/* ===============================
   LIGHT THEME (DEFAULT)
================================ */
:root {
  --bg: #f5f5f7;               /* Apple light background */
  --card-bg: #ffffff;
  --text: #1d1d1f;             /* Apple near-black text */
  --muted: #6e6e73;            /* Apple secondary text */
  --primary: #0071e3;          /* Apple blue */
  --border: rgba(0,0,0,.08);   /* Apple ultra-thin border */
  --iconcolor: #1d1d1f;
  --progress-bg: #e8e8ed;
}

/* ===============================
   DARK THEME
================================ */
[data-theme="dark"] {
  --bg: #000000;               /* Apple true black */
  --card-bg: #1d1d1f;          /* Apple dark card */
  --text: #f5f5f7;
  --muted: #a1a1a6;            /* Apple dark muted */
  --primary: #0071e3;          /* same Apple blue in dark */
  --border: rgba(255,255,255,.1);
  --iconcolor: #ffffff;
  --progress-bg: #2d2d2f;
  --text-color: #f5f5f7;
}

/* ===============================
   GLOBAL STYLES
================================ */
body {
  background-color: var(--bg);
  color: var(--text);
  font-family: -apple-system, 'SF Pro Text', BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4, h5, h6 {
  letter-spacing: -0.01em;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* ===============================
   NAVBAR
================================ */
.navbar {
  border-bottom: none;
}

.navbar .nav-link,
.navbar .navbar-brand {
  font-weight: 600;
}

.navbar-toggler-icon {
  filter: brightness(0) invert(0);
}

[data-theme="dark"] .navbar-toggler-icon {
  filter: brightness(0) invert(1);
}

/* ===============================
   CARDS
================================ */
.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 12px 25px rgba(0,0,0,0.08);
}

[data-theme="dark"] .card {
  box-shadow: 0 12px 25px rgba(0,0,0,0.25);
}

/* ===============================
   QUIZ HEADER + STICKY BAR
================================ */
.sticky-top {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border);
  z-index: 1020;
}

.sticky-top h1,
.sticky-top h2,
.sticky-top h3,
.sticky-top h4,
.sticky-top h5,
.sticky-top h6,
.sticky-top p {
  color: var(--text);
}

/* ===============================
   QUIZ QUESTIONS
================================ */
.quiz-card {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.quiz-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 35px rgba(0,0,0,0.15);
}

.quiz-card h6 {
  color: var(--text);
}

/* ===============================
   OPTIONS (RADIO + LABEL FIX)
================================ */
.form-check-label {
  color: var(--text);
  cursor: pointer;
}

.form-check-input {
  border: 2px solid var(--muted);
  background-color: transparent;
  cursor: pointer;
}

.form-check-input:checked {
  background-color: var(--primary);
  border-color: var(--primary);
}

[data-theme="dark"] .form-check-input {
  accent-color: var(--primary);
}

/* ===============================
   PROGRESS BAR
================================ */
.progress {
  background-color: var(--progress-bg);
}

.progress-bar {
  background-color: var(--primary);
  color: #ffffff;
  font-weight: 600;
}

/* ===============================
   BUTTONS
================================ */
.btn-primary {
  background-color: var(--primary);
  border: none;
  color: #ffffff;
}

.btn-primary:hover {
  filter: brightness(1.15);
}

.btn-outline-secondary {
  color: var(--text);
  border-color: var(--border);
}

.btn-outline-secondary:hover {
  background-color: var(--primary);
  color: #ffffff;
}

/* ===============================
   DIFFICULTY COLORS
================================ */
.text-success { color: #22c55e !important; }
.text-warning { color: #f59e0b !important; }
.text-danger  { color: #b91c1c !important; }

/* ===============================
   ICONS & FOOTER
================================ */
.bi {
  color: var(--iconcolor);
}

footer {
  background-color: var(--card-bg);
  color: var(--text);
}

/* ===============================
   TYPOGRAPHY
================================ */
h1, h2, h3, h4, h5, h6,
p, small, li {
  color: var(--text);
}

/* ===============================
   MOBILE OPTIMIZATION
================================ */
@media (max-width: 768px) {
  .sticky-top h2 {
    font-size: 1.2rem;
  }

