/*
 * Email Domains Mapper - landing page styles
 *
 * Theme is driven by CSS custom properties (variables) on :root.
 * Light mode is the default; dark mode overrides via a media query
 * (prefers-color-scheme) and via an explicit [data-theme] attribute
 * set by the toggle button in script.js.
 *
 * Every color in the UI references one of these variables, so switching
 * themes is just a matter of swapping the variable values.
 */

/* ---------- Theme tokens ---------- */
:root {
  --bg: #f8fafc;        /* page background */
  --bg2: #f1f5f9;       /* input / code background */
  --fg: #0f172a;        /* primary text */
  --muted: #64748b;     /* secondary text, labels */
  --accent: #2563eb;    /* primary action color (buttons, links) */
  --accent2: #0891b2;   /* secondary accent (unused now, kept for reuse) */
  --card: #ffffff;      /* card surface */
  --border: #e2e8f0;    /* borders */
  --ok: #16a34a;        /* success */
  --warn: #d97706;      /* warning */
  --err: #dc2626;       /* error */
  --accent-fg: #ffffff; /* text on accent-colored buttons */
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
}

/* Dark mode via OS preference (used when the toggle is set to "Auto") */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a; --bg2: #1e293b; --fg: #e2e8f0; --muted: #94a3b8;
    --accent: #60a5fa; --accent2: #22d3ee; --card: #1e293b; --border: #334155;
    --ok: #4ade80; --warn: #fbbf24; --err: #f87171; --accent-fg: #0f172a;
    --shadow: 0 1px 3px rgba(0,0,0,.3), 0 1px 2px rgba(0,0,0,.2);
  }
}

/* Explicit overrides when the user picks a theme manually */
[data-theme="light"] {
  --bg: #f8fafc; --bg2: #f1f5f9; --fg: #0f172a; --muted: #64748b;
  --accent: #2563eb; --accent2: #0891b2; --card: #ffffff; --border: #e2e8f0;
  --ok: #16a34a; --warn: #d97706; --err: #dc2626; --accent-fg: #ffffff;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
}
[data-theme="dark"] {
  --bg: #0f172a; --bg2: #1e293b; --fg: #e2e8f0; --muted: #94a3b8;
  --accent: #60a5fa; --accent2: #22d3ee; --card: #1e293b; --border: #334155;
  --ok: #4ade80; --warn: #fbbf24; --err: #f87171; --accent-fg: #0f172a;
  --shadow: 0 1px 3px rgba(0,0,0,.3), 0 1px 2px rgba(0,0,0,.2);
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  transition: background .2s, color .2s;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Layout ---------- */
.wrap { max-width: 960px; margin: 0 auto; padding: 0 1.25rem; }

header { padding: 2.5rem 0 1.5rem; text-align: center; position: relative; }
header h1 { margin: 0 0 .25rem; font-size: 2.25rem; }
header p { color: var(--muted); margin: 0 0 1rem; }

/* Floating theme toggle in the top-right corner */
.theme-switch {
  position: absolute; top: 1rem; right: 0;
  display: flex; align-items: center; gap: .4rem;
  background: var(--bg2); border: 1px solid var(--border); border-radius: 999px;
  padding: .3rem 1.25rem .3rem .7rem; font-size: .85rem; cursor: pointer;
  user-select: none; color: var(--fg); transition: border-color .2s;
}
.theme-switch:hover { border-color: var(--accent); }

.badges { display: flex; flex-wrap: wrap; gap: .5rem; justify-content: center; margin: 1rem 0; max-width: 100%; }
.badges img { height: 20px; max-width: 100%; }

nav { display: flex; flex-wrap: wrap; gap: .75rem; justify-content: center; margin: 1rem 0 2rem; }
nav a { padding: .4rem .9rem; border: 1px solid var(--border); border-radius: 999px; font-size: .9rem;
        background: var(--bg2); transition: border-color .2s, background .2s; }
nav a:hover { border-color: var(--accent); text-decoration: none; background: var(--card); }

section { padding: 2rem 0; border-top: 1px solid var(--border); }
section h2 { margin-top: 0; font-size: 1.5rem; }
section h3 { font-size: 1.15rem; margin: 1.25rem 0 .5rem; color: var(--accent); }

/* ---------- Cards & features ---------- */
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px;
        padding: 1.25rem; margin: 1rem 0; box-shadow: var(--shadow); }

