/* ==========================================================================
   Estilos Personalizados - Academia Mr. Matemático
   ========================================================================== */

/* ============================================================
   LOADING SCREEN
   ============================================================ */
#loading-screen {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: #12151a;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

#loading-screen.hide {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loading-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: loadingPulse 1.2s ease-in-out infinite alternate;
}

.loading-logo .logo-icon {
    font-size: 3rem;
    color: #ffc107;
    filter: drop-shadow(0 0 18px rgba(255, 193, 7, 0.7));
    animation: logoSpin 2s ease-in-out infinite;
}

.loading-logo .logo-text {
    font-family: 'Outfit', sans-serif;
    font-size: 1.8rem;
    font-weight: 800;
    color: #ffc107;
    letter-spacing: 0.05em;
}

.loading-math-symbols {
    display: flex;
    gap: 1.4rem;
    font-size: 1.4rem;
    color: rgba(255, 193, 7, 0.5);
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
}

.loading-math-symbols span {
    animation: symbolBounce 1.4s ease-in-out infinite;
}
.loading-math-symbols span:nth-child(1) { animation-delay: 0s; }
.loading-math-symbols span:nth-child(2) { animation-delay: 0.2s; }
.loading-math-symbols span:nth-child(3) { animation-delay: 0.4s; }
.loading-math-symbols span:nth-child(4) { animation-delay: 0.6s; }
.loading-math-symbols span:nth-child(5) { animation-delay: 0.8s; }

.loading-bar-wrap {
    width: 200px;
    height: 4px;
    background: rgba(255,255,255,0.1);
    border-radius: 99px;
    overflow: hidden;
}

.loading-bar {
    height: 100%;
    background: linear-gradient(90deg, #ffc107, #ff9800);
    border-radius: 99px;
    animation: loadingBar 1.8s ease-in-out infinite;
}

@keyframes loadingPulse {
    from { transform: scale(1); }
    to   { transform: scale(1.04); }
}

@keyframes logoSpin {
    0%   { transform: rotate(0deg) scale(1); }
    25%  { transform: rotate(-10deg) scale(1.05); }
    75%  { transform: rotate(10deg) scale(1.05); }
    100% { transform: rotate(0deg) scale(1); }
}

@keyframes symbolBounce {
    0%, 100% { transform: translateY(0);    opacity: 0.4; }
    50%       { transform: translateY(-8px); opacity: 1;   }
}

@keyframes loadingBar {
    0%   { width: 0%;   margin-left: 0; }
    50%  { width: 70%;  margin-left: 0; }
    100% { width: 0%;   margin-left: 100%; }
}

:root {
    --mr-yellow: #ffc107;
    --mr-yellow-hover: #e0a800;
    --mr-yellow-glow: rgba(255, 193, 7, 0.25);
    --mr-dark-bg: #12151a;
    --mr-dark-surface: #1e2229;
    --mr-slate-bg: #2b3035;
    --mr-text-light: #f8f9fa;
    --mr-text-muted: #9ba3af;
    --mr-border-color: rgba(255, 255, 255, 0.1);
    --mr-radius-sm: 8px;
    --mr-radius-md: 14px;
    --mr-radius-lg: 20px;
    --mr-shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
    --mr-shadow-md: 0 8px 24px rgba(0, 0, 0, 0.1);
    --mr-shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    color: #2b303a;
    background-color: #f6f8fb;
    -webkit-font-smoothing: antialiased;
}

/* 1. Navbar & Hero Section */
.navbar {
    background-color: var(--mr-dark-bg) !important;
    border-bottom: 1px solid var(--mr-border-color);
}

.hero-section {
    background: linear-gradient(135deg, var(--mr-dark-bg) 0%, #1a202c 100%);
    padding: 4.5rem 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, var(--mr-yellow-glow) 0%, rgba(255, 193, 7, 0) 70%);
    pointer-events: none;
    animation: glowPulse 4s ease-in-out infinite alternate;
}

.hero-section::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
    pointer-events: none;
    animation: glowPulse 5s ease-in-out infinite alternate-reverse;
}

@keyframes glowPulse {
    from { opacity: 0.6; transform: scale(1); }
    to   { opacity: 1;   transform: scale(1.15); }
}

