/* ============================================================
   QuizAI – Exam Selection Page Stylesheet
   Version: 1.0.0
   ============================================================ */

/* ─── 1. VARIABLES ──────────────────────────────────────────── */
:root {
  --es-bg:          #07070E;
  --es-bg-2:        #0D0D1A;
  --es-surface:     #111122;
  --es-surface-2:   #181830;
  --es-border:      rgba(255,255,255,0.07);
  --es-border-2:    rgba(255,255,255,0.13);

  --es-accent:      #6C5CE7;
  --es-accent-2:    #A29BFE;
  --es-green:       #00CFA8;
  --es-orange:      #FDCB6E;
  --es-red:         #FF6B6B;
  --es-blue:        #74B9FF;

  --es-text-1:      #F2F2FF;
  --es-text-2:      #8888BB;
  --es-text-3:      #44445A;

  --es-grad:        linear-gradient(135deg, #6C5CE7 0%, #A29BFE 60%, #74B9FF 100%);
  --es-grad-card:   linear-gradient(135deg, rgba(108,92,231,0.07) 0%, rgba(116,185,255,0.03) 100%);

  --font-main:   'Sora', sans-serif;
  --font-hindi:  'Noto Sans Devanagari', sans-serif;
  --font-mono:   'JetBrains Mono', monospace;

  --rad-sm:   6px;
  --rad-md:   12px;
  --rad-lg:   18px;
  --rad-xl:   24px;
  --rad-full: 9999px;

  --ease-out:    cubic-bezier(0.16,1,0.3,1);
  --ease-spring: cubic-bezier(0.34,1.56,0.64,1);
  --t:           0.25s var(--ease-out);

  --shadow-card: 0 8px 40px rgba(0,0,0,0.5), 0 2px 8px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 50px rgba(108,92,231,0.18);
}

/* ─── 2. RESET ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  background: var(--es-bg);
  color: var(--es-text-1);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
button { cursor: pointer; font-family: inherit; border: none; background: none; }
a { text-decoration: none; color: inherit; }
.sr-only { position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0; }

/* ─── 3. PAGE WRAPPER ───────────────────────────────────────── */
.es-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* ─── 4. BACKGROUND ─────────────────────────────────────────── */
.es-bg {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden;
}
.es-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(108,92,231,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(108,92,231,0.05) 1px, transparent 1px);
  background-size: 54px 54px;
  mask-image: radial-gradient(ellipse 85% 85% at 50% 40%, black, transparent);
}
.es-orb {
  position: absolute; border-radius: 50%;
  filter: blur(80px); will-change: transform;
}
.es-orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(108,92,231,0.2) 0%, transparent 70%);
  top: -150px; left: -150px;
  animation: esOrb1 14s ease-in-out infinite;
}
.es-orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(116,185,255,0.12) 0%, transparent 70%);
  bottom: -100px; right: -100px;
  animation: esOrb2 18s ease-in-out infinite;
}
.es-orb-3 {
  width: 260px; height: 260px;
  background: radial-gradient(circle, rgba(0,207,168,0.08) 0%, transparent 70%);
  top: 50%; left: 60%;
  animation: esOrb3 11s ease-in-out infinite;
}
@keyframes esOrb1 { 0%,100%{transform:translate(0,0)}  50%{transform:translate(40px,30px)} }
@keyframes esOrb2 { 0%,100%{transform:translate(0,0)}  50%{transform:translate(-30px,-40px)} }
@keyframes esOrb3 { 0%,100%{transform:translate(0,0)}  50%{transform:translate(20px,-20px)} }

/* ─── 5. TOP NAV ────────────────────────────────────────────── */
.es-topnav {
  position: relative; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 40px;
  height: 64px;
  border-bottom: 1px solid var(--es-border);
  background: rgba(7,7,14,0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.es-logo {
  display: flex; align-items: center; gap: 10px;
}
.es-logo-mark {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--es-grad); position: relative; flex-shrink: 0;
}
.es-logo-mark::after {
  content: ''; position: absolute; inset: 5px;
  border-radius: 4px; background: var(--es-bg);
}
.es-logo-text {
  font-size: 18px; font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--es-grad);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.es-nav-right { display: flex; align-items: center; gap: 16px; }
.es-nav-link {
  display: flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 500; color: var(--es-text-2);
  transition: color var(--t);
}
.es-nav-link:hover { color: var(--es-text-1); }
.es-nav-btn {
  font-size: 13px; font-weight: 600; color: var(--es-text-1);
  padding: 7px 18px; border-radius: var(--rad-md);
  border: 1px solid var(--es-border-2);
  background: rgba(255,255,255,0.04);
  transition: all var(--t);
}
.es-nav-btn:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.2);
}

