/*
Theme Name: Library MFR
Theme URI: https://library-mfr.ro
Author: Studio MFR
Author URI: https://library-mfr.ro
Description: E-learning platform for Physical Medicine & Rehabilitation (Medicină Fizică și de Reabilitare). Structured curriculum with auto-parsed content, quizzes, summaries, and discussion forums.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.7
Requires PHP: 8.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: library-mfr
Tags: education, medical, e-learning, custom-menu, featured-images
*/

/* ==========================================================================
   CSS CUSTOM PROPERTIES
   ========================================================================== */

:root {
    /* Primary palette — clinical navy + warm accent */
    --mfr-navy: #0B1D3A;
    --mfr-navy-light: #142D54;
    --mfr-navy-muted: #1E3A5F;
    --mfr-teal: #00897B;
    --mfr-teal-light: #4DB6AC;
    --mfr-teal-pale: #E0F2F1;
    --mfr-amber: #F5A623;
    --mfr-amber-light: #FFD180;
    --mfr-red: #E53935;
    --mfr-green: #43A047;

    /* Neutrals */
    --mfr-white: #FFFFFF;
    --mfr-off-white: #F7F8FA;
    --mfr-gray-100: #F0F1F3;
    --mfr-gray-200: #E2E4E8;
    --mfr-gray-300: #C5C9D1;
    --mfr-gray-500: #6B7280;
    --mfr-gray-700: #374151;
    --mfr-gray-900: #111827;

    /* Typography */
    --font-display: 'DM Serif Display', Georgia, serif;
    --font-heading: 'Plus Jakarta Sans', 'Segoe UI', sans-serif;
    --font-body: 'Source Sans 3', 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;

    /* Spacing scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Layout */
    --max-width: 1200px;
    --sidebar-width: 300px;
    --border-radius: 8px;
    --border-radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(11, 29, 58, 0.06);
    --shadow-md: 0 4px 12px rgba(11, 29, 58, 0.08);
    --shadow-lg: 0 8px 30px rgba(11, 29, 58, 0.12);
    --shadow-card: 0 2px 8px rgba(11, 29, 58, 0.06), 0 0 0 1px rgba(11, 29, 58, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   RESET & BASE
   ========================================================================== */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--mfr-gray-900);
    background-color: var(--mfr-off-white);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--mfr-teal);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--mfr-navy);
}

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    color: var(--mfr-navy);
}

h1 { font-size: 2.25rem; letter-spacing: -0.02em; }
h2 { font-size: 1.75rem; letter-spacing: -0.01em; }
h3 { font-size: 1.375rem; }
h4 { font-size: 1.125rem; }

.display-title {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 400;
    letter-spacing: -0.03em;
    line-height: 1.15;
}

/* ==========================================================================
   LAYOUT
   ========================================================================== */

.mfr-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.mfr-grid {
    display: grid;
    gap: var(--space-xl);
}

.mfr-grid--2 { grid-template-columns: repeat(2, 1fr); }
.mfr-grid--3 { grid-template-columns: repeat(3, 1fr); }
.mfr-grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
    .mfr-grid--2, .mfr-grid--3, .mfr-grid--4 {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */

.mfr-header {
    background: var(--mfr-navy);
    color: var(--mfr-white);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
}

.mfr-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    max-width: var(--max-width);
    margin: 0 auto;
}

.mfr-header__logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--mfr-white);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.mfr-header__logo span {
    color: var(--mfr-teal-light);
}

.mfr-nav ul {
    list-style: none;
    display: flex;
    gap: var(--space-lg);
}

.mfr-nav a {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-sm) 0;
    position: relative;
}

.mfr-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--mfr-teal-light);
    transition: width var(--transition-base);
}

.mfr-nav a:hover,
.mfr-nav a.current {
    color: var(--mfr-white);
}

.mfr-nav a:hover::after,
.mfr-nav a.current::after {
    width: 100%;
}

/* Mobile menu toggle */
.mfr-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--mfr-white);
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .mfr-menu-toggle { display: block; }
    .mfr-nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--mfr-navy);
        padding: var(--space-lg);
        box-shadow: var(--shadow-lg);
    }
    .mfr-nav.active ul { display: flex; }
}

/* ==========================================================================
   BREADCRUMBS
   ========================================================================== */

.mfr-breadcrumbs {
    padding: var(--space-md) 0;
    font-size: 0.85rem;
    color: var(--mfr-gray-500);
}

.mfr-breadcrumbs a {
    color: var(--mfr-gray-500);
}

.mfr-breadcrumbs a:hover {
    color: var(--mfr-teal);
}

.mfr-breadcrumbs .separator {
    margin: 0 var(--space-sm);
    opacity: 0.5;
}

/* ==========================================================================
   SECTION CARDS (HOMEPAGE / LIBRARY INDEX)
   ========================================================================== */

.mfr-section-card {
    background: var(--mfr-white);
    border-radius: var(--border-radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-base);
    border-left: 4px solid transparent;
    position: relative;
    overflow: hidden;
}

