/* ==========================================================================
   ENGINEERING STUDENT SCIENTIFIC CALCI 991 (V.P.A.M. PRECISION)
   Modeled after the standard non-programmable Indian college examination calculator
   ========================================================================== */

.casio-chassis-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 1.25rem;
  width: 100%;
}

.calci-suite-wrapper {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 2rem;
  align-items: start;
  width: 100%;
  max-width: 1000px;
}

@media (max-width: 960px) {
  .calci-suite-wrapper {
    grid-template-columns: 1fr;
    justify-items: center;
  }
}

/* AI & Prompt Companion Panel */
.calci-ai-companion {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  width: 100%;
}

.ai-companion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.85rem;
}

.ai-companion-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
}

.ai-companion-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.view-all-formulas-link {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-primary);
  text-decoration: none;
  background: var(--accent-light);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent-border);
  transition: all 0.15s ease;
}

.view-all-formulas-link:hover {
  background: var(--accent-primary);
  color: #ffffff;
}

.ai-input-bar-wrap {
  display: flex;
  gap: 0.5rem;
}

.calci-ai-input {
  flex: 1;
  padding: 0.65rem 0.9rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.15s ease;
}

.calci-ai-input:focus {
  border-color: var(--accent-primary);
  background: var(--bg-surface);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.calci-ai-btn {
  background: var(--accent-primary);
  color: #ffffff;
  border: none;
  padding: 0 1.25rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.15s ease;
}

.calci-ai-btn:hover {
  background: var(--accent-hover);
}

.ai-chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.ai-prompt-chip {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.12s ease;
}

.ai-prompt-chip:hover {
  background: var(--accent-light);
  color: var(--accent-primary);
  border-color: var(--accent-border);
}

/* AI Solution Card */
.ai-solution-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--emerald-primary);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.ai-card-step-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ai-card-tag {
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--emerald-primary);
}

.ai-card-status {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.ai-card-result {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
}

.ai-card-explanation {
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

.casio-chassis {
  width: 100%;
  max-width: 350px;
  background: linear-gradient(175deg, #2b303c 0%, #1e222b 50%, #171a21 100%);
  border-radius: 18px 18px 24px 24px;
  padding: 0.9rem;
  box-shadow: 
    0 15px 30px -8px rgba(0, 0, 0, 0.5),
    0 0 0 2px #3e4453,
    inset 0 2px 3px rgba(255, 255, 255, 0.15),
    inset 0 -3px 5px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  user-select: none;
  border: 1px solid #14171d;
}

/* Calci Header Branding & Solar Cell */
.casio-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 0.2rem;
}

.casio-brand {
  display: flex;
  flex-direction: column;
}

.casio-logo {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  color: #e2e8f0;
  line-height: 1;
}

.casio-model {
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 700;
  color: #94a3b8;
  letter-spacing: 0.05em;
  margin-top: 1px;
}

.casio-svpam {
  font-size: 0.52rem;
  font-weight: 800;
  color: #60a5fa;
  letter-spacing: 0.08em;
}

.casio-solar-panel {
  width: 68px;
  height: 18px;
  background: linear-gradient(180deg, #3d2217 0%, #2a140b 100%);
  border-radius: 3px;
  border: 1px solid #1a0b05;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.8);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  padding: 2px;
}

.casio-solar-cell {
  background: #4a2d1f;
  border-radius: 1px;
}

/* 2-Line LCD Screen */
.casio-screen-bezel {
  background: #11141a;
  padding: 6px;
  border-radius: 7px;
  box-shadow: inset 0 3px 6px rgba(0, 0, 0, 0.8), 0 1px 0 rgba(255, 255, 255, 0.08);
}

.casio-lcd {
  background-color: #8c9e84; /* Authentic greenish retro LCD hue */
  color: #1a2217;
  border-radius: 4px;
  padding: 5px 8px;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-direction: column;
  min-height: 60px;
  justify-content: space-between;
  font-family: var(--font-mono);
  position: relative;
  overflow: hidden;
}

/* Status Flag Indicators */
.casio-status-bar {
  display: flex;
  gap: 6px;
  font-size: 0.52rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: rgba(26, 34, 23, 0.25);
  border-bottom: 1px solid rgba(26, 34, 23, 0.15);
  padding-bottom: 1px;
}

.casio-flag.active {
  color: #1a2217;
  text-shadow: 0 0 1px rgba(0, 0, 0, 0.4);
}

/* Upper Line: Dot Matrix Expression */
.casio-expr-line {
  font-size: 0.88rem;
  min-height: 1.25rem;
  white-space: nowrap;
  overflow-x: auto;
  letter-spacing: 0.04em;
  font-weight: 600;
  display: flex;
  align-items: center;
  scrollbar-width: none;
}
.casio-expr-line::-webkit-scrollbar { display: none; }

