/* --- Variáveis e Estilos Globais --- */
:root {
    --primary-bg: #fdfdff;
    --secondary-bg: #ffffff;
    --primary-text: #2a2a2a;
    --text-muted: #5a5a5a;
    --border-color: rgba(0, 0, 0, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.08);
    --accent-color: #007aff;
    --accent-hover: #0056b3;
    --danger-color: #dc3545;
    --danger-hover-bg: #dc3545;
    --danger-hover-text: #ffffff;
    --backdrop-bg: rgba(0, 0, 0, 0.4);
    --blur-filter: blur(5px);
}

body[data-theme="dark"] {
    --primary-bg: #121212;
    --secondary-bg: #1e1e1e;
    --primary-text: #e9ecef;
    --text-muted: #adb5bd;
    --border-color: rgba(255, 255, 255, 0.15);
    --shadow-color: rgba(0, 0, 0, 0.5);
    --accent-color: #00aaff;
    --accent-hover: #0077cc;
    --danger-color: #ff4557;
    --danger-hover-bg: #ff4557;
    --danger-hover-text: #ffffff;
    --backdrop-bg: rgba(0, 0, 0, 0.6);
    --blur-filter: blur(5px);
}

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

html {
    scroll-behavior: smooth;
}

body {
    user-select: none;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    background-color: var(--primary-bg);
    color: var(--primary-text);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    width: 100%;
    transition: background-color 0.3s, color 0.3s;
}

header {
    background-color: var(--secondary-bg);
    width: 100%;
    height: 5%;
    position: fixed;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 10px var(--shadow-color);
    transition: background-color 0.3s, border-color 0.3s;
    border-radius: 0 0 30px 30px;
}

#principal-nav {
    height: 100%;
    width: 100%;
    display: flex;
    padding: 0 20px;
    visibility: hidden;
}

#principal-nav>ul {
    list-style: none;
    height: 100%;
    width: 100%;
    display: flex;
    justify-content: space-around;
    align-items: center;
    gap: 20px;
}

#principal-nav:hover .principal-a:not(:hover) {
    opacity: 0.5;
}

.principal-a {
    visibility: visible;
    position: relative;
    color: var(--primary-text);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    padding: 10px;
    transition: transform 0.3s, filter 0.3s, opacity 0.3s;
}

.principal-a::after,
.principal-a[aria-expanded="true"]::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 10px;
    height: 2px;
    width: 0;
    background-color: var(--accent-color);
    transition: width 0.3s ease-in-out;
}

.principal-a:hover,
.principal-a[aria-expanded="true"] {
    opacity: 1 !important;
    transform: translateY(-2px);
    color: var(--accent-color);
}

.principal-a:hover::after,
.principal-a[aria-expanded="true"]::after {
    width: calc(100% - 20px);
}

.dropdown-icon {
    padding: 0;
    margin-top: 5px;
    margin-left: 8px;
    font-size: 14px;
    transition: transform 0.6s;
}

.principal-a[aria-expanded="true"] .dropdown-icon {
    animation-name: bounceDown;
    animation-duration: 0.8s;
    animation-iteration-count: 1;
    transform: translateY(4px);
}


@keyframes bounceDown {
    0% {
        transform: translateY(0);
    }

    30%, 40% {
        transform: translateY(3px);
    }

    60% {
        transform: translateY(2px);
    }

    100% {
        transform: translateY(4px);
    }
}

main {
    flex-grow: 1;
    width: 100%;
    max-width: 900px;
    padding: 80px 20px 40px;
}

main p {
    line-height: 1.7;
    text-align: justify;
    color: var(--text-muted);
}

footer {
    background-color: var(--secondary-bg);
    color: var(--text-muted);
    padding: 20px;
    width: 100%;
    height: 10%;
    text-align: center;
    border-top: 1px solid var(--border-color);
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
    border-radius: 30px 30px 0 0;
}

dialog {
    background-color: var(--secondary-bg);
    color: var(--primary-text);
    border: 1px solid var(--border-color);
    padding: 30px;
    box-shadow: 0 5px 25px var(--shadow-color);
    z-index: 1001;
    border-radius: 12px;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 400px;
}

dialog::backdrop {
    background-color: var(--backdrop-bg);
    backdrop-filter: blur(3px);
}

dialog h2,
#account-dialog h2 {
    text-align: center;
    margin-bottom: 20px;
}

