/*
 * Copia Segura
 * Copyright (C) 2026 Fabio Britez
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

/*
 * base.css - Shared foundations: theme system, reset, body typography,
 * light/dark toggle, footer and accessibility.
 *
 * Loaded by both the tool (index.html) and the long-form pages, so the theme
 * and the visual identity stay one system instead of two that drift apart.
 *
 * No framework, no remote fonts (Decision 7). Mobile-first: most people edit
 * the photo of their ID on a phone.
 */

/* ---------- themes ----------
 *
 * Light by default; dark when the system asks for it unless the user chose
 * light, and always dark when the user chose dark. Written this way so the
 * site still looks right with JavaScript disabled: then only the media query
 * applies.
 *
 * Colours come in two families because one blue cannot do both jobs: the one
 * used as a BACKGROUND under white text must be dark, while the one used as
 * TEXT over the page background has to flip between themes to keep contrast.
 */

:root {
  /* solid colours: they carry white text on top */
  --blue: #1d4ed8;
  --blue-light: #3b82f6;
  --red: #dc2626;
  --green: #15803d;
  --violet: #7c3aed;

  /* the same colours, but for use as text over the background */
  --blue-text: #1d4ed8;
  --red-text: #b91c1c;
  --green-text: #15803d;

  /* surfaces and typography */
  --text: #1f2937;
  --text-muted: #5b6675;
  --border: #e2e8f0;
  --bg: #f4f7fb;
  --panel: #ffffff;
  --panel-subtle: #f8fafc;

  --radius: 12px;
  --shadow: 0 4px 16px rgba(15, 23, 42, 0.07);
  --shadow-lg: 0 10px 30px rgba(15, 23, 42, 0.12);
}

/* Dark by system preference... */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --blue: #2563eb;
    --blue-light: #3b82f6;
    --blue-text: #7cb0ff;
    --red-text: #fca5a5;
    --green-text: #6ee7a8;
    --violet: #a78bfa;

    --text: #e6edf6;
    --text-muted: #9aa8bd;
    --border: #2c3a4f;
    --bg: #0d1626;
    --panel: #16213a;
    --panel-subtle: #1b2942;

    --shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
  }
}

/* ...or by an explicit choice of the user. */
:root[data-theme="dark"] {
  --blue: #2563eb;
  --blue-light: #3b82f6;
  --blue-text: #7cb0ff;
  --red-text: #fca5a5;
  --green-text: #6ee7a8;
  --violet: #a78bfa;

  --text: #e6edf6;
  --text-muted: #9aa8bd;
  --border: #2c3a4f;
  --bg: #0d1626;
  --panel: #16213a;
  --panel-subtle: #1b2942;

  --shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
}

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

/*
 * `hidden` means display:none, but only from the browser stylesheet: any
 * `display` declared here overrides it. Several classes use display:flex, so
 * their hidden elements kept being painted (the notice as an empty red bar,
 * the canvas panel as a blank box). This rule makes `hidden` always win.
 */
[hidden] {
  display: none !important;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 1rem;
}

/* Skip link: invisible until keyboard navigation reaches it. */
.skip-link {
  position: absolute;
  left: -9999px;
  background: var(--blue);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 0 0 var(--radius) 0;
  z-index: 20;
}

.skip-link:focus {
  left: 0;
  top: 0;
}

/* ---------- footer ---------- */

.footer {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 1.25rem 0 0.5rem;
  display: flex;
  justify-content: center;
  gap: 0.6rem;
}

.footer a {
  color: var(--text-muted);
}

.footer a:hover {
  color: var(--blue-text);
}


/* ---------- accessibility and touch ---------- */

/* Focus always visible for keyboard navigation. */
:focus-visible {
  outline: 3px solid var(--blue-light);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Comfortable touch targets: 44 px is the recommended minimum. */
@media (pointer: coarse) {
  button {
    min-height: 44px;
  }

  .button-row.main button {
    flex: 1 1 auto;
  }

  input[type="radio"],
  input[type="checkbox"] {
    width: 1.15rem;
    height: 1.15rem;
  }
}


/* ---------- theme toggle ----------
 *
 * Deliberately discreet: it is a preference, not a product feature. It sits
 * in the corner in muted text colour and only takes colour on hover, so it
 * does not compete with the five-step flow.
 */

.header {
  position: relative;
}

.theme-toggle {
  position: absolute;
  top: 0;
  right: 0;
  display: grid;
  place-items: center;
  width: 2.4rem;
  height: 2.4rem;
  padding: 0;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.theme-toggle:hover {
  color: var(--blue-text);
  border-color: var(--blue-light);
  background: var(--panel);
}

.theme-toggle svg {
  width: 1.15rem;
  height: 1.15rem;
}

/* Shows the icon of what tapping gives you, not the current state: that is
   what people expect from a switch. */
.to-light {
  display: none;
}

:root[data-theme="dark"] .to-light {
  display: block;
}

:root[data-theme="dark"] .to-dark {
  display: none;
}

@media (max-width: 420px) {
  .theme-toggle {
    width: 2.1rem;
    height: 2.1rem;
  }
}