:root {
    --bg-color: #f4f4f4;
    --text-color: #333;
    --header-bg: #0d21ff;
    --header-text: #ffffff;
    --primary-btn-bg: #0d21ff;
    --primary-btn-text: #ffffff;
    --primary-btn-border: #0d21ff;
    --primary-btn-hover-bg: #0b1ccc;
    --primary-btn-hover-text: #e7ff2fdb;
    --secondary-btn-bg: #ffffff;
    --secondary-btn-text: #0d21ff;
    --secondary-btn-border: #ffffff;
    --secondary-btn-hover-bg: #f0f0f0;
    --secondary-btn-hover-text: #0b1ccc;
    --main-content-bg: #ffffffb6;
    --main-content-text: #2c3e50;
    --main-content-shadow: #888888;
    --footer-bg: #b1b5b9;
    --footer-text: #232525;
    --cta-btn-bg: #16c9b4;
    --cta-btn-text: #ffffff;
    --cta-btn-hover-bg: #14B8A6;
    --modal-bg: #fff;
    --modal-text: #333;
    --modal-label: #333;
    --modal-input-bg: #fff;
    --modal-input-border: #ccc;
    --modal-input-text: #333;
    --modal-submit-bg: #3F97EF;
    --modal-submit-text: #fff;
    --modal-boarder-color: #ccc;
    --subject-list-text: #0b1ccc;
    --subject-list-bg: #e7f3ff;
    --subject-list-slected: #d2e6f7f8;
    --latex-help-link: #0d21ff;
    --delete-usr-btn-text: #ffffff;
    --delete-usr-btn-hover: #ff4949;
    --delete-usr-btn: #ff0000;


}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --header-bg: #1f2937;
    --header-text: #e0e0e0;
    --primary-btn-bg: #3b82f6;
    --primary-btn-text: #ffffff;
    --primary-btn-border: #3b82f6;
    --primary-btn-hover-bg: #2563eb;
    --primary-btn-hover-text: #f0f0f0;
    --secondary-btn-bg: #4b5563;
    --secondary-btn-text: #e0e0e0;
    --secondary-btn-border: #4b5563;
    --secondary-btn-hover-bg: #6b7280;
    --secondary-btn-hover-text: #ffffff;
    --main-content-bg: #2d3748;
    --main-content-text: #e0e0e0;
    --main-content-shadow: rgba(255,255,255,0.05);
    --footer-bg: #1f2937;
    --footer-text: #9ca3af;
    --cta-btn-bg: #14B8A6;
    --cta-btn-text: #ffffff;
    --cta-btn-hover-bg: #0F766E;
    --modal-bg: #2d3748;
    --modal-text: #e0e0e0;
    --modal-label: #e0e0e0;
    --modal-input-bg: #4b5563;
    --modal-input-border: #6b7280;
    --modal-input-text: #e0e0e0;
    --modal-submit-bg: #3b82f6;
    --modal-submit-text: #ffffff;
    --modal-boarder-color: #6b7280;
    --subject-list-text: #9bb4ff;
    --subject-list-bg: #1a2035;
    --subject-list-slected: #3a486b;
    --latex-help-link: #6f94e2;
    --delete-usr-btn-text: #ffffff;
    --delete-usr-btn-hover: #ff0000;
    --delete-usr-btn: #ff4949;

}

html {
    height: 100%;
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: Arial, Helvetica, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

*, *:before, *:after {
    box-sizing: inherit;
}

.site-header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    flex-shrink: 0;
}
.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
}


.logo {
    font-weight: bold;
    font-size: 1.5rem;
}

.nav-menu-container { 
    display: block; 
}

.nav-menu {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    align-items: center;
}

.nav-dark-mode-toggle {
    background: none;
    border: none;
    color: var(--header-text);
    cursor: pointer;
    font-size: 1.5rem;
    padding: 0 0.5rem;
    margin-left: 1rem;
}

.nav-item {
    margin-left: 1.5rem;
}

.nav-item:first-child {
    margin-left: 0;
}

.nav-link {
    color: var(--edit-usr-btn);
    text-decoration: none;
    padding: 0.5rem 0;
    transition: color 0.3s ease, background-color 0.3s ease;
    display: inline-block;
    border-radius: 4px;
}
 
.nav-link:hover {
    color: var(--delete-usr-btn);
}

.nav-button:not(.nav-button-secondary) {
    background-color: var(--primary-btn-bg);
    color: var(--primary-btn-text);
    border: 1px solid var(--primary-btn-border);
    font-weight: bold;
    border-radius: 5px;
    padding-top: 0px;
    padding-right: 10px;
    padding-bottom: 0px;
    padding-left: 10px;
}

.nav-button:not(.nav-button-secondary):hover {
    background-color: var(--primary-btn-hover-bg);
    color: var(--primary-btn-hover-text);
    border-color: var(--primary-btn-hover-bg);
}

.nav-button.nav-button-secondary {
    background-color: var(--secondary-btn-bg);
    color: var(--secondary-btn-text);
    border: 1px solid var(--secondary-btn-border);
    font-weight: bold;
    border-radius: 5px;
    padding-top: 2px;
    padding-right: 10px;
    padding-bottom: 2px;
    padding-left: 10px;
}
.nav-button.nav-button-secondary:hover {
    background-color: var(--secondary-btn-hover-bg);
    color: var(--secondary-btn-hover-text);
    border-color: var(--secondary-btn-hover-bg);
}
.main-content {
    flex-grow: 1;
    padding: 2rem;
    max-width: 1100px;
    width: 100%;
    margin: 2rem auto;
    background-color: var(--main-content-bg);
    border-radius: 8px;
    box-shadow: 0 1px 3px var(--main-content-shadow);
}
.main-button {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0px 0px 20px 0px;
}

