/* ─────────────── GLOBAL RESET ─────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Roboto", sans-serif;
  background: #f4fdf4;
  color: #222;
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: #28a745;
}
a:hover {
  text-decoration: underline;
}

/* ─────────────── NAV / HEADER ─────────────── */
.site‑nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #28a745;
  padding: 0.75rem 1.5rem;
  color: #fff;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo img {
  height: 50px;
}

.logo-text {
  line-height: 1.1;
}
.logo-text .slogan {
  font-size: 0.75rem;
  font-style: italic;
}

.nav‑link {
  margin-left: 1rem;
  color: #fff;
  font-weight: bold;
}
.nav‑link:hover {
  text-decoration: underline;
}

#theme-toggle {
  background: none;
  border: none;
  font-size: 1.2rem;
  color: #fff;
  cursor: pointer;
  margin-left: 1rem;
}

/* ─────────────── HOW‑TO STEPS ─────────────── */
.how‑to {
  max-width: 480px;
  margin: 2rem auto;
  padding: 1.5rem 2rem;
  background: #ffffff;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}
.how‑to h2 {
  margin-top: 0;
  color: #1b7e34;
}
.how‑to ol {
  padding-left: 1.3rem;
}
.how‑to li {
  margin-bottom: 1rem;
}
.how‑to code {
  background: #e6f4ea;
  padding: 2px 5px;
  border-radius: 4px;
  font-size: 0.95em;
}

/* ─────────────── FORM CARD ─────────────── */
.resign-card {
  max-width: 480px;
  margin: 2rem auto;
  padding: 2rem;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.06);
}

.resign-card h2 {
  color: #28a745;
  margin-bottom: 1.5rem;
  text-align: center;
}

.resign-card label {
  display: block;
  margin-top: 1rem;
  font-weight: 500;
}

.resign-card input {
  width: 100%;
  padding: 0.8rem 1rem;
  margin-top: 0.4rem;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-size: 1rem;
}

.resign-card button {
  width: 100%;
  margin-top: 1.4rem;
  padding: 0.9rem;
  background: #28a745;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.25s;
}

.resign-card button:hover {
  background: #1e8b36;
}

#doneMsg {
  margin-top: 1rem;
  text-align: center;
  font-weight: bold;
}

/* ─────────────── LETTER TEMPLATE ─────────────── */
.letter {
  font-family: "Times New Roman", serif;
  font-size: 12pt;
  line-height: 1.6;
  margin: 2cm;
  color: #000;
}

/* ─────────────── FOOTER ─────────────── */
footer {
  background: #000;
  color: #fff;
  text-align: center;
  padding: 1rem 0;
  margin-top: 4rem;
}

.social-links {
  margin-top: 0.6rem;
}
.social-links a {
  color: #28a745;
  margin: 0 0.5rem;
  font-size: 1.3rem;
  transition: color 0.25s;
}
.social-links a:hover {
  color: #90EE90;
}

/* ─────────────── DARK MODE ─────────────── */
body.dark-mode {
  background: #121212;
  color: #ddd;
}

body.dark-mode .site‑nav {
  background: #1b1b1b;
}
body.dark-mode .nav‑link {
  color: #90EE90;
}
body.dark-mode .resign-card,
body.dark-mode .how‑to {
  background: #1e1e1e;
  color: #e0e0e0;
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.06);
}
body.dark-mode input,
body.dark-mode button {
  background-color: #2c2c2c;
  color: #fff;
  border: 1px solid #444;
}
body.dark-mode .resign-card button:hover {
  background-color: #2e7d32;
}
body.dark-mode .letter {
  color: #fff;
}

/* ─────────────── RESPONSIVE ─────────────── */
@media (max-width: 768px) {
  .site‑nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .resign-card {
    margin: 1.5rem 1rem;
  }
  .how‑to {
    margin: 1.5rem 1rem;
    padding: 1rem;
  }
}