@import url('https://fonts.googleapis.com/css2?family=Fira+Sans:wght@300;400;500;600&family=Fira+Mono:wght@400;500&display=swap');

:root {
  --bg:         #1A1A1A;
  --bg-card:    #222222;
  --bg-input:   #161616;
  --text:       #F0F0F0;
  --text-muted: #A8A8A8;
  --accent:     #C0392B;
  --accent-h:   #A93226;
  --border:     #363636;
  --border-h:   #4A4A4A;
  --success:    #2E7D32;
  --success-t:  #81C784;
  --warn-t:     #FFB74D;
  --err-t:      #EF9A9A;
  --font:       'Fira Sans', -apple-system, sans-serif;
  --mono:       'Fira Mono', 'Courier New', monospace;
  --radius:     10px;
  --radius-sm:  7px;
}

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

html { font-size: 15px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* ── SCROLLBAR ────────────────────────────────────────────────────────────── */
::-webkit-scrollbar        { width: 5px; height: 5px; }
::-webkit-scrollbar-track  { background: transparent; }
::-webkit-scrollbar-thumb  { background: var(--border-h); border-radius: 3px; }

/* ── LOGO ─────────────────────────────────────────────────────────────────── */
.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.logo-icon {
  height: 32px;
  width: 32px;
  flex-shrink: 0;
}
.logo-text {
  font-family: var(--font);
  font-weight: 500;
  font-size: 1.25rem;
  letter-spacing: 0.22em;
  color: var(--text);
  user-select: none;
}

/* ── HEADER ───────────────────────────────────────────────────────────────── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 32px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.user-area {
  display: flex;
  align-items: center;
  gap: 14px;
}
.username-chip {
  font-size: 0.85rem;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  font-weight: 500;
}
.logout-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color .15s, color .15s;
}
.logout-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ── MAIN ─────────────────────────────────────────────────────────────────── */
main {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 36px 20px 48px;
}

.panel {
  width: 100%;
  max-width: 820px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* ── MODE TOGGLE ──────────────────────────────────────────────────────────── */
.mode-toggle {
  display: flex;
  align-self: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 340px;
  width: 100%;
}
.mode-btn {
  flex: 1;
  padding: 9px 0;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: background .2s, color .2s;
  text-align: center;
}
.mode-btn.active  { background: var(--text); color: #1A1A1A; }
.mode-btn:hover:not(.active) { background: var(--bg-card); color: var(--text); }

/* ── SPINBOXES ────────────────────────────────────────────────────────────── */
.spinboxes-row {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.spinbox-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}
.spinbox-label {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  font-weight: 600;
}
.spinbox {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-card);
}
.spin-btn {
  width: 38px;
  min-height: 44px;
  background: #222;
  border: none;
  color: var(--text);
  font-size: 1.1rem;
  cursor: pointer;
  transition: background .15s;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-bottom: 2px;
  line-height: 1;
  -webkit-tap-highlight-color: transparent;
}
.spin-btn:hover  { background: var(--accent); }
.spin-btn:active { background: var(--accent-h); }
.spin-value {
  width: 50px;
  text-align: center;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  padding: 10px 0;
  user-select: none;
}

/* ── FORM FIELDS ──────────────────────────────────────────────────────────── */
.field-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.field-row {
  display: flex;
  gap: 16px;
}
.field-row .field-group { flex: 1; }

.field-label {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

input[type="text"],
input[type="email"],
input[type="password"] {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
  padding: 10px 13px;
  width: 100%;
  transition: border-color .2s;
}
input:focus { outline: none; border-color: var(--border-h); }
input::placeholder { color: var(--text-muted); }

textarea {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
  padding: 12px 14px;
  resize: vertical;
  min-height: 190px;
  line-height: 1.65;
  width: 100%;
  transition: border-color .2s;
}
textarea:focus   { outline: none; border-color: var(--border-h); }
textarea::placeholder { color: var(--text-muted); }

/* ── ACTION BUTTON ────────────────────────────────────────────────────────── */
.action-btn {
  align-self: center;
  background: var(--text);
  color: #1A1A1A;
  border: 1px solid var(--text);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  padding: 12px 52px;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s;
}
.action-btn:hover    { background: transparent; color: var(--accent); border-color: var(--accent); }
.action-btn:active   { background: var(--accent); color: var(--text); border-color: var(--accent); }
.action-btn:disabled { opacity: .45; cursor: not-allowed; }

