/* --- 1. DESIGN TOKENS --- */
:root {
  --color-bg: #f8fafc; /* off-white */
  --color-surface: #e2e8f0; /* slate-200 */
  --color-surface-soft: #edf2ff; /* indigo-50 */
  --color-surface-strong: #0f172a; /* slate-900 for keys */
  --color-border: #94a3b8; /* slate-400 */

  --color-text: #0f172a; /* slate-900 */
  --color-muted: #475569; /* slate-600 */
  --color-accent: #0ea5e9; /* sky-500 */
  --color-accent-strong: #0284c7; /* sky-600 */
  --color-accent-soft: #e0f2fe; /* sky-100 */
  --color-danger: #ef4444; /* red-500 */

  --shadow-soft:
    0 1px 2px rgba(15, 23, 42, 0.08), 0 8px 16px rgba(15, 23, 42, 0.08);

  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 999px;

  --font-family-base:
    "Space Grotesk", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;

  --line-height-base: 1.5;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  --transition-fast: 150ms ease-out;
  --transition-med: 200ms ease-out;
}

/* --- 2. GLOBAL RESET & LAYOUT --- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px; /* Accessibility base size */
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-family-base);
  font-size: var(--text-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: var(--space-8) var(--space-4);
}

.app-header,
.app-main,
.app-footer {
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
}

/* --- 3. HEADER --- */
.app-header {
  margin-bottom: var(--space-8);
}

.app-title {
  font-size: 1.875rem;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-2);
  color: var(--color-surface-strong);
}

.app-subtitle {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-muted);
  max-width: 38rem;
}

/* --- 4. DISPLAY AREA --- */
.display-section {
  margin-bottom: var(--space-8);
}

.display-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-soft);
}

.display-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: var(--space-2);
}

.display-textarea {
  width: 100%;
  /* eslint-disable-next-line css/use-baseline */
  resize: none;
  overflow: hidden;
  min-height: 120px;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  font-family: var(--font-family-base);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: #f9fafb;
  outline: none;
  box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.08);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

.display-textarea:focus-visible {
  border-color: var(--color-accent-strong);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.35);
  background-color: #ffffff;
}

/* --- 5. KEYBOARD LAYOUT --- */
.keyboard-section {
  margin-bottom: var(--space-8);
}

.keyboard {
  background: linear-gradient(145deg, var(--color-surface-soft), #e5e7eb);
  border-radius: 24px;
  padding: var(--space-5);
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.22);
  border: 1px solid rgba(148, 163, 184, 0.6);
  display: grid;
  gap: var(--space-2);
}

.keyboard-row {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  gap: var(--space-2);
}

/* Row-specific layouts for realistic proportions */
.keyboard-row--1 {
  grid-template-columns: minmax(0, 1.2fr) repeat(12, minmax(0, 1fr)) minmax(
      0,
      2.4fr
    );
}

.keyboard-row--2 {
  grid-template-columns: minmax(0, 1.8fr) repeat(12, minmax(0, 1fr));
}

.keyboard-row--3 {
  grid-template-columns: minmax(0, 2.4fr) repeat(11, minmax(0, 1fr)) minmax(
      0,
      2.4fr
    );
}

.keyboard-row--4 {
  grid-template-columns: minmax(0, 2.4fr) repeat(10, minmax(0, 1fr)) minmax(
      0,
      2.4fr
    );
}

.keyboard-row--5 {
  grid-template-columns:
    minmax(0, 1.6fr) minmax(0, 1.6fr) minmax(0, 6fr) minmax(0, 1.6fr)
    minmax(0, 1.6fr);
}

/* --- 6. KEY STYLES --- */
.key {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 0.4rem;
  border-radius: 10px;
  border: 1px solid rgba(15, 23, 42, 0.8);
  background: radial-gradient(circle at 20% 0%, #1e293b, #020617);
  color: #f9fafb;
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;

  /* eslint-disable css/use-baseline */
  -webkit-user-select: none;
  user-select: none;
  box-shadow: 0 3px 0 rgba(15, 23, 42, 0.9);
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
}

.key--special {
  background: radial-gradient(circle at 10% 0%, #0f172a, #020617);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.key--utility {
  color: #e5e7eb;
}

.key--control {
  color: #e5e7eb;
}

.key--space {
  grid-column: 3 / span 1;
  padding-inline: 3rem;
  justify-content: center;
}