.features { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; margin: 1rem 0; }
.feature { display: flex; align-items: center; gap: .75rem; padding: 1rem 1.1rem; background: var(--card);
           border: 1px solid var(--border); border-radius: 10px; font-size: 1.05rem; box-shadow: var(--shadow);
           transition: border-color .2s, transform .1s; }
.feature:hover { border-color: var(--accent); transform: translateY(-1px); }
.feature i { font-size: 1.4rem; color: var(--accent); flex-shrink: 0; }
.feature span { font-weight: 500; }

/* ---------- Code output ---------- */
pre { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; overflow-x: auto;
      font-size: .85rem; margin: 0; color: var(--fg); overflow-wrap: anywhere; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
code.is-placeholder { color: var(--muted); }

/* ---------- Form controls ---------- */
.host-row { display: grid; grid-template-columns: 90px 1fr 80px; gap: .5rem; align-items: end; }
.host-row > * { min-width: 0; }

.mapping { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; margin: .75rem 0;
           box-shadow: var(--shadow); }
.mapping h4 { margin: 0 0 .5rem; font-size: 1rem; color: var(--accent); display: flex; justify-content: space-between; align-items: center; }

.row { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
.field { margin: .5rem 0; }
.field label { display: block; font-size: .85rem; color: var(--muted); margin-bottom: .25rem; }
.field input, .field select, .field textarea {
  width: 100%; padding: .5rem; border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg); color: var(--fg); font-size: .9rem; font-family: inherit;
  transition: border-color .2s, box-shadow .2s; min-width: 0;
}
/* Custom dropdown arrow so it never sticks to the right edge */
.field select {
  appearance: none; -webkit-appearance: none; -moz-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right .75rem center;
  padding-right: 2rem;
}
@media (prefers-color-scheme: dark) {
  .field select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M2 4l4 4 4-4'/%3E%3C/svg%3E"); }
}
[data-theme="light"] .field select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M2 4l4 4 4-4'/%3E%3C/svg%3E"); }
[data-theme="dark"] .field select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M2 4l4 4 4-4'/%3E%3C/svg%3E"); }

.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
}
.field input.invalid, .field select.invalid { border-color: var(--err); }
.err { font-size: .8rem; color: var(--err); margin-top: .2rem; min-height: 1rem; }

/* ---------- Buttons ---------- */
.btn { display: inline-block; padding: .5rem 1rem; border: 1px solid var(--border); border-radius: 6px; background: var(--bg2);
       color: var(--fg); cursor: pointer; font-size: .9rem; transition: border-color .2s, background .2s, transform .1s; }
.btn:hover { border-color: var(--accent); background: var(--card); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); font-weight: 600; }
.btn.primary:hover { filter: brightness(1.1); background: var(--accent); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn:disabled:hover { background: var(--bg2); border-color: var(--border); }
.btn.danger { border-color: var(--err); color: var(--err); }
.btn.danger:hover { background: color-mix(in srgb, var(--err) 10%, transparent); }
.btn.danger:disabled { opacity: .5; cursor: not-allowed; }
.btn.danger:disabled:hover { background: transparent; border-color: var(--err); }

.actions { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1rem 0; }
.note { font-size: .85rem; color: var(--muted); }
.warn { color: var(--warn); }
.ok { color: var(--ok); }

/* ---------- Footer ---------- */
.heart { color: #e11d48; font-size: 1em; vertical-align: -0.1em; }
footer { padding: 2rem 0; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 1rem; color: var(--muted); font-size: .85rem; }
footer .copy { }
footer .links { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }
footer .links a { display: inline-flex; align-items: center; gap: .35rem; color: var(--muted); }
footer .links a:hover { color: var(--accent); text-decoration: none; }
footer .links img { width: 14px; height: 14px; border-radius: 2px; background: #fff; padding: 1px; }

/* ---------- Back to top button ---------- */
.to-top { position: fixed; bottom: 1.5rem; right: 1.5rem; width: 42px; height: 42px; border-radius: 50%;
          display: flex; align-items: center; justify-content: center; font-size: 1.2rem;
          background: var(--accent); color: var(--accent-fg); border: none; cursor: pointer;
          box-shadow: var(--shadow); opacity: 0; pointer-events: none;
          transform: translateY(10px); transition: opacity .2s, transform .2s; z-index: 50; }
.to-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.to-top:hover { filter: brightness(1.1); }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .features { grid-template-columns: 1fr; }
  .row { grid-template-columns: 1fr; }
  .host-row { grid-template-columns: 1fr; }
  footer { flex-direction: column; text-align: center; }
  .theme-switch { position: static; margin: 0 auto 1rem; }
  header { padding-top: 1rem; }
}