/* ─── 6. MAIN AREA ──────────────────────────────────────────── */
.es-main {
  position: relative; z-index: 1;
  flex: 1;
  max-width: 860px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 24px 60px;
  display: flex; flex-direction: column; gap: 32px;
}

/* ─── 7. STEP HEADER ────────────────────────────────────────── */
.es-header { text-align: center; }

.es-step-track {
  display: flex; align-items: center; justify-content: center;
  gap: 0; margin-bottom: 24px;
}
.es-step {
  display: flex; flex-direction: column; align-items: center; gap: 5px;
  position: relative;
}
.es-step-num {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1.5px solid var(--es-border-2);
  background: var(--es-surface);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; font-family: var(--font-mono);
  color: var(--es-text-3);
  transition: all 0.4s var(--ease-out);
}
.es-step-label {
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--es-text-3);
  transition: color 0.4s;
}
.es-step.active .es-step-num {
  background: var(--es-accent);
  border-color: var(--es-accent);
  color: #fff;
  box-shadow: 0 0 0 6px rgba(108,92,231,0.15);
}
.es-step.active .es-step-label { color: var(--es-accent-2); }
.es-step.done .es-step-num {
  background: var(--es-green);
  border-color: var(--es-green);
  color: #fff;
}
.es-step.done .es-step-label { color: var(--es-green); }

.es-step-line {
  width: 80px; height: 1.5px;
  background: linear-gradient(90deg, var(--es-border-2), var(--es-border));
  flex-shrink: 0; margin-bottom: 22px;
  transition: background 0.4s;
}
.es-step-line.done {
  background: linear-gradient(90deg, var(--es-green), rgba(0,207,168,0.3));
}

.es-title {
  font-size: clamp(22px, 4vw, 34px); font-weight: 800;
  letter-spacing: -0.02em; color: var(--es-text-1);
  margin-bottom: 6px; font-family: var(--font-hindi);
  transition: all 0.3s var(--ease-out);
}
.es-subtitle {
  font-size: 13px; color: var(--es-text-3);
  font-family: var(--font-mono);
}

/* ─── 8. SECTIONS ───────────────────────────────────────────── */
.es-section { display: none; flex-direction: column; gap: 20px; }
.es-section.active { display: flex; animation: sectionIn 0.4s var(--ease-out); }
@keyframes sectionIn {
  from { opacity:0; transform:translateY(16px); }
  to   { opacity:1; transform:translateY(0); }
}

/* ─── 9. EXAM CARDS ─────────────────────────────────────────── */
.es-exam-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.es-exam-card {
  position: relative; border-radius: var(--rad-xl);
  background: var(--es-surface);
  border: 1.5px solid var(--es-border);
  padding: 24px 20px;
  display: flex; flex-direction: column; gap: 14px;
  text-align: left;
  transition: all 0.25s var(--ease-out);
  overflow: hidden;
  cursor: pointer;
}
.es-exam-card:hover {
  border-color: rgba(108,92,231,0.4);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}
.es-exam-card:focus-visible {
  outline: 2px solid var(--es-accent-2); outline-offset: 3px;
}
.es-exam-card[aria-checked="true"] {
  border-color: var(--es-accent);
  background: linear-gradient(135deg, rgba(108,92,231,0.1) 0%, rgba(116,185,255,0.04) 100%);
  box-shadow: 0 0 0 3px rgba(108,92,231,0.15), var(--shadow-card);
}

.es-card-glow {
  position: absolute; inset: 0; border-radius: var(--rad-xl);
  background: radial-gradient(ellipse at 50% 0%, rgba(108,92,231,0.14), transparent 70%);
  opacity: 0; transition: opacity 0.35s; pointer-events: none;
}
.es-exam-card:hover .es-card-glow,
.es-exam-card[aria-checked="true"] .es-card-glow { opacity: 1; }

