@import url('https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300..800;1,300..800&family=Space+Mono:ital,wght@0,400;0,700;1,400;1,700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=University&display=swap');

/* ==========================
   Cursor personalizado
========================== */
body {
    cursor: url("cursor_small.png") 16 16, auto;
}

a, button {
    cursor: url("cursor_small.png") 16 16, pointer;
}

/* ==========================
   Scroll y fondo
========================== */
html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 2em;
    background: linear-gradient(135deg, red, blue);
    background-size: 400% 400%;
    animation: gradientBG 10s ease infinite alternate;
    font-family: 'Open Sans', sans-serif;
    color: #fff;
    position: relative;
    overflow-x: hidden;
}

/* ==========================
   Figuras geométricas animadas en el fondo
========================== */
body::before,
body::after {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(255,255,255,0.08) 2px, transparent 0),
        radial-gradient(circle at 80% 70%, rgba(255,255,255,0.06) 3px, transparent 0),
        linear-gradient(transparent 96%, rgba(255,255,255,0.05) 97%),
        linear-gradient(90deg, transparent 96%, rgba(255,255,255,0.05) 97%);
    background-size: 120px 120px, 200px 200px, 40px 40px, 40px 40px;
    z-index: 0;
}

body::before {
    animation: floatShapes 40s linear infinite alternate;
}

body::after {
    animation: floatShapesReverse 60s linear infinite alternate;
    opacity: 0.7;
}

/* Animaciones de las formas */
@keyframes floatShapes {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(25px, -35px) scale(1.05); }
    100% { transform: translate(-25px, 35px) scale(1); }
}

@keyframes floatShapesReverse {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-30px, 25px) scale(1.08); }
    100% { transform: translate(30px, -25px) scale(1); }
}

/* Fondo degradado animado */
@keyframes gradientBG {
    0%   { background-position: 0% 50%; }
    25%  { background-position: 50% 100%; }
    50%  { background-position: 100% 50%; }
    75%  { background-position: 50% 0%; }
    100% { background-position: 0% 50%; }
}

/* ==========================
   Estrellas doradas fijas
========================== */
.estrella {
    position: fixed;
    font-size: 24px;
    color: yellow;
    background: rgba(0,0,0,0.2); /* recuadro semitransparente */
    padding: 4px 6px;
    border-radius: 6px;
    z-index: 20;
    pointer-events: none;
}

.estrella-left {
    top: 20%;
    left: 10px;
}

.estrella-right {
    top: 70%;
    right: 10px;
}

/* ==========================
   Letras 'U' grandes en el fondo
========================== */
.letterU {
    position: fixed;
    font-family: 'University', monospace;
    color: rgba(255, 255, 255, 0.05);
    pointer-events: none;
    z-index: 0;
    animation: floatU 50s linear infinite alternate;
}

/* Distribución y tamaños variados de las 'U' */
.letterU:nth-child(1) { top: 5%; left: 10%; font-size: 180px; transform: rotate(-10deg); }
.letterU:nth-child(2) { top: 25%; left: 70%; font-size: 220px; transform: rotate(15deg); }
.letterU:nth-child(3) { top: 50%; left: 30%; font-size: 200px; transform: rotate(-20deg); }
.letterU:nth-child(4) { top: 75%; left: 50%; font-size: 240px; transform: rotate(5deg); }
.letterU:nth-child(5) { top: 60%; left: 80%; font-size: 180px; transform: rotate(-15deg); }

/* Animación sutil de movimiento */
@keyframes floatU {
    0%   { transform: translate(0, 0) rotate(var(--rotate, 0deg)); }
    50%  { transform: translate(20px, -30px) rotate(calc(var(--rotate, 0deg) + 5deg)); }
    100% { transform: translate(-20px, 30px) rotate(var(--rotate, 0deg)); }
}

/* ==========================
   Tipografía y títulos
========================== */
h1, h2 {
    font-family: 'Space Mono', monospace;
    text-align: center;
    color: #fff;
}

h3 {
    text-align: center;
    color: #fff;
}

/* ==========================
   Intro y botones
========================== */
.intro {
    text-align: left;
    max-width: 800px;
    margin: 0 auto 2em auto;
}

.intro h2 {
    text-align: left;
    font-size: 1.8em;
}

.intro p {
    line-height: 1.6;
}

.intro a {
    display: flex;
    justify-content: center;
}

.intro button {
    font-family: 'Space Mono', monospace;
    font-size: 1em;
    padding: 15px 45px;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    background: linear-gradient(90deg, red, blue);
    background-size: 300% 300%;
    color: white;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.3);
    transition: all 0.4s ease;
}

/* ==========================
   Galería
========================== */
.galeria {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5em;
    margin-top: 2em;
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
}

.tarjeta {
    position: relative;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 1/1;
    width: 200px;
    height: 200px;
    margin: 0 auto;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.tarjeta img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.tarjeta h3 {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    margin: 0;
    padding: 6px 12px;
    border-radius: 6px;
    background: rgba(0, 0, 0, 0.6);
    font-size: 0.9em;
    color: white;
}

.tarjeta:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.5);
}

/* ==========================
   Responsive
========================== */
@media (max-width: 1200px) {
    .galeria { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 900px) {
    .galeria { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
    .galeria { grid-template-columns: 1fr; }
    .tarjeta { width: 100%; height: auto; }
}