* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}

/* ===============================
   THEME VARIABLES
================================ */
/* Light */
:root {
  --bg: #ffffff;
  --card: #ffffff;
  --text: #000000;
  --border: #8d8c8c;
  --muted: #6b7280;
}

/* Dark */
body.dark {
  --bg: #000000;
  --card: #000000;
  --text: #ffffff;
  --border: #1f2937;
  --muted: #9ca3af;
}

body {
  background: var(--bg);
  color: var(--text);
}

/* ===============================
   NAVBAR
================================ */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 40px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.4px;
}

.navbar a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
}

/* ===============================
   LAYOUT
================================ */
.page-wrapper {
  max-width: 1200px;
  margin: 60px auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

/* ===============================
   CARDS
================================ */
.crypto-card,
.output-card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  background: var(--card);
}

/* ===============================
   TOGGLE BUTTONS
================================ */
.toggle {
  display: flex;
  margin: 20px 0;
}

.toggle button {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}

.toggle .active {
  background: var(--text);
  color: var(--bg);
}

/* ===============================
   FORM
================================ */
.form-group {
  margin-bottom: 16px;
}

label {
  font-weight: 600;
  margin-bottom: 6px;
  display: block;
}

input,
select {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

/* Fix select color issue in dark mode */
select,
option {
  background: #ffffff;
  color: #000000;
}

body.dark select,
body.dark option {
  background: #000000;
  color: #ffffff;
}

/* Secret key row */
.key-row {
  display: flex;
  gap: 8px;
}

/* Hint */
.key-hint {
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}

/* ===============================
   BUTTONS
================================ */
.btn-primary {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--text);
  background: var(--text);
  color: var(--bg);
  cursor: pointer;
  font-weight: 600;
}

/* Generate key button */
.btn-secondary {
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease;
}

.btn-secondary:hover {
  background: var(--text);
  color: var(--bg);
}

.btn-secondary:active {
  transform: scale(0.97);
}

.btn-secondary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ===============================
   OUTPUT
================================ */
.output-box {
  min-height: 200px;
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: 10px;
  white-space: pre-wrap;
}

/* ===============================
   DASHBOARD LINK
================================ */
.dash {
  padding: 8px 18px;
  border-radius: 20px;
  border: 1px solid var(--text);
  text-decoration: none;
  background-color: var(--bg);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 600;
  transition: background 0.2s ease, color 0.2s ease;
}

.dash:hover {
  background-color: var(--text);
  color: var(--bg);
}

body.dark .dash {
  border-color: #ffffff;
}

body.dark .dash:hover {
  background-color: #ffffff;
  color: #000000;
}

/* ===============================
   THEME TOGGLE
================================ */
.theme-toggle {
  padding: 8px 14px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
}

body.dark .theme-toggle {
  background-color: #ffffff;
  color: #000000;
}

/* ===============================
   RESPONSIVE
================================ */
@media (max-width: 900px) {
  .page-wrapper {
    grid-template-columns: 1fr;
  }

  .navbar {
    padding: 16px 24px;
  }
}

@media (max-width: 480px) {
  .btn-secondary {
    padding: 12px;
    font-size: 15px;
  }
}