.es-card-icon {
  width: 52px; height: 52px; border-radius: var(--rad-md);
  background: rgba(108,92,231,0.1);
  border: 1px solid rgba(108,92,231,0.2);
  display: flex; align-items: center; justify-content: center;
  color: var(--es-accent-2);
  transition: all var(--t);
}
.es-exam-card[aria-checked="true"] .es-card-icon {
  background: rgba(108,92,231,0.2);
  border-color: rgba(108,92,231,0.4);
}

/* SSC / BPSC / Railway alag colors */
.es-exam-card[data-exam="ssc"]     .es-card-icon { background:rgba(108,92,231,0.1);  border-color:rgba(108,92,231,0.2);  color:var(--es-accent-2); }
.es-exam-card[data-exam="bpsc"]    .es-card-icon { background:rgba(0,207,168,0.1);   border-color:rgba(0,207,168,0.2);   color:var(--es-green); }
.es-exam-card[data-exam="railway"] .es-card-icon { background:rgba(253,203,110,0.1); border-color:rgba(253,203,110,0.2); color:var(--es-orange); }

.es-card-name {
  font-size: 18px; font-weight: 800;
  letter-spacing: -0.02em; color: var(--es-text-1);
  margin-bottom: 3px;
}
.es-card-desc {
  font-size: 12px; color: var(--es-text-3);
  line-height: 1.5; margin-bottom: 10px;
}
.es-card-tags {
  display: flex; flex-wrap: wrap; gap: 5px;
}
.es-card-tags span {
  font-size: 10px; font-weight: 600;
  letter-spacing: 0.04em; text-transform: uppercase;
  padding: 3px 8px; border-radius: var(--rad-full);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--es-border);
  color: var(--es-text-3);
}

.es-card-check {
  position: absolute; top: 14px; right: 14px;
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--es-accent);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: scale(0.5);
  transition: all 0.3s var(--ease-spring);
}
.es-card-check svg { width: 12px; height: 12px; stroke: #fff; }
.es-exam-card[aria-checked="true"] .es-card-check,
.es-diff-card[aria-checked="true"]  .es-card-check {
  opacity: 1; transform: scale(1);
}

/* ─── 10. SUBJECT GRID ──────────────────────────────────────── */
.es-subject-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.es-subject-card {
  display: flex; align-items: center; gap: 14px;
  padding: 18px 20px;
  background: var(--es-surface);
  border: 1.5px solid var(--es-border);
  border-radius: var(--rad-lg);
  cursor: pointer; text-align: left;
  transition: all var(--t); position: relative; overflow: hidden;
}
.es-subject-card:hover {
  border-color: rgba(108,92,231,0.4);
  transform: translateY(-2px);
  background: var(--es-surface-2);
}
.es-subject-card:focus-visible {
  outline: 2px solid var(--es-accent-2); outline-offset: 3px;
}
.es-subject-card[aria-checked="true"] {
  border-color: var(--es-accent);
  background: rgba(108,92,231,0.08);
  box-shadow: 0 0 0 3px rgba(108,92,231,0.12);
}
.es-subject-icon {
  width: 44px; height: 44px; border-radius: var(--rad-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; flex-shrink: 0;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--es-border);
  transition: all var(--t);
}
.es-subject-card[aria-checked="true"] .es-subject-icon {
  background: rgba(108,92,231,0.15);
  border-color: rgba(108,92,231,0.3);
}
.es-subject-name {
  font-size: 15px; font-weight: 700;
  color: var(--es-text-1); letter-spacing: -0.01em;
}
.es-subject-qs {
  font-size: 11px; color: var(--es-text-3);
  font-family: var(--font-mono); margin-top: 2px;
}
.es-subject-check {
  position: absolute; top: 12px; right: 12px;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--es-accent);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: scale(0.4);
  transition: all 0.3s var(--ease-spring);
}
.es-subject-check svg { width: 10px; height: 10px; stroke: #fff; stroke-width: 2.5; }
.es-subject-card[aria-checked="true"] .es-subject-check {
  opacity: 1; transform: scale(1);
}