/* Caps, Enter, Backspace shape emphasis */
.key--backspace,
.key--enter {
  font-size: var(--text-xs);
}

.key--caps,
.key--enter,
.key--shift,
.key--space {
  background: radial-gradient(circle at 20% 0%, #0b1120, #020617);
}

/* Pressed / active state */
.key:active,
.key.is-active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 rgba(15, 23, 42, 0.9);
  background: radial-gradient(circle at 20% 0%, #1d4ed8, #020617);
  border-color: #1d4ed8;
}

/* Hover focus states with accessible outlines */
.key:hover {
  border-color: var(--color-accent);
}

.key:focus-visible {
  outline: none;
  box-shadow:
    0 0 0 3px rgba(14, 165, 233, 0.5),
    0 3px 0 rgba(15, 23, 42, 0.9);
}

/* Caps lock indicator */
.key--caps {
  justify-content: space-between;
  padding-inline: var(--space-3);
}

.key-indicator {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  border: 1px solid #e5e7eb;
  background-color: transparent;
  box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.6);
  transition:
    background-color var(--transition-med),
    box-shadow var(--transition-med);
}

.key--caps[aria-pressed="true"] .key-indicator {
  background-color: #22c55e;
  box-shadow: 0 0 12px rgba(34, 197, 94, 0.8);
}

.key--caps[aria-pressed="true"] {
  border-color: #22c55e;
  background: radial-gradient(circle at 20% 0%, #16a34a, #022c22);
}

/* --- 7. FOOTER --- */
.app-footer {
  margin-top: auto;
  padding-top: var(--space-6);
}

.app-footer__text {
  font-size: var(--text-xs);
  color: var(--color-muted);
  text-align: right;
}

/* --- 8. UTILITY ATMOSPHERE --- */
.gradient-mesh {
  position: relative;
  isolation: isolate;
  background:
    radial-gradient(at 40% 20%, rgba(248, 250, 252, 0.9) 0px, transparent 50%),
    radial-gradient(at 90% 10%, rgba(125, 211, 252, 0.6) 0px, transparent 55%),
    radial-gradient(at 0% 100%, rgba(199, 210, 254, 0.6) 0px, transparent 55%),
    radial-gradient(at 100% 100%, rgba(52, 211, 153, 0.4) 0px, transparent 55%);
}

/* --- 9. RESPONSIVE --- */
@media (max-width: 768px) {
  .app {
    padding: var(--space-6) var(--space-3);
  }

  .keyboard {
    padding: var(--space-4);
  }

  .keyboard-row {
    gap: var(--space-1);
  }

  .key {
    padding: 0.5rem 0.2rem;
    border-radius: 8px;
    font-size: 0.8rem;
    /* Added to ensure icons don't wrap or look weird */
    white-space: nowrap;
    overflow: hidden;
  }

  .keyboard-row--1,
  .keyboard-row--2,
  .keyboard-row--3,
  .keyboard-row--4,
  .keyboard-row--5 {
    grid-template-columns: repeat(auto-fit, minmax(28px, 1fr));
  }

  .key--space {
    grid-column: span 6;
  }

  /* --- UPDATED SPECIAL KEY LOGIC --- */
  .key--special {
    font-size: 0; /* Hides the text: "Backspace", "Shift", etc. */
    letter-spacing: 0;
    padding-inline: var(--space-1);
  }

  /* --- ADDED ICON PSEUDO-ELEMENTS --- */
  .key--backspace::before {
    content: "⌫";
    font-size: 1.1rem;
  }
  .key--enter::before {
    content: "↵";
    font-size: 1.2rem;
  }
  .key--shift::before {
    content: "⇧";
    font-size: 1.2rem;
  }
  .key--tab::before {
    content: "⇥";
    font-size: 1.2rem;
  }
  .key--caps::before {
    content: "⇪";
    font-size: 1.2rem;
  }

  /* Ensure the caps indicator dot still shows up next to the icon */
  .key--caps {
    display: flex;
    gap: var(--space-1);
    justify-content: center;
  }
}

@media (min-width: 1024px) {
  .app {
    padding-top: var(--space-10);
  }

  .keyboard {
    padding: var(--space-6);
  }

  .key {
    padding: 0.65rem 0.5rem;
  }
}