  .quiz-card h6 {
    font-size: 0.95rem;
  }

  .form-check-label {
    font-size: 0.95rem;
  }

  .btn-lg {
    padding: 0.6rem 1.2rem;
    font-size: 1rem;
  }
}

/* Navbar */
.app-navbar {
  z-index: 1200;
}

/* Quiz header stays under navbar */
.quiz-sticky-header {
  position: sticky;
  top: 56px; /* navbar height (Bootstrap default) */
  z-index: 1100;
  background-color: var(--card-bg);
  padding-top: 10px;
}

/* Quiz content scrolls under both */
.quiz-content {
  margin-top: 140px; /* navbar + quiz header height */
}

.quiz-content {
  padding-top: 50px; /* space = sticky header height */
}

.result-content {
  padding-top: 50px; /* space = sticky header height */
}



/* ===============================
   NAVBAR ACTIVE LINK
================================ */
.navbar .nav-link.active {
  color: var(--primary) !important;
  font-weight: 600;
}

[data-theme="dark"] .navbar .nav-link.active {
  color: #ffffff !important;
}

[data-theme="dark"] .navbar .nav-link {
  color: rgba(255,255,255,.85) !important;
}

[data-theme="dark"] .navbar .nav-link:hover {
  color: #ffffff !important;
}

/* ===============================
   BOOTSTRAP OVERRIDES — DARK MODE
   Fix classes that hardcode colors
   and don't respect CSS variables
================================ */

/* Bootstrap's text-muted uses hardcoded grey — override with var(--muted) */
.text-muted {
  color: var(--muted) !important;
}

/* Bootstrap's text-secondary also hardcodes */
.text-secondary {
  color: var(--muted) !important;
}

/* Bootstrap's small tag loses color in dark mode */
small, .small {
  color: var(--text);
}

/* Bootstrap's lead paragraph */
.lead {
  color: var(--text);
}

/* Fix span and div text that inherits nothing */
span, div {
  color: inherit;
}

/* Fix Bootstrap badge text */
.badge {
  color: #ffffff !important;
}
.bg-warning.text-dark,
.badge.bg-warning {
  color: #1f2933 !important;
}

/* ── Avatar ── */
        .avatar-circle {
            width: 80px; height: 80px; border-radius: 50%;
            display: flex; align-items: center; justify-content: center;
            font-size: 2rem; font-weight: 800; color: #fff;
            flex-shrink: 0;
        }

        /* ── Stat cards ── */
        .stat-card { border-radius: 14px; padding: 20px 16px; text-align: center; }
        .stat-val   { font-size: 1.8rem; font-weight: 800; line-height: 1; }
        .stat-lbl   { font-size: 0.78rem; color: var(--muted); margin-top: 5px; }

        /* ── History table ── */
        .history-row { border-radius: 10px; padding: 12px 16px; margin-bottom: 8px; border: 1px solid var(--border); background: var(--card-bg); }
        .grade-pill  { width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 0.9rem; color: #fff; flex-shrink: 0; }

        /* ── Accuracy bar ── */
        .acc-bar-wrap { height: 6px; border-radius: 3px; background: var(--border); overflow: hidden; flex: 1; }
        .acc-bar      { height: 100%; border-radius: 3px; transition: width 1s ease; }

        /* ── Tab nav ── */
        .profile-tab { border: none; background: none; padding: 10px 18px; font-weight: 600; color: var(--muted); border-bottom: 3px solid transparent; cursor: pointer; transition: all 0.2s; }
        .profile-tab.active { color: var(--primary); border-bottom-color: var(--primary); }

        /* ── Section card ── */
        .section-card { border-radius: 14px; padding: 24px; margin-bottom: 20px; }

        /* ── Streak badge ── */
        .streak-badge { background: linear-gradient(135deg, #f59e0b, #ef4444); color: #fff; border-radius: 20px; padding: 4px 14px; font-size: 0.85rem; font-weight: 700; }

        /* ── Daily history ── */
        .daily-dot { width: 42px; height: 42px; border-radius: 10px; display: flex; flex-direction: column; align-items: center; justify-content: center; font-size: 0.7rem; font-weight: 700; }
        .daily-dot.played  { background: rgba(34,197,94,0.15); border: 2px solid #22c55e; color: #22c55e; }
        .daily-dot.missed  { background: var(--bg); border: 2px dashed var(--border); color: var(--muted); }

        /* ── Settings form ── */
        .settings-section { border-top: 1px solid var(--border); padding-top: 20px; margin-top: 20px; }
        .settings-section:first-child { border-top: none; padding-top: 0; margin-top: 0; }