/* ---- Floating math particles ---- */
.hero-particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}

.math-particle {
    position: absolute;
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    color: rgba(255, 193, 7, 0.08);
    user-select: none;
    animation: floatUp linear infinite;
}

@keyframes floatUp {
    0%   { transform: translateY(110%) rotate(0deg);   opacity: 0; }
    10%  { opacity: 1; }
    90%  { opacity: 1; }
    100% { transform: translateY(-110%) rotate(360deg); opacity: 0; }
}

/* ---- Hero content entry animations ---- */
.hero-badge-anim   { animation: fadeSlideUp 0.7s ease both; animation-delay: 0.2s; }
.hero-title-anim   { animation: fadeSlideUp 0.7s ease both; animation-delay: 0.4s; }
.hero-lead-anim    { animation: fadeSlideUp 0.7s ease both; animation-delay: 0.55s; }
.hero-icons-anim   { animation: fadeSlideUp 0.7s ease both; animation-delay: 0.7s; }
.hero-btns-anim    { animation: fadeSlideUp 0.7s ease both; animation-delay: 0.85s; }
.hero-carousel-anim { animation: fadeSlideRight 0.9s ease both; animation-delay: 0.5s; }

@keyframes fadeSlideUp {
    from { opacity: 0; transform: translateY(28px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeSlideRight {
    from { opacity: 0; transform: translateX(40px); }
    to   { opacity: 1; transform: translateX(0); }
}

/* ---- Scroll-reveal sections ---- */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal-on-scroll.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* 2. Botones & Badges */
.btn-warning {
    background-color: var(--mr-yellow);
    border-color: var(--mr-yellow);
    color: #000 !important;
    font-weight: 700;
    transition: all 0.25s ease;
}

.btn-warning:hover {
    background-color: var(--mr-yellow-hover);
    border-color: var(--mr-yellow-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--mr-yellow-glow);
}

.btn-dark {
    background-color: #1a1e24;
    border-color: #1a1e24;
    transition: all 0.25s ease;
}

.btn-dark:hover {
    background-color: #2d333b;
    border-color: #2d333b;
    transform: translateY(-2px);
}

/* 3. Tarjetas de Cursos y Niveles */
.course-card, .level-card {
    transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1), box-shadow 0.3s ease;
    border: none;
    border-radius: var(--mr-radius-md);
}

.course-card:hover, .level-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0,0,0,0.12) !important;
}

.course-card .card-img-top {
    transition: transform 0.4s ease;
}

.course-card:hover .card-img-top {
    transform: scale(1.05);
}

/* ---- Carousel: wider & better image framing ---- */
#carouselMrMatematico {
    border-radius: 20px !important;
}

.carousel-inner {
    border-radius: 20px;
}

.carousel-item img {
    object-fit: cover;
    object-position: top center !important;
    width: 100%;
    height: 100%;
    display: block;
}

/* 4. Aula Virtual y Reproductor */
#video-reproductor {
    border: none;
    width: 100%;
    height: 100%;
    border-radius: var(--mr-radius-md);
}

.list-group-item-action {
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

/* 5. Cuestionarios y Evaluaciones */
.question-card {
    border: 1px solid #e2e8f0;
    transition: border-color 0.2s ease;
}

.question-card:hover {
    border-color: #cbd5e1;
}

.option-label {
    transition: all 0.2s ease;
}

.option-label:hover {
    background-color: #fffbeb !important;
    border-color: #fde68a !important;
}

/* 6. Utilidades Generales */
.w-fit-content {
    width: fit-content;
}

.font-outfit {
    font-family: 'Outfit', sans-serif;
}

/* ---- Stagger delay for level cards ---- */
.level-card-wrap:nth-child(1) { animation-delay: 0.1s; }
.level-card-wrap:nth-child(2) { animation-delay: 0.2s; }
.level-card-wrap:nth-child(3) { animation-delay: 0.3s; }
.level-card-wrap:nth-child(4) { animation-delay: 0.4s; }

/* ---- Course banner placeholder ---- */
.course-banner {
    transition: filter 0.3s ease, transform 0.3s ease;
}

.course-card:hover .course-banner {
    filter: brightness(1.12);
    transform: scale(1.03);
}