/* ── NOTIFICATIONS ────────────────────────────────────────────────────────── */
.notification {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  line-height: 1.4;
  animation: fade-up .25s ease both;
}
.notification.success { background: rgba(46,125,50,.13); border: 1px solid rgba(76,175,80,.3); color: var(--success-t); }
.notification.warning { background: rgba(245,124,0,.1);  border: 1px solid rgba(245,124,0,.3); color: var(--warn-t);    }
.notification.error   { background: rgba(142,0,0,.15);   border: 1px solid rgba(142,0,0,.4);   color: var(--err-t);     }

/* ── RESULT ───────────────────────────────────────────────────────────────── */
.result-area {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-card);
  animation: fade-up .3s ease both;
}
.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
.result-title {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-muted);
}
.copy-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 3px 11px;
  border-radius: 5px;
  cursor: pointer;
  transition: border-color .15s, color .15s;
}
.copy-btn:hover         { border-color: var(--border-h); color: var(--text); }
.copy-btn.copied        { border-color: var(--success); color: var(--success-t); }
.result-body {
  padding: 14px 16px;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text);
  max-height: 260px;
  overflow-y: auto;
}
.result-body.decrypted {
  font-family: var(--font);
  font-size: 0.88rem;
  word-break: normal;
  line-height: 1.7;
}

/* ── FOOTER ───────────────────────────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 18px;
  color: var(--text-muted);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  border-top: 1px solid var(--border);
  cursor: default;
  transition: color .2s;
}
footer:hover { color: var(--accent); }

/* ── LOGIN PAGE ───────────────────────────────────────────────────────────── */
body.login-page {
  height: 100dvh;
  overflow: hidden;
}

.login-wrapper {
  height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  gap: 0;
  overflow: hidden;
}
.login-card {
  width: 100%;
  max-width: 360px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 46px 38px 42px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
}
.login-logo-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.login-logo-icon  { height: 48px; width: 48px; }
.login-logo-text  {
  font-family: var(--font);
  font-weight: 500;
  font-size: 1.4rem;
  letter-spacing: 0.28em;
  color: var(--text);
}
.login-form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.login-btn {
  width: 100%;
  background: var(--text);
  color: #1A1A1A;
  border: 1px solid var(--text);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  padding: 12px;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s;
  margin-top: 6px;
}
.login-btn:hover    { background: transparent; color: var(--accent); border-color: var(--accent); }
.login-btn:disabled { opacity: .5; cursor: not-allowed; }
.login-error {
  font-size: 0.78rem;
  color: var(--err-t);
  text-align: center;
  letter-spacing: 0.04em;
  min-height: 1.2em;
}
.login-footer {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  margin-top: 16px;
}

/* ── ANIMATION ────────────────────────────────────────────────────────────── */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0);   }
}

/* ── RESPONSIVE ───────────────────────────────────────────────────────────── */

/* Prevent iOS zoom on input focus (needs font-size >= 16px) */
@media (max-width: 768px) {
  input[type="text"],
  input[type="email"],
  input[type="password"],
  textarea { font-size: 16px; }

  main { padding: 24px 16px 48px; }

  .action-btn { padding: 13px 40px; }
}

/* Mobile landscape / large phones */
@media (max-width: 600px) {
  header       { padding: 11px 14px; }
  .logo-text   { font-size: 1.1rem; letter-spacing: 0.18em; }
  .logo-icon   { height: 28px; width: 28px; }

  main         { padding: 18px 12px 48px; }
  .panel       { gap: 14px; }

  .mode-toggle { width: 100%; }
  .mode-btn    { flex: 1; padding: 10px 0; text-align: center; }

  .field-row   { flex-direction: column; }

  .action-btn  { width: 100%; padding: 14px; }

  textarea     { min-height: 150px; }

  .result-body { max-height: 220px; font-size: 0.74rem; }
  .result-body.decrypted { font-size: 0.85rem; }

  .login-card  { padding: 36px 24px 32px; }
}

/* Small phones (iPhone SE, 375px) */
@media (max-width: 480px) {
  .username-chip { display: none; }

  /* 2×2 spinbox grid */
  .spinboxes-row {
    display: grid;
    grid-template-columns: repeat(2, auto);
    justify-content: center;
    gap: 14px 28px;
  }

  .spin-value { width: 54px; }
}