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

:root {
  --bg: linear-gradient(135deg, rgba(255,255,255,0.96) 0%, rgba(248,251,255,0.96) 42%, rgba(241,246,252,0.96) 100%), linear-gradient(70deg, rgba(125,211,252,0.22), transparent 38%, rgba(244,114,182,0.12) 100%);
  --text: #2a2520;
  --muted: #6a6560;
  --pin-dot-border: #b0a898;
  --pin-dot-filled: #2a2520;
  --pin-dot-error: #c0392b;
  --btn-bg: rgba(255,255,255,0.9);
  --btn-border: rgba(42,37,32,0.12);
  --btn-hover-bg: rgba(255,255,255,0.96);
  --btn-hover-border: var(--accent-border);
  --btn-active-bg: rgba(255,255,255,0.78);
  --card-bg: rgba(255,255,255,0.76);
  --card-border: rgba(42,37,32,0.12);
  --card-hover-bg: rgba(255,255,255,0.88);
  --card-hover-border: var(--accent-border);
  --error-color: #c0392b;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --accent-soft: rgba(37,99,235,0.12);
  --accent-hover: rgba(37,99,235,0.1);
  --accent-border: rgba(37,99,235,0.35);
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  --accent-text: #ffffff;
}

[data-theme="dark"] {
  --bg: radial-gradient(1200px 700px at 82% -8%, rgba(96,165,250,0.12), transparent 60%), radial-gradient(900px 600px at -6% 8%, rgba(168,85,247,0.10), transparent 55%), linear-gradient(165deg, #08090d 0%, #0c0e14 52%, #0a0b10 100%);
  --text: #e0dcd4;
  --muted: #7a7570;
  --pin-dot-border: #5a5550;
  --pin-dot-filled: #e0dcd4;
  --pin-dot-error: #e74c3c;
  --btn-bg: rgba(255,255,255,0.06);
  --btn-border: rgba(255,255,255,0.1);
  --btn-hover-bg: rgba(255,255,255,0.1);
  --btn-hover-border: var(--accent-border);
  --btn-active-bg: rgba(255,255,255,0.14);
  --card-bg: rgba(255,255,255,0.04);
  --card-border: rgba(255,255,255,0.08);
  --card-hover-bg: rgba(255,255,255,0.08);
  --card-hover-border: var(--accent-border);
  --error-color: #e74c3c;
  --accent: #60a5fa;
  --accent-strong: #3b82f6;
  --accent-soft: rgba(96,165,250,0.18);
  --accent-hover: rgba(96,165,250,0.16);
  --accent-border: rgba(96,165,250,0.42);
  --accent-gradient: linear-gradient(135deg, #7dd3fc 0%, #3b82f6 100%);
  --accent-text: #08111f;
}

body {
  min-height: 100vh;
  background: var(--bg);
  background-attachment: fixed;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  transition: background 0.3s ease, color 0.3s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Consistent keyboard-focus ring across all interactive controls */
.admin-btn:focus-visible,
.logout-btn:focus-visible,
.theme-toggle:focus-visible,
.theme-color-toggle:focus-visible,
.theme-color-menu button:focus-visible,
.pin-btn:focus-visible,
.card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
/* Only suppress the default outline where we provide our own focus-visible ring */
.card:focus:not(:focus-visible) { outline: none; }

/* Admin button (top-left corner) */
.admin-btn {
  position: fixed;
  top: 16px;
  left: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s;
  color: var(--muted);
  text-decoration: none;
}
.admin-btn:hover {
  background: var(--btn-hover-bg);
  border-color: var(--btn-hover-border);
  color: var(--text);
}

/* Theme toggle (top-right corner) */
.page-controls {
  position: fixed;
  top: 16px;
  right: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logout-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  cursor: pointer;
  font-size: 15px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s;
  color: var(--muted);
}
.logout-btn:hover {
  background: var(--btn-hover-bg);
  border-color: var(--btn-hover-border);
  color: var(--text);
}

.theme-toggle {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s;
}
.theme-toggle:hover {
  background: var(--btn-hover-bg);
  border-color: var(--btn-hover-border);
}

