/* ============================================
   styles.css – Mozgalica: Brain Training App
   Calm, accessible, high-contrast design
   ============================================ */

/* ──────────── GOOGLE FONTS ──────────── */
@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&family=Lora:wght@400;700&display=swap');

/* ──────────── CSS VARIJABLE: DARK (default) ──────────── */
:root {
    --bg-primary:      #0F1117;
    --bg-card:         #1A1D27;
    --bg-card-hover:   #21253A;
    --bg-answer:       #1E2235;
    --bg-answer-hover: #272B42;

    --text-primary:    #F0F2FF;
    --text-secondary:  #9DA3C8;
    --text-muted:      #6B7094;

    --accent-blue:     #5B8AF0;
    --accent-green:    #50C878;
    --accent-orange:   #F0905B;
    --accent-purple:   #A855F7;

    --success-bg:      rgba(80, 200, 120, 0.18);
    --success-border:  #50C878;
    --error-bg:        rgba(240, 90, 90, 0.18);
    --error-border:    #F05A5A;

    --border:          rgba(255,255,255,0.08);
    --border-focus:    rgba(91,138,240,0.5);

    --shadow-card:     0 4px 24px rgba(0,0,0,0.4);
    --shadow-btn:      0 4px 16px rgba(0,0,0,0.3);

    --radius-card:     18px;
    --radius-btn:      14px;

    --transition:      0.25s ease;

    --font-main:       'Nunito', sans-serif;
    --font-accent:     'Lora', serif;
}

/* ──────────── LIGHT MODE ──────────── */
body.light-mode {
    --bg-primary:      #F2F4FB;
    --bg-card:         #FFFFFF;
    --bg-card-hover:   #F0F2FF;
    --bg-answer:       #EEF1FF;
    --bg-answer-hover: #E4E8FF;

    --text-primary:    #1A1D2E;
    --text-secondary:  #4A5080;
    --text-muted:      #8890BB;

    --border:          rgba(0,0,0,0.08);
    --border-focus:    rgba(91,138,240,0.4);

    --shadow-card:     0 4px 24px rgba(0,0,50,0.08);
    --shadow-btn:      0 4px 16px rgba(0,0,50,0.1);
}

/* ──────────── RESET & BASE ──────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 18px;
    -webkit-tap-highlight-color: transparent;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Subtle grain texture */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 0;
    opacity: 0.4;
}

/* ──────────── LAYOUT ──────────── */
.app-wrapper {
    position: relative;
    z-index: 1;
    max-width: 680px;
    margin: 0 auto;
    padding: 0 16px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ──────────── HEADER ──────────── */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0 16px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 28px;
}

.app-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.app-logo .logo-icon {
    font-size: 2rem;
    line-height: 1;
}

.app-logo .logo-text {
    font-family: var(--font-accent);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.app-logo .logo-sub {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    display: block;
    line-height: 1;
    margin-top: 1px;
}

/* ──────────── THEME TOGGLE ──────────── */
.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    width: 44px;
    height: 44px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    flex-shrink: 0;
}

.theme-toggle:hover {
    background: var(--bg-answer);
    color: var(--text-primary);
    border-color: var(--border-focus);
}

/* ──────────── DAILY BADGE ──────────── */
.daily-badge {
    display: flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, rgba(91,138,240,0.15), rgba(168,85,247,0.1));
    border: 1px solid rgba(91,138,240,0.25);
    border-radius: 14px;
    padding: 14px 18px;
    margin-bottom: 28px;
}

.daily-badge .badge-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
}

.daily-badge .badge-text strong {
    display: block;
    font-size: 1rem;
    font-weight: 800;
    color: var(--text-primary);
}

.daily-badge .badge-text span {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ──────────── SECTION TITLE ──────────── */
.section-title {
    font-family: var(--font-accent);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-sub {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    margin-top: -10px;
}

/* ──────────── KATEGORIJE KARTICE ──────────── */
.categories-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 32px;
}

@media (max-width: 400px) {
    .categories-grid {
        grid-template-columns: 1fr;
    }
}