.casio-cursor {
  display: inline-block;
  width: 2px;
  height: 1.1rem;
  background-color: #1a2217;
  animation: casio-blink 1s infinite;
  margin-left: 1px;
}

@keyframes casio-blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

/* Lower Line: 10+2 Mantissa & Exponent */
.casio-result-line {
  font-size: 1.35rem;
  font-weight: 700;
  text-align: right;
  letter-spacing: 0.06em;
  line-height: 1.2;
}

/* Keypad Section */
.casio-keypad {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

/* Top Function Row (SHIFT, ALPHA, REPLAY D-PAD, MODE, ON) */
.casio-top-controls {
  display: grid;
  grid-template-columns: 1fr 1fr 1.5fr 1fr 1fr;
  gap: 6px;
  align-items: center;
}

/* Replay 4-Way D-Pad */
.casio-dpad {
  width: 72px;
  height: 72px;
  background: radial-gradient(circle, #e2e8f0 0%, #94a3b8 70%, #64748b 100%);
  border-radius: 50%;
  box-shadow: 
    0 4px 8px rgba(0, 0, 0, 0.4),
    inset 0 2px 3px rgba(255, 255, 255, 0.8),
    inset 0 -2px 3px rgba(0, 0, 0, 0.4);
  position: relative;
  margin: 0 auto;
  border: 1px solid #475569;
}

.casio-dpad-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 32px;
  height: 32px;
  background: #475569;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.5rem;
  font-weight: 800;
  color: #cbd5e1;
  pointer-events: none;
  letter-spacing: -0.05em;
}

.dpad-btn {
  position: absolute;
  background: transparent;
  border: none;
  cursor: pointer;
  color: #1e293b;
  font-size: 0.75rem;
  display: grid;
  place-items: center;
  transition: transform 0.05s ease;
}
.dpad-btn:active { transform: scale(0.9); }
.dpad-up { top: 3px; left: 50%; transform: translateX(-50%); width: 26px; height: 18px; }
.dpad-down { bottom: 3px; left: 50%; transform: translateX(-50%); width: 26px; height: 18px; }
.dpad-left { left: 3px; top: 50%; transform: translateY(-50%); width: 18px; height: 26px; }
.dpad-right { right: 3px; top: 50%; transform: translateY(-50%); width: 18px; height: 26px; }

/* Casio Key Rows */
.casio-key-row {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 5px;
}

.casio-key-row-5 {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 5px;
}

/* Individual Key Button with Dual Legends */
.casio-btn-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

/* Upper legends */
.casio-legends {
  display: flex;
  justify-content: space-between;
  width: 100%;
  padding: 0 2px;
  font-size: 0.52rem;
  font-weight: 800;
  margin-bottom: 2px;
  line-height: 1;
}

.legend-shift { color: #facc15; } /* Yellow */
.legend-alpha { color: #f87171; } /* Red */

/* The Key Button */
.casio-key {
  width: 100%;
  height: 28px;
  background: linear-gradient(180deg, #374151 0%, #1f2937 100%);
  color: #f8fafc;
  border: 1px solid #111827;
  border-radius: 4px;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 
    0 3px 0 #111827,
    0 4px 4px rgba(0, 0, 0, 0.3),
    inset 0 1px 1px rgba(255, 255, 255, 0.2);
  display: grid;
  place-items: center;
  transition: all 0.08s var(--ease-spring);
  user-select: none;
}

.casio-key:hover {
  filter: brightness(1.18);
}

.casio-key:active {
  transform: translateY(2px);
  box-shadow: 
    0 1px 0 #111827,
    0 2px 2px rgba(0, 0, 0, 0.4),
    inset 0 1px 1px rgba(0, 0, 0, 0.3);
}

/* Special Casio Keys */
.key-shift {
  background: linear-gradient(180deg, #ca8a04 0%, #a16207 100%);
  color: #fef08a;
}
.key-alpha {
  background: linear-gradient(180deg, #dc2626 0%, #991b1b 100%);
  color: #fecaca;
}
.key-del {
  background: linear-gradient(180deg, #ea580c 0%, #c2410c 100%);
  color: #ffedd5;
}
.key-ac {
  background: linear-gradient(180deg, #ea580c 0%, #c2410c 100%);
  color: #ffedd5;
}
.key-num {
  background: linear-gradient(180deg, #4b5563 0%, #374151 100%);
  font-size: 0.9rem;
}
.key-equal {
  background: linear-gradient(180deg, #2563eb 0%, #1d4ed8 100%);
  color: #ffffff;
}