.mfr-section-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-left-color: var(--mfr-teal);
}

.mfr-section-card__number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    color: var(--mfr-teal-pale);
    line-height: 1;
    margin-bottom: var(--space-sm);
}

.mfr-section-card__title {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
}

.mfr-section-card__count {
    font-size: 0.85rem;
    color: var(--mfr-gray-500);
}

.mfr-section-card__topics {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--mfr-gray-200);
}

.mfr-section-card__topics a {
    display: block;
    padding: var(--space-xs) 0;
    font-size: 0.9rem;
    color: var(--mfr-gray-700);
}

.mfr-section-card__topics a:hover {
    color: var(--mfr-teal);
    padding-left: var(--space-sm);
}

/* ==========================================================================
   TOPIC PAGE LAYOUT
   ========================================================================== */

.mfr-topic-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    gap: var(--space-2xl);
    padding: var(--space-2xl) 0;
}

@media (max-width: 968px) {
    .mfr-topic-layout {
        grid-template-columns: 1fr;
    }
}

/* Topic sidebar / table of contents */
.mfr-topic-sidebar {
    position: sticky;
    top: 80px;
    align-self: start;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
}

.mfr-toc {
    background: var(--mfr-white);
    border-radius: var(--border-radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-card);
}

.mfr-toc__title {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--mfr-gray-500);
    margin-bottom: var(--space-md);
}

.mfr-toc__list {
    list-style: none;
}

.mfr-toc__item {
    margin-bottom: var(--space-xs);
}

.mfr-toc__link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    color: var(--mfr-gray-700);
    transition: all var(--transition-fast);
}

.mfr-toc__link:hover,
.mfr-toc__link.active {
    background: var(--mfr-teal-pale);
    color: var(--mfr-teal);
}

.mfr-toc__icon {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    flex-shrink: 0;
}

.mfr-toc__icon--chapter { background: var(--mfr-teal-pale); color: var(--mfr-teal); }
.mfr-toc__icon--quiz { background: #FFF3E0; color: var(--mfr-amber); }
.mfr-toc__icon--summary { background: #E8F5E9; color: var(--mfr-green); }
.mfr-toc__icon--forum { background: #E3F2FD; color: #1976D2; }

/* ==========================================================================
   CONTENT AREA
   ========================================================================== */

.mfr-content {
    background: var(--mfr-white);
    border-radius: var(--border-radius-lg);
    padding: var(--space-2xl) var(--space-3xl);
    box-shadow: var(--shadow-card);
    min-height: 60vh;
}

.mfr-content h1 { margin-bottom: var(--space-lg); }
.mfr-content h2 { margin: var(--space-2xl) 0 var(--space-md); padding-top: var(--space-lg); border-top: 1px solid var(--mfr-gray-200); }
.mfr-content h3 { margin: var(--space-xl) 0 var(--space-md); }
.mfr-content p { margin-bottom: var(--space-md); }
.mfr-content ul, .mfr-content ol { margin-bottom: var(--space-md); padding-left: var(--space-xl); }
.mfr-content li { margin-bottom: var(--space-xs); }
.mfr-content table { width: 100%; border-collapse: collapse; margin: var(--space-lg) 0; font-size: 0.9rem; }
.mfr-content th { background: var(--mfr-navy); color: var(--mfr-white); padding: var(--space-sm) var(--space-md); text-align: left; font-weight: 600; }
.mfr-content td { padding: var(--space-sm) var(--space-md); border-bottom: 1px solid var(--mfr-gray-200); }
.mfr-content tr:hover td { background: var(--mfr-gray-100); }

/* ==========================================================================
   QUIZ COMPONENT
   ========================================================================== */

.mfr-quiz {
    background: var(--mfr-off-white);
    border: 2px solid var(--mfr-gray-200);
    border-radius: var(--border-radius-lg);
    padding: var(--space-xl);
    margin: var(--space-2xl) 0;
}

.mfr-quiz__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.mfr-quiz__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    background: var(--mfr-amber);
    color: var(--mfr-white);
    padding: var(--space-xs) var(--space-md);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.mfr-quiz__progress {
    font-size: 0.85rem;
    color: var(--mfr-gray-500);
}

.mfr-quiz__question {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--mfr-navy);
    margin-bottom: var(--space-lg);
    line-height: 1.5;
}

.mfr-quiz__options {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.mfr-quiz__option {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    border: 2px solid var(--mfr-gray-200);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    background: var(--mfr-white);
}

.mfr-quiz__option:hover {
    border-color: var(--mfr-teal-light);
    background: var(--mfr-teal-pale);
}

.mfr-quiz__option.selected {
    border-color: var(--mfr-teal);
    background: var(--mfr-teal-pale);
}

.mfr-quiz__option.correct {
    border-color: var(--mfr-green);
    background: #E8F5E9;
}

.mfr-quiz__option.incorrect {
    border-color: var(--mfr-red);
    background: #FFEBEE;
}

