/* ================================================
   exam.css — Final exam styles
   ================================================ */

.ex-ambient {
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse 50% 40% at 20% 20%, rgba(99,102,241,0.07) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 80% 80%, rgba(255,0,127,0.06) 0%, transparent 70%);
  pointer-events: none; z-index: 0;
}

.ex-wrap {
  position: relative; z-index: 1;
  padding: calc(72px + 2.5rem) 1.5rem 5rem;
  min-height: 100vh;
}

.ex-inner {
  max-width: 680px; margin: 0 auto;
}

/* Loading */
.ex-loading {
  display: flex; align-items: center; justify-content: center;
  min-height: 300px;
}
.ex-spinner {
  width: 36px; height: 36px;
  border: 3px solid rgba(255,255,255,0.1);
  border-top-color: rgba(99,102,241,0.8);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Intro screen */
.ex-intro {
  text-align: center; padding: 1rem 0;
}
.ex-intro-icon {
  font-size: 3rem; margin-bottom: 1rem;
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.2);
  border-radius: 50%;
  width: 72px; height: 72px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1.5rem;
}
.ex-intro-icon .material-symbols-outlined { font-size: 2rem; color: rgb(99,102,241); }
.ex-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700; color: #fff; margin: 0 0 0.5rem;
}
.ex-sub {
  color: rgba(255,255,255,0.5); font-size: 0.9rem;
  margin: 0 0 2rem; line-height: 1.6;
}
.ex-rules {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 12px; padding: 1.25rem 1.5rem;
  text-align: left; margin-bottom: 2rem;
  display: flex; flex-direction: column; gap: 0.625rem;
}
.ex-rule {
  display: flex; align-items: center; gap: 0.75rem;
  font-size: 0.875rem; color: rgba(255,255,255,0.6);
}
.ex-rule .material-symbols-outlined { font-size: 1.1rem; color: rgba(99,102,241,0.8); }
.ex-start-btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 2rem; border-radius: 8px; border: none;
  background: rgb(99,102,241); color: #fff; cursor: pointer;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem; font-weight: 600;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}
.ex-start-btn:hover {
  background: rgb(79,82,221); transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(99,102,241,0.35);
}

/* Quiz screen */
.ex-progress-wrap {
  margin-bottom: 1.75rem;
}
.ex-progress-top {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 0.5rem;
  font-size: 0.8rem; color: rgba(255,255,255,0.4);
}
.ex-progress-bar-bg {
  height: 4px; background: rgba(255,255,255,0.07); border-radius: 2px; overflow: hidden;
}
.ex-progress-bar-fill {
  height: 100%; background: rgb(99,102,241); border-radius: 2px;
  transition: width 0.4s ease;
}

.ex-question-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px; padding: 2rem;
  margin-bottom: 1.5rem;
}
.ex-q-num {
  font-size: 0.78rem; font-weight: 600;
  color: rgba(99,102,241,0.7);
  text-transform: uppercase; letter-spacing: 0.07em;
  margin-bottom: 0.875rem;
}
.ex-q-text {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem; font-weight: 600;
  color: rgba(255,255,255,0.9);
  line-height: 1.5; margin-bottom: 1.5rem;
}
.ex-options {
  display: flex; flex-direction: column; gap: 0.625rem;
}
.ex-option {
  display: flex; align-items: center; gap: 0.875rem;
  padding: 0.75rem 1rem; border-radius: 10px;
  border: 1.5px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.02);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.ex-option:hover { border-color: rgba(99,102,241,0.4); background: rgba(99,102,241,0.05); }
.ex-option.selected {
  border-color: rgba(99,102,241,0.6);
  background: rgba(99,102,241,0.1);
}
.ex-option-letter {
  width: 28px; height: 28px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  border: 1.5px solid rgba(255,255,255,0.15);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.78rem; font-weight: 600;
  color: rgba(255,255,255,0.5);
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.ex-option.selected .ex-option-letter {
  background: rgb(99,102,241); border-color: rgb(99,102,241); color: #fff;
}
.ex-option-text { font-size: 0.9rem; color: rgba(255,255,255,0.75); }

/* Nav buttons */
.ex-nav {
  display: flex; justify-content: space-between; gap: 1rem;
}
.ex-nav-btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.6rem 1.25rem; border-radius: 8px; border: none; cursor: pointer;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.9rem; font-weight: 600;
  transition: background 0.2s, transform 0.15s;
}
.ex-nav-btn:hover { transform: translateY(-1px); }
.ex-btn-back {
  background: rgba(255,255,255,0.06); color: rgba(255,255,255,0.7);
}
.ex-btn-back:hover { background: rgba(255,255,255,0.1); }
.ex-btn-next {
  background: rgb(99,102,241); color: #fff; margin-left: auto;
}
.ex-btn-next:hover { background: rgb(79,82,221); }
.ex-btn-next:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
.ex-btn-submit {
  background: #ff007f; color: #fff; margin-left: auto;
}
.ex-btn-submit:hover { background: #e6006f; }
.ex-btn-submit:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
.ex-nav-btn .material-symbols-outlined { font-size: 1rem; }

/* Results screen */
.ex-results { text-align: center; padding: 1rem 0; }
.ex-result-ring-wrap {
  position: relative; width: 120px; height: 120px; margin: 0 auto 1.75rem;
}
.ex-result-ring { width: 120px; height: 120px; transform: rotate(-90deg); }
.ex-ring-bg { fill: none; stroke: rgba(255,255,255,0.07); stroke-width: 8; }
.ex-ring-fill { fill: none; stroke-width: 8; stroke-linecap: round; stroke-dasharray: 314; stroke-dashoffset: 314; transition: stroke-dashoffset 1.2s ease; }
.ex-ring-label {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.ex-ring-score {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem; font-weight: 700; color: #fff; line-height: 1;
}
.ex-ring-sub { font-size: 0.7rem; color: rgba(255,255,255,0.4); margin-top: 2px; }

.ex-result-grade {
  display: inline-block;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.5rem; font-weight: 700;
  margin-bottom: 0.5rem;
}
.ex-result-label {
  font-size: 1.1rem; font-weight: 600; margin-bottom: 0.5rem;
}
.ex-result-sub {
  font-size: 0.875rem; color: rgba(255,255,255,0.4);
  margin-bottom: 2rem;
}
.ex-result-actions { display: flex; gap: 0.875rem; justify-content: center; flex-wrap: wrap; }
.ex-result-btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.65rem 1.25rem; border-radius: 8px; border: none; cursor: pointer;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.9rem; font-weight: 600; text-decoration: none;
  transition: transform 0.15s;
}
.ex-result-btn:hover { transform: translateY(-1px); }
.ex-btn-cert { background: #4ade80; color: #000; }
.ex-btn-dash { background: rgba(255,255,255,0.08); color: rgba(255,255,255,0.8); }
.ex-btn-retry { background: rgba(255,255,255,0.08); color: rgba(255,255,255,0.8); }

@media (max-width: 480px) {
  .ex-question-card { padding: 1.25rem; }
  .ex-title { font-size: 1.4rem; }
}