/* Fix Bootstrap alert text in dark mode */
[data-theme="dark"] .alert {
  background-color: var(--card-bg);
  border-color: var(--border);
  color: var(--text);
}
[data-theme="dark"] .alert-info    { border-left: 4px solid #38bdf8; }
[data-theme="dark"] .alert-warning { border-left: 4px solid #f59e0b; }
[data-theme="dark"] .alert-success { border-left: 4px solid #22c55e; }
[data-theme="dark"] .alert-danger  { border-left: 4px solid #ef4444; }

/* Fix Bootstrap's .form-check-label in dark mode */
[data-theme="dark"] .form-check-label {
  color: var(--text);
}

/* Fix Bootstrap input backgrounds in dark mode */
[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
  background-color: var(--card-bg);
  border-color: var(--border);
  color: var(--text);
}
[data-theme="dark"] .form-control::placeholder {
  color: var(--muted);
}
[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus {
  background-color: var(--card-bg);
  border-color: var(--primary);
  color: var(--text);
  box-shadow: 0 0 0 0.2rem rgba(139, 141, 251, 0.25);
}

/* Fix Bootstrap outline buttons in dark mode */
[data-theme="dark"] .btn-outline-secondary {
  color: var(--text);
  border-color: var(--border);
}
[data-theme="dark"] .btn-outline-primary {
  color: var(--primary);
  border-color: var(--primary);
}
[data-theme="dark"] .btn-outline-success {
  color: #22c55e;
  border-color: #22c55e;
}
[data-theme="dark"] .btn-outline-warning {
  color: #f59e0b;
  border-color: #f59e0b;
}
[data-theme="dark"] .btn-outline-danger {
  color: #ef4444;
  border-color: #ef4444;
}
[data-theme="dark"] .btn-outline-info {
  color: #38bdf8;
  border-color: #38bdf8;
}
[data-theme="dark"] .btn-close {
  filter: invert(1);
}

/* Fix collapse/accordion content in dark mode */
[data-theme="dark"] .collapse,
[data-theme="dark"] .collapsing {
  color: var(--text);
}

/* Fix Bootstrap table — override --bs-table-bg which defaults to white */
[data-theme="dark"] .table {
  --bs-table-bg: transparent;
  --bs-table-striped-bg: rgba(255,255,255,.03);
  --bs-table-hover-bg: rgba(255,255,255,.05);
  --bs-table-color: var(--text);
  --bs-table-border-color: var(--border);
  color: var(--text);
  border-color: var(--border);
}
[data-theme="dark"] .table thead th,
[data-theme="dark"] .table > :not(caption) > * {
  border-color: var(--border);
}
[data-theme="dark"] .table-responsive {
  background-color: var(--card-bg);
}

/* Fix Bootstrap modal in dark mode */
[data-theme="dark"] .modal-content {
  background-color: var(--card-bg);
  border-color: var(--border);
  color: var(--text);
}
[data-theme="dark"] .modal-header,
[data-theme="dark"] .modal-footer {
  border-color: var(--border);
}

/* Fix Bootstrap list-group in dark mode */
[data-theme="dark"] .list-group-item {
  background-color: var(--card-bg);
  border-color: var(--border);
  color: var(--text);
}

/* Fix opacity utility — text can become invisible in dark mode */
[data-theme="dark"] .opacity-75 {
  opacity: 1 !important;
  color: var(--muted);
}
[data-theme="dark"] .opacity-50 {
  opacity: 1 !important;
  color: var(--muted);
}

/* Fix text-light — designed for dark backgrounds only */
[data-theme="dark"] .text-light {
  color: var(--text) !important;
}

/* Fix Bootstrap's bg-light in dark mode */
[data-theme="dark"] .bg-light {
  background-color: var(--card-bg) !important;
}

/* Fix Bootstrap's border utility */
[data-theme="dark"] .border {
  border-color: var(--border) !important;
}

/* Fix Bootstrap's bg-white */
[data-theme="dark"] .bg-white {
  background-color: var(--card-bg) !important;
}

/* Fix Bootstrap's text-dark */
[data-theme="dark"] .text-dark {
  color: var(--text) !important;
}

