size: 0.95rem; }

@media (max-width: 560px) {
  .hero-title { font-size: 2rem; }
  .hero { padding-top: 1.5rem; }
}

/* --- tools index + tool pages --- */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.tool-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  text-decoration: none;
  color: var(--text);
  display: block;
}
.tool-card:hover { border-color: var(--accent); }
.tool-card h3 { margin: 0 0 0.4rem; font-size: 1.05rem; }
.tool-card p { margin: 0; color: var(--muted); font-size: 0.9rem; }

.category { margin-top: 2.5rem; }
.category h2 { font-size: 1.25rem; margin: 0 0 0.25rem; }

.hint a { color: var(--accent); }

textarea {
  width: 100%;
  min-height: 140px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.7rem 0.9rem;
  font-size: 0.95rem;
  font-family: inherit;
  resize: vertical;
}
textarea:focus { outline: none; border-color: var(--accent); }
textarea.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

select {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 0.6rem 0.8rem;
  font-size: 1rem;
}
input[type="checkbox"] { width: auto; }
input[type="range"] { width: 100%; }

.row { display: flex; gap: 0.75rem; flex-wrap: wrap; align-items: center; margin-top: 1rem; }
.row .btn { width: auto; margin-top: 0; }
.row label { margin: 0; }

.output {
  margin-top: 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.9rem;
  word-break: break-all;
  white-space: pre-wrap;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9rem;
}
.output:empty { display: none; }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}
.stat {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.8rem 0.5rem;
  text-align: center;
}
.stat b { display: block; font-size: 1.4rem; }
.stat span { color: var(--muted); font-size: 0.8rem; }

.checks { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 0.75rem; }
.checks label { display: flex; gap: 0.35rem; align-items: center; margin: 0; }

canvas.preview, img.preview {
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-top: 1rem;
  background: #fff;
}

.file-list { margin: 1rem 0 0; padding-left: 1.25rem; color: var(--muted); }
mark { background: var(--accent); color: #fff; border-radius: 3px; padding: 0 1px; }