.mfr-quiz__option-letter {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
    background: var(--mfr-gray-200);
    color: var(--mfr-gray-700);
}

.mfr-quiz__option.selected .mfr-quiz__option-letter {
    background: var(--mfr-teal);
    color: var(--mfr-white);
}

.mfr-quiz__actions {
    margin-top: var(--space-lg);
    display: flex;
    gap: var(--space-md);
}

.mfr-quiz__explanation {
    margin-top: var(--space-lg);
    padding: var(--space-md);
    background: #E3F2FD;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    line-height: 1.6;
    border-left: 4px solid #1976D2;
}

/* ==========================================================================
   SUMMARY / RECAP BLOCK
   ========================================================================== */

.mfr-summary {
    background: linear-gradient(135deg, var(--mfr-teal-pale) 0%, #E8F5E9 100%);
    border-radius: var(--border-radius-lg);
    padding: var(--space-xl);
    margin: var(--space-2xl) 0;
    border: 1px solid rgba(0, 137, 123, 0.15);
}

.mfr-summary__title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.125rem;
    color: var(--mfr-teal);
    margin-bottom: var(--space-md);
}

.mfr-summary__content {
    font-size: 0.95rem;
    line-height: 1.7;
}

.mfr-summary__checkpoints {
    list-style: none;
    margin-top: var(--space-md);
}

.mfr-summary__checkpoints li {
    padding: var(--space-sm) 0;
    padding-left: var(--space-lg);
    position: relative;
    border-bottom: 1px solid rgba(0, 137, 123, 0.1);
}

.mfr-summary__checkpoints li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--mfr-teal);
    font-weight: 700;
}

/* ==========================================================================
   PROGRESS TRACKER
   ========================================================================== */

.mfr-progress {
    background: var(--mfr-white);
    border-radius: var(--border-radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-card);
    margin-bottom: var(--space-lg);
}

.mfr-progress__bar {
    height: 8px;
    background: var(--mfr-gray-200);
    border-radius: 4px;
    overflow: hidden;
    margin-top: var(--space-sm);
}

.mfr-progress__fill {
    height: 100%;
    background: linear-gradient(90deg, var(--mfr-teal) 0%, var(--mfr-teal-light) 100%);
    border-radius: 4px;
    transition: width var(--transition-slow);
}

.mfr-progress__stats {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-sm);
    font-size: 0.8rem;
    color: var(--mfr-gray-500);
}

/* ==========================================================================
   DISCUSSION / FORUM
   ========================================================================== */

.mfr-forum {
    margin: var(--space-2xl) 0;
}

.mfr-forum__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.mfr-forum__thread {
    background: var(--mfr-white);
    border: 1px solid var(--mfr-gray-200);
    border-radius: var(--border-radius);
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
    transition: border-color var(--transition-fast);
}

.mfr-forum__thread:hover {
    border-color: var(--mfr-teal-light);
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */

.mfr-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--border-radius);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.mfr-btn--primary {
    background: var(--mfr-teal);
    color: var(--mfr-white);
}

.mfr-btn--primary:hover {
    background: var(--mfr-navy);
    color: var(--mfr-white);
}

.mfr-btn--secondary {
    background: var(--mfr-gray-200);
    color: var(--mfr-gray-700);
}

.mfr-btn--secondary:hover {
    background: var(--mfr-gray-300);
}

.mfr-btn--outline {
    background: transparent;
    border: 2px solid var(--mfr-teal);
    color: var(--mfr-teal);
}

.mfr-btn--outline:hover {
    background: var(--mfr-teal);
    color: var(--mfr-white);
}

.mfr-btn--lg {
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.mfr-footer {
    background: var(--mfr-navy);
    color: rgba(255, 255, 255, 0.7);
    padding: var(--space-3xl) 0 var(--space-xl);
    margin-top: var(--space-4xl);
}

.mfr-footer a {
    color: var(--mfr-teal-light);
}

.mfr-footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-2xl);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.mfr-footer__bottom {
    max-width: var(--max-width);
    margin: var(--space-2xl) auto 0;
    padding: var(--space-lg) var(--space-xl) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.85rem;
    text-align: center;
}

/* ==========================================================================
   ADMIN: PAGE PARSER STATUS METABOX
   ========================================================================== */

.mfr-parse-status {
    padding: var(--space-md);
    border-radius: var(--border-radius);
    margin: var(--space-sm) 0;
}

.mfr-parse-status--success { background: #E8F5E9; color: #2E7D32; }
.mfr-parse-status--error { background: #FFEBEE; color: #C62828; }
.mfr-parse-status--pending { background: #FFF3E0; color: #E65100; }

/* ==========================================================================
   UTILITIES
   ========================================================================== */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-center { text-align: center; }
.text-muted { color: var(--mfr-gray-500); }
.mt-1 { margin-top: var(--space-md); }
.mt-2 { margin-top: var(--space-xl); }
.mt-3 { margin-top: var(--space-2xl); }
.mb-1 { margin-bottom: var(--space-md); }
.mb-2 { margin-bottom: var(--space-xl); }