/* Fix Bootstrap's bg-opacity utilities that break in dark mode */
[data-theme="dark"] .bg-primary.bg-opacity-10  { background-color: rgba(139, 141, 251, 0.15) !important; }
[data-theme="dark"] .bg-success.bg-opacity-10  { background-color: rgba(34, 197, 94, 0.15)   !important; }
[data-theme="dark"] .bg-warning.bg-opacity-10  { background-color: rgba(245, 158, 11, 0.15)  !important; }
[data-theme="dark"] .bg-danger.bg-opacity-10   { background-color: rgba(239, 68, 68, 0.15)   !important; }

/* Fix Bootstrap dropdown in dark mode */
[data-theme="dark"] .dropdown-menu {
  background-color: var(--card-bg);
  border-color: var(--border);
}
[data-theme="dark"] .dropdown-item {
  color: var(--text);
}
[data-theme="dark"] .dropdown-item:hover {
  background-color: var(--bg);
  color: var(--text);
}

/* Fix Bootstrap's nav-tabs in dark mode */
[data-theme="dark"] .nav-tabs {
  border-color: var(--border);
}
[data-theme="dark"] .nav-tabs .nav-link {
  color: var(--muted);
}
[data-theme="dark"] .nav-tabs .nav-link.active {
  background-color: var(--card-bg);
  border-color: var(--border) var(--border) var(--card-bg);
  color: var(--text);
}

[data-theme="dark"] .customwhite,.stat-pill,.stat-val,.fw-semibold {
  color: var(--muted);
}

[data-theme="dark"] .fw-bold {
  color: var(--text);
}



.hero {
            background: linear-gradient(135deg, #63f06a, #8f94fb);
            color: white;
            padding: 60px 0;
            text-align: center;
            border-radius: 0 0 30px 30px;
            margin-bottom: 50px;
            margin-top: 50px;
        }
        .hero h1 { font-size: 2.5rem; font-weight: 700; }
        .hero p  { font-size: 1.2rem; margin-bottom: 30px; }
        .quiz-card { transition: transform 0.2s; }
        .quiz-card:hover { transform: translateY(-3px); }
        .how-icon {
            width: 70px; height: 70px;
            border-radius: 50%;
            display: flex; align-items: center; justify-content: center;
            margin: 0 auto 15px auto;
            font-size: 1.8rem;
        }
        .faq-item { border-left: 4px solid #8f94fb; padding-left: 15px; margin-bottom: 20px; }
        .typing-cursor { display: inline-block; margin-left: 2px; animation: blink 1s infinite; }
        @keyframes blink {
            0%, 50%, 100% { opacity: 1; }
            25%, 75%      { opacity: 0; }
        }
        /* ── Daily Challenge Button ── */
        .btn-challenge {
            position: relative;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            width: 40%;
            padding: 13px 30px;
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            background: linear-gradient(135deg, #1fdb27, #0d6efd);
            border: none;
            border-radius: 12px;
            text-decoration: none;
            letter-spacing: 0.03em;
            overflow: hidden;
            cursor: pointer;
            animation: glowPulse 2.4s ease-in-out infinite;
            transition: transform 0.15s ease, box-shadow 0.15s ease;
        }
        .btn-challenge::before {
            content: '';
            position: absolute;
            top: 0; left: -75%;
            width: 50%; height: 100%;
            background: linear-gradient(120deg, transparent, rgba(255,255,255,0.25), transparent);
            animation: shineSweep 2.4s ease-in-out infinite;
            pointer-events: none;
        }
        .btn-challenge:hover {
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 28px rgba(31,219,39,0.55), 0 2px 8px rgba(13,110,253,0.3);
            animation: none;
        }
        .btn-challenge:active { transform: translateY(1px); }
        .btn-challenge .btn-icon {
            font-size: 1.15rem;
            animation: iconPop 2.4s ease-in-out infinite;
            display: inline-block;
        }
        @keyframes glowPulse {
            0%, 100% { box-shadow: 0 0 10px rgba(31,219,39,0.4), 0 0 20px rgba(31,219,39,0.15); }
            50%       { box-shadow: 0 0 22px rgba(31,219,39,0.7), 0 0 40px rgba(13,110,253,0.25); }
        }
        @keyframes shineSweep {
            0%        { left: -75%; }
            60%, 100% { left: 125%; }
        }
        @keyframes iconPop {
            0%, 100% { transform: scale(1);   }
            50%       { transform: scale(1.2); }
        }