/**
 * simulation.css
 * ─────────────────────────────────────────────────────────────
 * PURPOSE: Styles for the "Candidate Simulation Engine" —
 *          the signature interactive feature of the portfolio.
 *          Visitors select requirements and run a simulation
 *          that always recommends Padmaja.
 *
 * LOGIC: A two-panel layout — left has skill selector chips,
 *        right shows the animated simulation output.
 *        The processing animation uses pseudo-CSS and keyframes.
 *        Result panel slides in after JS sets .show class.
 *
 * CUSTOMIZATION: Change skill chips in index.html.
 *                Adjust score range in simulation.js.
 * ─────────────────────────────────────────────────────────────
 */

#simulation {
  background: var(--color-bg);
  overflow: hidden;
}

/* Big decorative background text */
.simulation__bg-text {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 200px;
  font-weight: var(--weight-black);
  color: rgba(139, 92, 246, 0.03);
  user-select: none;
  pointer-events: none;
  white-space: nowrap;
  right: -20px;
  bottom: 0;
  line-height: 1;
}

/* ── SIMULATION LAYOUT ─────────────────────────────────────── */
.simulation__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
}

/* ── LEFT — REQUIREMENTS SELECTOR ─────────────────────────── */
.simulation__panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-7);
}

.simulation__panel-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.simulation__panel-title svg {
  opacity: 0.7;
}

/* Instruction */
.simulation__hint {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
  line-height: 1.6;
}

/* Skill selector chips */
.simulation__chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.sim-chip {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-border);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  background: transparent;
  user-select: none;
}

.sim-chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(139, 92, 246, 0.06);
}

.sim-chip.selected {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(139, 92, 246, 0.12);
  font-weight: var(--weight-semibold);
  box-shadow: 0 0 12px rgba(139, 92, 246, 0.2);
}

.sim-chip__icon {
  font-size: 16px;
}

.sim-chip.selected .sim-chip__check {
  display: inline;
  color: var(--color-success);
}
.sim-chip .sim-chip__check { display: none; }

/* Run button */
.simulation__run-btn {
  width: 100%;
  padding: var(--space-4);
  font-size: var(--text-base);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}

.simulation__run-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(255,255,255,0.1) 50%,
    transparent 100%
  );
  transform: translateX(-100%);
  animation: shimmer 2s ease-in-out infinite;
}

/* Selection counter */
.simulation__counter {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: center;
  margin-top: var(--space-3);
}

.simulation__counter span {
  color: var(--color-primary);
  font-weight: var(--weight-bold);
}

/* ── RIGHT — SIMULATION OUTPUT ─────────────────────────────── */
.simulation__output {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-7);
  min-height: 480px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

/* Default idle state */
.simulation__idle {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  text-align: center;
}

.simulation__idle-icon {
  font-size: 56px;
  animation: float 4s ease-in-out infinite;
  opacity: 0.4;
}

.simulation__idle-text {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  line-height: 1.6;
}

/* Processing state */
.simulation__processing {
  display: none;
  flex: 1;
  flex-direction: column;
  gap: var(--space-3);
  justify-content: center;
}

.simulation__processing.active {
  display: flex;
}

.process-step {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  background: rgba(139, 92, 246, 0.04);
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  opacity: 0;
  transform: translateX(-8px);
  transition: all 0.4s ease;
}

.process-step.running {
  opacity: 1;
  transform: translateX(0);
  border-color: rgba(139, 92, 246, 0.2);
  color: var(--color-text);
}

.process-step.done {
  opacity: 1;
  transform: translateX(0);
  color: var(--color-success);
}

.process-step__icon {
  font-size: 14px;
  animation: spin 1s linear infinite;
  color: var(--color-primary);
}

.process-step.done .process-step__icon {
  animation: none;
  color: var(--color-success);
}

/* Result card */
.simulation__result {
  display: none;
  flex-direction: column;
  gap: var(--space-5);
}

.simulation__result.show {
  display: flex;
  animation: fadeInUp 0.6s var(--transition-spring) both;
}

/* Score ring */
.result__score-ring {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  position: relative;
}

.result__ring-svg {
  transform: rotate(-90deg);
}

.result__ring-bg {
  fill: none;
  stroke: rgba(139, 92, 246, 0.15);
  stroke-width: 8;
}

.result__ring-fill {
  fill: none;
  stroke: url(#ringGradient);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 283; /* 2πr where r=45 */
  stroke-dashoffset: 283;
  transition: stroke-dashoffset 1.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.result__ring-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  pointer-events: none;
}

.result__score-number {
  font-size: var(--text-3xl);
  font-weight: var(--weight-black);
  color: var(--color-primary);
  line-height: 1;
  letter-spacing: -0.03em;
}

.result__score-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Candidate recommendation block */
.result__candidate {
  background: rgba(139, 92, 246, 0.06);
  border: 1px solid rgba(139, 92, 246, 0.25);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  text-align: center;
}

.result__label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-2);
}

.result__name {
  font-size: var(--text-2xl);
  font-weight: var(--weight-black);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-1);
}

.result__title {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* Matched skills list */
.result__matched-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}

.result__skill-match {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--color-success);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
}