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    padding: 22px 18px;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    right: 0; height: 3px;
    background: var(--card-color, var(--accent-blue));
    border-radius: var(--radius-card) var(--radius-card) 0 0;
    opacity: 0.8;
}

.category-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.5);
    border-color: var(--card-color, var(--border-focus));
}

.category-card:active {
    transform: translateY(0);
}

.category-card .card-icon {
    font-size: 2.2rem;
    line-height: 1;
    margin-bottom: 4px;
}

.category-card .card-name {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
}

.category-card .card-desc {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.category-card .card-count {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.category-card .card-start {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 8px;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--card-color, var(--accent-blue));
}

/* ──────────── QUIZ SCREEN ──────────── */
.quiz-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Progress */
.quiz-progress-wrap {
    margin-bottom: 24px;
}

.quiz-progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.quiz-progress-label {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.quiz-progress-num {
    font-size: 0.9rem;
    font-weight: 800;
    color: var(--text-primary);
}

.progress-bar-track {
    height: 8px;
    background: var(--bg-answer);
    border-radius: 99px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    border-radius: 99px;
    transition: width 0.5s ease;
}

/* Category badge in quiz */
.quiz-category-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 99px;
    padding: 5px 14px;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* Question card */
.question-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    padding: 28px 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-card);
}

.question-text {
    font-family: var(--font-accent);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.5;
}

/* Answer buttons */
.answers-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.answer-btn {
    width: 100%;
    min-height: 58px;
    background: var(--bg-answer);
    border: 2px solid var(--border);
    border-radius: var(--radius-btn);
    padding: 14px 20px;
    cursor: pointer;
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: left;
    display: flex;
    align-items: center;
    gap: 14px;
    transition: all var(--transition);
    box-shadow: var(--shadow-btn);
    -webkit-user-select: none;
    user-select: none;
}

.answer-btn:hover:not(:disabled) {
    background: var(--bg-answer-hover);
    border-color: var(--accent-blue);
    transform: translateX(4px);
}

.answer-btn:active:not(:disabled) {
    transform: translateX(2px);
}

.answer-btn .answer-letter {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--text-secondary);
    flex-shrink: 0;
    transition: all var(--transition);
}

.answer-btn .answer-text {
    flex: 1;
    line-height: 1.35;
}

/* Correct / Wrong states */
.answer-btn.correct {
    background: var(--success-bg) !important;
    border-color: var(--success-border) !important;
    animation: pulse-correct 0.4s ease;
}

.answer-btn.correct .answer-letter {
    background: var(--success-border);
    color: #fff;
}

.answer-btn.wrong {
    background: var(--error-bg) !important;
    border-color: var(--error-border) !important;
    animation: shake 0.4s ease;
}

.answer-btn.wrong .answer-letter {
    background: var(--error-border);
    color: #fff;
}

.answer-btn:disabled {
    cursor: default;
    transform: none !important;
}

/* Feedback message */
.feedback-msg {
    text-align: center;
    padding: 14px 20px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.feedback-msg.show {
    opacity: 1;
}

.feedback-msg.correct {
    background: var(--success-bg);
    color: var(--success-border);
    border: 1px solid rgba(80,200,120,0.3);
}

.feedback-msg.wrong {
    background: var(--error-bg);
    color: #F07070;
    border: 1px solid rgba(240,90,90,0.3);
}

/* ──────────── REZULTAT EKRAN ──────────── */
.result-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding-top: 20px;
}

.result-trophy {
    font-size: 5rem;
    margin-bottom: 16px;
    animation: bounceIn 0.6s ease;
}

.result-score-circle {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 4px solid var(--accent-blue);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    box-shadow: 0 0 40px rgba(91,138,240,0.2);
}

.result-score-main {
    font-family: var(--font-accent);
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.result-score-sub {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.result-message {
    font-family: var(--font-accent);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    padding: 0 16px;
}

.result-submsg {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    padding: 0 24px;
    line-height: 1.5;
}

/* Stars */
.result-stars {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 28px;
    font-size: 2rem;
}