/* ─── 11. DIFFICULTY CARDS ──────────────────────────────────── */
.es-difficulty-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.es-diff-card {
  position: relative;
  background: var(--es-surface);
  border: 1.5px solid var(--es-border);
  border-radius: var(--rad-xl);
  padding: 24px 20px;
  display: flex; flex-direction: column; gap: 12px;
  text-align: left; cursor: pointer;
  transition: all var(--t); overflow: hidden;
}
.es-diff-card:hover {
  border-color: rgba(108,92,231,0.4);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}
.es-diff-card:focus-visible {
  outline: 2px solid var(--es-accent-2); outline-offset: 3px;
}
.es-diff-card[data-difficulty="easy"][aria-checked="true"]   { border-color: var(--es-green);  box-shadow: 0 0 0 3px rgba(0,207,168,0.12); background: rgba(0,207,168,0.06); }
.es-diff-card[data-difficulty="medium"][aria-checked="true"] { border-color: var(--es-orange); box-shadow: 0 0 0 3px rgba(253,203,110,0.12); background: rgba(253,203,110,0.06); }
.es-diff-card[data-difficulty="hard"][aria-checked="true"]   { border-color: var(--es-red);   box-shadow: 0 0 0 3px rgba(255,107,107,0.12); background: rgba(255,107,107,0.06); }

.es-diff-icon { font-size: 32px; line-height: 1; }

.es-diff-name {
  font-size: 17px; font-weight: 800;
  letter-spacing: -0.02em; color: var(--es-text-1);
  margin-bottom: 3px;
}
.es-diff-desc { font-size: 12px; color: var(--es-text-3); line-height: 1.5; }

.es-diff-bars {
  display: flex; gap: 4px; margin-top: 8px;
}
.es-diff-bars .bar {
  height: 4px; width: 28px; border-radius: var(--rad-full);
  background: rgba(255,255,255,0.06);
}
.es-diff-card[data-difficulty="easy"]   .bar.active { background: var(--es-green); }
.es-diff-card[data-difficulty="medium"] .bar.active { background: var(--es-orange); }
.es-diff-card[data-difficulty="hard"]   .bar.active { background: var(--es-red); }

.es-diff-meta {
  display: flex; align-items: center; gap: 8px; margin-top: auto;
}
.es-diff-time, .es-diff-qs {
  font-size: 11px; font-family: var(--font-mono);
  color: var(--es-text-3); padding: 2px 7px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--es-border);
  border-radius: var(--rad-full);
}

/* ─── 12. SUMMARY CARD ──────────────────────────────────────── */
.es-summary-card {
  background: var(--es-surface);
  border: 1px solid var(--es-border-2);
  border-radius: var(--rad-xl);
  padding: 20px 24px;
  animation: sectionIn 0.3s var(--ease-out);
}
.es-summary-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--es-accent-2); margin-bottom: 14px;
}
.es-summary-items {
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: 0;
}
.es-summary-item {
  display: flex; flex-direction: column; gap: 4px;
  padding: 0 16px;
  border-right: 1px solid var(--es-border);
}
.es-summary-item:first-child { padding-left: 0; }
.es-summary-item:last-child { border-right: none; }

.es-si-label {
  font-size: 10px; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--es-text-3);
}
.es-si-val {
  font-size: 14px; font-weight: 700;
  color: var(--es-text-1); font-family: var(--font-mono);
}

/* ─── 13. BREADCRUMB ────────────────────────────────────────── */
.es-breadcrumb {
  display: flex; align-items: center; gap: 12px;
}
.es-back-btn {
  display: flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 500; color: var(--es-text-2);
  padding: 7px 14px; border-radius: var(--rad-md);
  border: 1px solid var(--es-border);
  background: rgba(255,255,255,0.03);
  transition: all var(--t);
}
.es-back-btn:hover { color: var(--es-text-1); background: rgba(255,255,255,0.06); }
.es-selected-badge {
  font-size: 12px; font-weight: 700;
  color: var(--es-accent-2);
  background: rgba(108,92,231,0.1);
  border: 1px solid rgba(108,92,231,0.2);
  padding: 5px 14px; border-radius: var(--rad-full);
}

