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

/* VARIABLES */
:root {
    --dark-color: rgb(2, 4, 8);
    --dark-hover: rgba(255, 255, 255, 0.1);

    --light-color: rgb(245, 245, 245);
    --light-hover: rgba(0, 0, 0, 0.1);
}

/* GENERAL */
body {
    width: 100%;
    height: 90dvh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-family: monospace, sans-serif;
    font-size: 0.5rem;
    transition: background-color 0.3s;
}

body.light-mode {
    color: var(--dark-color);
    background-color: rgb(0 0 0);
}

body.light-mode #toggle-mode-btn:hover {
    background-color: var(--light-hover);
}

body.dark-mode {
    color: var(--light-color);
    background-color: var(--dark-color);
}

body.dark-mode #toggle-mode-btn:hover {
    background-color: var(--dark-hover);
}

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

input {
    display: none;
}

/* MAIN */
#toggle-mode-btn {
    width: 2rem;
    height: 2rem;
    position: fixed;
    top: 1rem;
    right: 1rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-size: 1rem;
    border: none;
    border-radius: 0.5rem;
    background-color: transparent;
    transition: background-color 0.3s;
    cursor: pointer;
}

#portfolio-link {
    padding-right: 0.5rem;
    position: fixed;
    right: 1rem;
    bottom: 1rem;
    font-size: 0.75rem;
}

#github-link {
    position: fixed;
    bottom: 1rem;
    left: 1rem;
}

/* RESPONSIVE WARNING */
#responsive-warning {
    width: 100%;
    height: 100%;
    padding: 2rem;
    position: fixed;
    top: 0;
    left: 0;
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    font-size: 1rem;
    text-align: center;
    z-index: 9999;
}

.warning-icons {
    font-size: 10rem;
}

@media (max-width: 768px) {
    #responsive-warning.show {
        display: flex;
    }
}

/* FLIP BOOK */
#flip_book {
   width: 700px;
    height: 503px;
    position: relative;
    transition-duration: 3s;
    perspective: 2000px;
}

.front_cover,
.back_cover {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: 2.5px 5px 5px 2.5px;
    background-image: url(./assets/images/flip_book_edge_shading.webp);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-color: rgb(220, 20, 60);
    box-shadow: 0 0 5px 0 rgb(25, 25, 25, 0.25);
}

.front_cover {
    position: absolute;
    cursor: pointer;
    transform-origin: center left;
    transition: transform 3s;
    z-index: 99;
}

.front_cover label {
    width: 100%;
    height: 100%;
    position: absolute;
    cursor: pointer;
}

.page {
    width: 700px; /* 833 - 10 padding for shadow or borders */
    height: 504px; /* 600 - 20 padding if needed */
    position: absolute;
    left: 1px;
    border-radius: 0 5px 5px 0;
    background-color: white;
    transform-origin: left;
    transform-style: preserve-3d;
    transform: rotateY(0deg);
    transition-duration: 3s;
}

.front_page {
    width: 100%;
    height: 100%;
    position: absolute;
    backface-visibility: hidden;
}

.front_page label {
    width: 100%;
    height: 100%;
    position: absolute;
    cursor: pointer;
    z-index: 100;
}

.back_page {
    width: 100%;
    height: 100%;
    position: absolute;
    backface-visibility: hidden;
    transform: rotateY(180deg);
    z-index: 100;
}

.back_page label {
    width: 100%;
    height: 100%;
    position: absolute;
    cursor: pointer;
    z-index: 100;
}

.edge_shading {
   width: 700px; /* 833 - 10 padding for shadow or borders */
    height: 504px; /* 600 - 20 padding if needed */
    position: absolute;
    z-index: 98;
}
.toolbar {
  position: sticky;
  top: 0;
  z-index: 1000;
	width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
}
/* By default: show flipbook, hide PDF */
.flipbook-container {
  display: block;
}
.pdf-container {
  display: none;
}

/* On screens smaller than 1024px (tablet & mobile): hide flipbook, show PDF */
@media screen and (max-width: 1024px) {
  .flipbook-container {
    display: none;
  }

  .pdf-container {
    display: block;
  }
}


.logo {
    height: 70px;
}

.toolbar-buttons button {
    background: none;
    border: none;
    color: white;
    font-size: 20px;
    margin-left: 15px;
    cursor: pointer;
    transition: transform 0.2s;
}