.result-stars .star {
    opacity: 0.2;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.result-stars .star.lit {
    opacity: 1;
    animation: starPop 0.4s ease forwards;
}

/* Result buttons */
.result-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
    max-width: 400px;
}

/* ──────────── BUTTONS ──────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 28px;
    border-radius: var(--radius-btn);
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 800;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    min-height: 56px;
    text-decoration: none;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), #7B6CF0);
    color: #fff;
    box-shadow: 0 6px 20px rgba(91,138,240,0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(91,138,240,0.45);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg-answer);
    border-color: var(--accent-blue);
}

.btn:active {
    transform: translateY(0) !important;
}

.btn-full {
    width: 100%;
}

/* ──────────── ADMIN PANEL ──────────── */
.admin-panel {
    padding: 24px 0;
}

.admin-panel h1 {
    font-family: var(--font-accent);
    font-size: 1.8rem;
    margin-bottom: 8px;
}

.admin-warning {
    background: rgba(240,144,91,0.12);
    border: 1px solid rgba(240,144,91,0.3);
    border-radius: 12px;
    padding: 12px 16px;
    font-size: 0.85rem;
    color: var(--accent-orange);
    margin-bottom: 24px;
}

.form-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    padding: 28px 24px;
    margin-bottom: 28px;
}

.form-card h2 {
    font-size: 1.1rem;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 7px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    background: var(--bg-answer);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 13px 16px;
    font-family: var(--font-main);
    font-size: 1rem;
    color: var(--text-primary);
    transition: border-color var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent-blue);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-group select option {
    background: var(--bg-card);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.success-flash {
    background: var(--success-bg);
    border: 1px solid rgba(80,200,120,0.3);
    color: var(--success-border);
    border-radius: 12px;
    padding: 14px 18px;
    font-weight: 700;
    margin-bottom: 20px;
    text-align: center;
}

/* Admin table */
.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.admin-table th {
    text-align: left;
    padding: 10px 12px;
    color: var(--text-muted);
    font-weight: 700;
    border-bottom: 1px solid var(--border);
}

.admin-table td {
    padding: 12px 12px;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

.admin-table tr:last-child td {
    border-bottom: none;
}

.badge-correct {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--accent-blue);
    color: #fff;
    font-weight: 800;
    font-size: 0.85rem;
}

/* ──────────── FOOTER ──────────── */
.app-footer {
    text-align: center;
    padding: 24px 0 20px;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    margin-top: auto;
}

.footer-nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 10px;
}

.footer-nav a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition);
}

.footer-nav a:hover {
    color: var(--accent-blue);
}

/* ──────────── PAGE TRANSITIONS ──────────── */
.page-enter {
    animation: fadeSlideIn 0.3s ease forwards;
}

/* ──────────── KEYFRAMES ──────────── */
@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse-correct {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.02); }
    100% { transform: scale(1); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%      { transform: translateX(-6px); }
    40%      { transform: translateX(6px); }
    60%      { transform: translateX(-4px); }
    80%      { transform: translateX(4px); }
}

@keyframes bounceIn {
    0%   { transform: scale(0.5); opacity: 0; }
    60%  { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

@keyframes starPop {
    0%   { transform: scale(0) rotate(-20deg); }
    60%  { transform: scale(1.3) rotate(5deg); }
    100% { transform: scale(1) rotate(0deg); }
}

/* ──────────── LOADING STATE ──────────── */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    color: var(--text-muted);
    font-size: 1rem;
}

.loading::after {
    content: '';
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 12px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ──────────── RESPONSIVE ──────────── */
@media (min-width: 520px) {
    html { font-size: 19px; }
    .question-text { font-size: 1.35rem; }
    .answer-btn { font-size: 1.05rem; }
}

@media (min-width: 680px) {
    html { font-size: 20px; }
    .app-wrapper { padding: 0 24px; }
    .categories-grid { gap: 18px; }
    .result-actions { flex-direction: row; }
    .btn { padding: 16px 32px; }
}

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

:focus-visible {
    outline: 3px solid var(--accent-blue);
    outline-offset: 3px;
    border-radius: 8px;
}