/* ─── 14. STEP FOOTER ───────────────────────────────────────── */
.es-step-footer {
  display: flex; align-items: center;
  justify-content: space-between;
  padding-top: 4px;
}
.es-footer-spacer { flex: 1; }

/* Language toggle */
.es-lang-toggle {
  display: flex;
  background: var(--es-surface);
  border: 1px solid var(--es-border);
  border-radius: var(--rad-full); padding: 3px; gap: 2px;
}
.es-lang-btn {
  font-size: 13px; font-weight: 500;
  padding: 7px 18px; border-radius: var(--rad-full);
  color: var(--es-text-3); transition: all var(--t);
}
.es-lang-btn.active {
  background: var(--es-accent); color: #fff;
  box-shadow: 0 2px 12px rgba(108,92,231,0.35);
}
.es-lang-btn:hover:not(.active) { color: var(--es-text-1); background: rgba(255,255,255,0.05); }

/* Next button */
.es-next-btn {
  display: flex; align-items: center; gap: 8px;
  font-size: 14px; font-weight: 700; color: #fff;
  padding: 12px 24px; border-radius: var(--rad-md);
  background: var(--es-accent);
  border: 1px solid rgba(255,255,255,0.1);
  transition: all var(--t);
}
.es-next-btn:hover:not(:disabled) {
  background: #7B6CF0; transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(108,92,231,0.45);
}
.es-next-btn:hover:not(:disabled) svg { transform: translateX(3px); }
.es-next-btn svg { transition: transform var(--t); }
.es-next-btn:disabled {
  opacity: 0.35; cursor: not-allowed; transform: none; box-shadow: none;
}

/* Start quiz button */
.es-start-btn {
  display: flex; align-items: center; justify-content: center;
  gap: 10px; min-width: 200px; height: 52px;
  padding: 0 28px; border-radius: var(--rad-md);
  font-size: 16px; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, #6C5CE7, #4834D4);
  border: 1px solid rgba(255,255,255,0.12);
  transition: all var(--t); position: relative; overflow: hidden;
  font-family: var(--font-hindi);
}
.es-start-btn::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.08) 0%, transparent 60%);
  pointer-events: none;
}
.es-start-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(108,92,231,0.55);
}
.es-start-btn:disabled { opacity: 0.35; cursor: not-allowed; }

.es-start-text {
  display: flex; align-items: center; gap: 8px;
  transition: opacity 0.2s;
}
.es-start-spinner {
  position: absolute;
  width: 22px; height: 22px;
  border: 2.5px solid rgba(255,255,255,0.3);
  border-top-color: #fff; border-radius: 50%;
  opacity: 0; animation: spin 0.7s linear infinite;
}
.es-start-btn.loading .es-start-text { opacity: 0; }
.es-start-btn.loading .es-start-spinner { opacity: 1; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── 15. NOISE OVERLAY ─────────────────────────────────────── */
.noise {
  position: fixed; inset: 0; z-index: 9999; pointer-events: none;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ─── 16. RESPONSIVE ────────────────────────────────────────── */
@media (max-width: 780px) {
  .es-topnav { padding: 0 20px; }
  .es-main   { padding: 28px 16px 48px; }
  .es-exam-grid       { grid-template-columns: 1fr; }
  .es-difficulty-grid { grid-template-columns: 1fr; }
  .es-subject-grid    { grid-template-columns: 1fr; }
  .es-summary-items   { grid-template-columns: repeat(2,1fr); gap: 12px; }
  .es-summary-item    { padding: 0; border-right: none; border-bottom: 1px solid var(--es-border); padding-bottom: 10px; }
  .es-summary-item:last-child { border-bottom: none; }
  .es-step-line       { width: 40px; }
  .es-step-footer { flex-wrap: wrap; gap: 12px; }
}

@media (max-width: 480px) {
  .es-step-num  { width: 28px; height: 28px; font-size: 11px; }
  .es-step-line { width: 24px; }
  .es-step-label { font-size: 10px; }
  .es-title { font-size: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

:focus-visible {
  outline: 2px solid var(--es-accent-2);
  outline-offset: 3px;
  border-radius: var(--rad-sm);
}