.close-button {
    color: var(--text-muted);
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: transparent;
    border: none;
    font-weight: bold;
    cursor: pointer;
    padding: 2px 5px 5px 5px;
    font-size: 30px;
    line-height: 1;
    border-radius: 20%;
    transition: all 0.3s;
}

.close-button:hover {
    color: var(--danger-hover-text);
    background-color: var(--danger-hover-bg);
}

.close-button:focus {
    outline: none;
    font-size: 35px;
    opacity: 0.2;
}

#account-li {
    position: relative;
}

#account-dialog {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 10px;
    width: 250px;
    padding: 20px;
    background-color: var(--secondary-bg);
    color: var(--primary-text);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 5px 25px var(--shadow-color);
    z-index: 101;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.5s ease, transform 0.5s ease, visibility 0s 0.5s;
}

#account-dialog.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition: opacity 0.5s ease, transform 0.5s ease, visibility 0s 0s;
}

#account-dialog form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

#account-dialog .account-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 10px;
}

#account-dialog form select {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--primary-bg);
    color: var(--primary-text);
    font-size: 16px;
    width: 150px;
    transition: 0.3s;
}

#account-dialog form select:hover,
#account-dialog form select:focus {
    outline: none;
    border-color: var(--accent-color);
}

#account-dialog form button,
dialog form button {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: 0.3s;
}

#account-dialog form .save-button,
dialog form .save-button {
    background-color: var(--accent-color);
    color: #ffffff;
}

#account-dialog form .save-button:hover,
dialog form .save-button:hover {
    background-color: var(--accent-hover);
}

.about {
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

/* Theme switch */
.container-theme {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
    width: 100%;
    justify-content: center;
    color: var(--primary-text);
}
.switch {
    position: relative;
    display: inline-block;
    width: 70px;
    height: 34px;
}

.toggle {
    display: none;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #00ddff;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    background-color: yellow;
    box-shadow: 0px 2px 5px 0px rgba(0, 0, 0, 0.3);
    border-radius: 50%;
    position: absolute;
    z-index: 1001;
    content: "";
    top: 3px;
    height: 27px;
    width: 27px;
    left: 4px;
    transition: all 0.3s;
}

.toggle:checked+.slider {
    background-color: #383838;
}

.toggle:checked+.slider:before {
    transform: translateX(36px);
    background-color: rgb(115, 115, 115);
    box-shadow: 0px 2px 5px 0px rgba(255, 255, 255, 0.3);
}

.slider i {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 20px;
}

#sun {
    right: 8px;
    color: yellow;
}

#moon {
    left: 10px;
    color: white;
    opacity: 0.5;
}

.text-placeholder-div {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    width: 100%;
    
}

.label-placeholder {
    position: absolute;
    left: 25px;
    color: var(--text-muted);
    transition: all 0.3s ease-in-out;
}

.custom-input {
    
    background-color: var(--primary-bg);
    color: var(--primary-text);
    border: 1px solid var(--border-color);
    font-size: 14px;
    border-radius: 5px;
    transition: border-color 0.3s, font-size 0.3s;
}

.custom-input:focus {
    outline: none;
    border-color: var(--accent-color);
    font-size: 16px;
}
.custom-input::placeholder {
    color: var(--text-muted);
}




input[type="text"], input[type="email"], input[type="password"] {
    background-color: var(--primary-bg);
    color: var(--primary-text);
    border: 1px solid var(--border-color);
    font-size: 14px;
    border-radius: 5px;
    padding: 5px;
    transition: border-color 0.3s, font-size 0.3s;
}

input[type="text"]:focus, input[type="email"]:focus, input[type="password"]:focus {
    outline: none;
    border-color: var(--accent-color);
    font-size: 16px;
}

span {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 10px;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s;
}