.theme-color-picker {
  position: relative;
}

.theme-color-toggle {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s;
}
.theme-color-toggle::before {
  content: "";
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--swatch-color, var(--accent));
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.theme-color-toggle:hover {
  background: var(--btn-hover-bg);
  border-color: var(--btn-hover-border);
}

.theme-color-menu {
  position: absolute;
  top: 40px;
  right: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: repeat(6, 24px);
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--btn-border);
  border-radius: 10px;
  background: var(--btn-bg);
  background: color-mix(in srgb, var(--btn-bg) 88%, transparent);
  box-shadow: 0 18px 48px rgba(0,0,0,0.18), 0 0 0 1px rgba(255,255,255,0.32) inset;
  backdrop-filter: blur(18px) saturate(1.15);
}
.theme-color-menu[hidden] {
  display: none;
}
.theme-color-menu button {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--btn-border);
  background: var(--swatch-color);
  cursor: pointer;
}
.theme-color-menu-label {
  grid-column: 1 / -1;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.theme-color-menu-separator {
  grid-column: 1 / -1;
  height: 1px;
  background: var(--btn-border);
  margin-top: 2px;
}
.theme-color-menu button.theme-background-swatch {
  border-radius: 8px;
}
.theme-color-menu button.active {
  border-color: var(--text);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* PIN SCREEN */
#pin-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

#pin-screen h2 {
  font-size: 15px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.05em;
}

.pin-dots {
  display: flex;
  gap: 14px;
}

.pin-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1.5px solid var(--pin-dot-border);
  background: transparent;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.pin-dot.filled {
  background: var(--pin-dot-filled);
  border-color: var(--pin-dot-filled);
}

.pin-dot.error {
  background: var(--pin-dot-error);
  border-color: var(--pin-dot-error);
}

.pin-pad {
  display: grid;
  grid-template-columns: repeat(3, 72px);
  grid-template-rows: repeat(4, 72px);
  gap: 10px;
}

.pin-btn {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  font-size: 22px;
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s ease, box-shadow 0.1s ease, border-color 0.1s;
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
  backdrop-filter: blur(12px);
  user-select: none;
}

.pin-btn:hover {
  background: var(--btn-hover-bg);
  border-color: var(--btn-hover-border);
  box-shadow: 0 4px 12px rgba(0,0,0,0.10);
}

.pin-btn:active {
  background: var(--btn-active-bg);
  box-shadow: none;
}

.pin-btn.empty {
  background: transparent;
  border: none;
  box-shadow: none;
  cursor: default;
  pointer-events: none;
}

.pin-btn.delete {
  font-size: 18px;
}

.pin-error-msg {
  font-size: 13px;
  color: var(--error-color);
  min-height: 18px;
  letter-spacing: 0.02em;
}

/* MAIN SCREEN */
#main-screen {
  display: none;
  flex-direction: column;
  gap: 16px;
}

.cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card {
  width: 260px;
  height: 120px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  max-width: 100%;
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.25s ease, transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  backdrop-filter: blur(14px) saturate(1.08);
  user-select: none;
}

.card:hover {
  background: var(--card-hover-bg);
  border-color: var(--card-hover-border);
  box-shadow: 0 18px 46px rgba(15, 23, 42, 0.14), 0 0 0 3px var(--accent-soft);
  transform: translateY(-2px);
}

.card:active {
  transform: translateY(0);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.10), 0 0 0 3px var(--accent-soft);
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-8px); }
  40%       { transform: translateX(8px); }
  60%       { transform: translateX(-6px); }
  80%       { transform: translateX(6px); }
}

.shake { animation: shake 0.35s ease; }

/* Small phones: keep the PIN pad and cards comfortably inside the viewport */
@media (max-width: 360px) {
  .pin-pad {
    grid-template-columns: repeat(3, 64px);
    grid-template-rows: repeat(4, 64px);
  }
  .pin-btn { width: 64px; height: 64px; font-size: 20px; }
}

/* Respect users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .card:hover, .card:active { transform: none; }
}