/* ══════════════════════════════════════════════════════════════════
   SmartExam · Student Theme  —  "Quizo" Modern (purple → magenta)
   ใช้เฉพาะฝั่งนักเรียน (Index / Exam) เท่านั้น ไม่กระทบครู/แอดมิน
   ══════════════════════════════════════════════════════════════════ */

:root {
  /* Brand gradient */
  --se-purple:       #7C3AED;
  --se-purple-deep:  #6D28D9;
  --se-purple-dark:  #5B21B6;
  --se-magenta:      #DB2777;
  --se-magenta-deep: #C026D3;
  --se-pink:         #EC4899;
  --se-grad:         linear-gradient(135deg, #C026D3 0%, #7C3AED 100%);
  --se-grad-rev:     linear-gradient(135deg, #7C3AED 0%, #C026D3 100%);
  --se-grad-x:       linear-gradient(90deg,  #C026D3 0%, #7C3AED 100%);
  --se-grad-soft:    linear-gradient(135deg, #F5E9FF 0%, #FCE7F3 100%);

  /* Neutrals */
  --se-ink:     #2E1065;   /* หัวข้อ ตัวหนา */
  --se-text:    #3B2A5A;   /* ข้อความปกติ */
  --se-muted:   #8B7BA8;   /* ข้อความรอง */
  --se-bg:      #F7F4FF;   /* พื้นหลังอ่อน */
  --se-card:    #FFFFFF;
  --se-border:  #EADDFB;
  --se-surface: #F4EEFF;

  /* Status */
  --se-green:   #22C55E;  --se-green-lt: #E9FBEF;
  --se-red:     #EF4444;  --se-red-lt:   #FEECEC;
  --se-amber:   #F59E0B;  --se-amber-lt: #FEF3E2;

  /* Shape & depth */
  --se-radius:      18px;
  --se-radius-lg:   28px;
  --se-radius-pill: 999px;
  --se-shadow:      0 12px 32px rgba(124,58,237,.14);
  --se-shadow-lg:   0 30px 70px rgba(88,28,135,.30);
  --se-shadow-btn:  0 10px 24px rgba(192,38,211,.34);

  --se-font: 'Noto Sans Thai', 'Segoe UI', system-ui, sans-serif;
}

/* ── Diamond-dot pattern background (Quizo style) ──────────────── */
.se-diamond-bg {
  background-color: var(--se-bg);
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='34' height='34' viewBox='0 0 34 34'%3E%3Crect x='14' y='14' width='6' height='6' transform='rotate(45 17 17)' fill='%237C3AED' fill-opacity='0.07'/%3E%3C/svg%3E");
  background-size: 34px 34px;
}

/* ── Buttons ───────────────────────────────────────────────────── */
.se-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 14px 26px; border: 0; border-radius: var(--se-radius-pill);
  font-family: var(--se-font); font-size: 1rem; font-weight: 800;
  cursor: pointer; transition: transform .18s ease, box-shadow .18s ease, background .18s;
  position: relative; overflow: hidden; line-height: 1; text-decoration: none;
}
.se-btn-primary {
  background: var(--se-grad-x); background-size: 180% 100%; color: #fff;
  box-shadow: var(--se-shadow-btn), inset 0 1px 0 rgba(255,255,255,.22);
}
.se-btn-primary:hover:not(:disabled) {
  transform: translateY(-2px); background-position: 100% 0;
  box-shadow: 0 16px 34px rgba(124,58,237,.42), inset 0 1px 0 rgba(255,255,255,.25);
}
.se-btn-primary:active:not(:disabled) { transform: translateY(0); }
.se-btn-primary::after {
  content: ''; position: absolute; top: 0; left: -140%; width: 55%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.35), transparent);
  animation: se-shimmer 3s ease-in-out infinite;
}
@keyframes se-shimmer { 0% { left: -140%; } 60%,100% { left: 220%; } }

.se-btn-ghost {
  background: #fff; color: var(--se-purple-deep);
  border: 2px solid var(--se-border);
  box-shadow: 0 4px 14px rgba(124,58,237,.08);
}
.se-btn-ghost:hover:not(:disabled) {
  border-color: var(--se-purple); color: var(--se-purple);
  transform: translateY(-2px);
}
.se-btn:disabled {
  background: #EDE7F6; color: var(--se-muted);
  cursor: not-allowed; box-shadow: none; transform: none;
}
.se-btn:disabled::after { display: none; }
.se-btn-block { width: 100%; }

/* ── Chips / tags ──────────────────────────────────────────────── */
.se-chip {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 7px 14px; border-radius: var(--se-radius-pill);
  font-size: .76rem; font-weight: 800; white-space: nowrap;
}
.se-chip-glass {
  background: rgba(255,255,255,.14); color: #fff;
  border: 1px solid rgba(255,255,255,.28);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}

/* ── Pulse dot ─────────────────────────────────────────────────── */
.se-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--se-green); display: inline-block;
  box-shadow: 0 0 0 0 rgba(34,197,94,.6); animation: se-pulse 1.6s infinite;
}
@keyframes se-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(34,197,94,.55); }
  70%  { box-shadow: 0 0 0 8px rgba(34,197,94,0); }
  100% { box-shadow: 0 0 0 0 rgba(34,197,94,0); }
}

/* ── Floating diamonds (decorative) ────────────────────────────── */
.se-float {
  position: absolute; border-radius: 8px; opacity: .5;
  transform: rotate(45deg); pointer-events: none;
  animation: se-bob 6s ease-in-out infinite;
}
@keyframes se-bob {
  0%,100% { transform: rotate(45deg) translateY(0); }
  50%     { transform: rotate(45deg) translateY(-14px); }
}