.toolbar-buttons button:hover {
    transform: scale(1.1);
}

.front_content {
   width: 700px; /* 833 - 10 padding for shadow or borders */
    height: 504px; /* 600 - 20 padding if needed */
    position: absolute;
    border-radius: 0 5px 5px 0;
    z-index: 97;
}

.back_content {
    width: 700px; /* 833 - 10 padding for shadow or borders */
    height: 504px; /* 600 - 20 padding if needed */
    position: absolute;
    top: 1px;
    left: 1px;
    border-radius: 5px 0 0 5px;
    z-index: 97;
}

.back_cover {
    position: relative;
    z-index: -1;
}

#page1 {
    z-index: 80;
}

#page2 {
    z-index: 50;
}

#page3 {
    z-index: 40;
}

#page4 {
    z-index: 30;
}

#page5 {
    z-index: 20;
}
#page6 {
    z-index: 19;
}
#page7 {
    z-index: 18;
}
#page8 {
    z-index: 17;
}
#page9 {
    z-index: 16;
}
#page10 {
    z-index: 15;
}
#page11 {
    z-index: 14;
}
#page12 {
    z-index: 13;
}
#page13 {
    z-index: 12;
}
#page14 {
    z-index: 11;
}

#page15 {
    z-index: 10;
}
#page16 {
    z-index: 9;
}
#page17 {
    z-index: 8;
}
#page18 {
    z-index: 7;
}
#page19 {
    z-index: 6;
}


#cover_checkbox:checked~#flip_book {
    transform: translateX(50%)
}

#cover_checkbox:checked~#flip_book .front_cover {
    transform: rotateY(-180deg);
    transition: transform 1.5s, z-index 0.5s 0.5s;
    z-index: 1;
}

#cover_checkbox:checked~#flip_book #cover {
  
    position: absolute;
}

#page1_checkbox:checked~#flip_book #page1 {
    transform: rotateY(-180deg);
    z-index: 30;
}

#page2_checkbox:checked~#flip_book #page2 {
    transform: rotateY(-180deg);
    z-index: 40;
}

#page3_checkbox:checked~#flip_book #page3 {
    transform: rotateY(-180deg);
    z-index: 50;
}

#page4_checkbox:checked~#flip_book #page4 {
    transform: rotateY(-180deg);
    z-index: 60;
}

#page5_checkbox:checked~#flip_book #page5 {
    transform: rotateY(-180deg);
    z-index: 90;
}

#page6_checkbox:checked~#flip_book #page6 {
    transform: rotateY(-180deg);
    z-index: 91;
}
#page7_checkbox:checked~#flip_book #page7 {
    transform: rotateY(-180deg);
    z-index: 92;
}
#page8_checkbox:checked~#flip_book #page8 {
    transform: rotateY(-180deg);
    z-index: 93;
}
#page9_checkbox:checked~#flip_book #page9 {
    transform: rotateY(-180deg);
    z-index: 94;
}
#page10_checkbox:checked~#flip_book #page10 {
    transform: rotateY(-180deg);
    z-index: 95;
}

#page11_checkbox:checked~#flip_book #page11 {
    transform: rotateY(-180deg);
    z-index: 96;
}
#page12_checkbox:checked~#flip_book #page12 {
    transform: rotateY(-180deg);
    z-index: 97;
}

#page13_checkbox:checked~#flip_book #page13 {
    transform: rotateY(-180deg);
    z-index: 98;
}

#page14_checkbox:checked~#flip_book #page14 {
    transform: rotateY(-180deg);
    z-index: 99;
}

#page15_checkbox:checked~#flip_book #page15 {
    transform: rotateY(-180deg);
    z-index: 100;
}

#page16_checkbox:checked~#flip_book #page16 {
    transform: rotateY(-180deg);
    z-index: 200;
}
#page17_checkbox:checked~#flip_book #page17 {
    transform: rotateY(-180deg);
    z-index: 210;
}
#page18_checkbox:checked~#flip_book #page18 {
    transform: rotateY(-180deg);
    z-index: 220;
}
#page19_checkbox:checked~#flip_book #page19 {
    transform: rotateY(-180deg);
    z-index: 230;
}