.wrapper {
    /* width: 900px; */
    margin: 0 auto;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--main-content-shadow);
}

.wrapper2 {
    /* width: 750px; */
    margin: 0 auto;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--main-content-shadow);
}

.wrapper3 {
    /* width: 500px; */
    margin: 0 auto;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--main-content-shadow);
}

.main-content h1 {
    color: var(--main-content-text);
    margin-top: 0;
    margin-bottom: 1rem;
    text-align: center;
}

.main-content p {
    color: var(--main-content-text);
    margin-top: 0;
    margin-bottom: 1rem;
}

.main-button {
    display: flex;
    justify-content: center;
    align-items: center;
}

.cta-btn {
    padding: 12px 30px;
    font-size: 1.2rem;
    outline: none;
    border: none;
    background-color: var(--cta-btn-bg);
    color: var(--cta-btn-text);
    cursor: pointer;
    border-radius: 5px;
}

.cta-btn:hover {
    background-color: var(--cta-btn-hover-bg);
}
.modal-container {
    background-color: rgba(0, 0, 0, 0.6);
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}
  
.modal {
    background: var(--modal-bg);
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
    position: absolute;
    overflow: hidden;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 100%;
    width: 400px;
}
  
.modal-content {
    padding: 20px;
    color: var(--modal-text);
    max-height: 80vh;
    overflow-y: auto;
}
  
.modal-form label {
    display: block;
    color: var(--modal-label);
    margin-bottom: 6px;
    font-weight: bold;
}

.modal-form .form-input {
    padding: 8px;
    background-color: var(--modal-input-bg); 
    border: 1px solid var(--modal-input-border); 
    color: var(--modal-input-text);
    width: 325px; 
    border-radius: 6px; 
    box-sizing: border-box; 
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 25px;
    position: absolute;
    top: 5px;
    right: 12px;
    cursor: pointer;
}

.submit-btn {
    padding: 10px 30px;
    font-weight: bold;
    background: var(--primary-btn-bg);
    color: var(--primary-btn-text);
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.submit-btn:hover {
    background-color: var(--primary-btn-hover-bg);
    color: var(--primary-btn-hover-text);
}

.modal-container .submit-btn {
    padding: 10px 30px;
    font-weight: bold;
    background: var(--modal-submit-bg);
    border: none;
    color: var(--modal-submit-text);
    cursor: pointer;
    border-radius: 5px;
}
  
.modal-container.show-modal {
    display: block;
}

.pw-field {
    display: flex;
    position: relative;
    align-items: center;
}
 
.pw-field input {
    margin-bottom: 10px;
}

.pw-field img {
    width: 20px; 
    height: 20px; 
    /* position: absolute; */
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
}
.site-footer {
    background-color: var(--footer-bg);
    color: var(--footer-text); 
    text-align: center; 
    padding: 1.5rem; 
    flex-shrink: 0; 
}
.site-footer p {
    margin: 0;
}

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

.dashboard-button {
    display: inline-block;
    padding: 8px 15px;
    margin: 5px 0;
    font-size: 0.95em;
    color: white;
    background-color: #007bff;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    cursor: pointer;
    text-align: center;
    width: auto;
    min-width: 180px;
}
.dashboard-button:hover {
    background-color: #0056b3;
}

.dashboard-item-list {
    list-style-type: none;
    padding-left: 0;
    margin-top: 10px;
    color: var(--dashboard-box-text); 
}

.dashboard-item-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;          
    padding: 8px 0;                
    border-bottom: 1px solid #dddddd;
}

.dashboard-item-list li:last-child {
    border-bottom: none;
}

.dashboard-item-list li span {
    margin-right: 15px;
}

.mobile-nav-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--header-text);
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.mobile-nav-toggle .icon-bar {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--header-text);
    margin: 4px 0;
    transition: all 0.3s ease-in-out;
}

@media (max-width: 613px) {
    .site-header {
        padding: 1rem;
    }

    .main-nav {
        flex-direction: column;
        align-items: center;
    }

    .logo {
        margin-bottom: 1rem;
    }

    .nav-menu-container {
        width: 100%;
    }

    .nav-menu {
        flex-direction: column;
        align-items: center;
        width: 100%;
    }

    .nav-item {
        margin-left: 0; 
        margin-bottom: 0.5rem; 
        width: 90%; 
        max-width: 300px; 
    }

    .nav-item:last-child {
        margin-bottom: 0;
    }

    .nav-link.nav-button,
    .nav-button.nav-button-secondary {
        display: block;
        width: 100%;
        text-align: center;
        padding-top: 0.5rem;
        padding-bottom: 0.5rem;
        box-sizing: border-box; 
    }

    .main-content {
        padding: 1rem; 
        margin: 1rem auto;
    }

    .wrapper2 { 
        width: 90%; 
        max-width: 750px;
    }

    .main-content h1 {
        font-size: 1.8rem;
    }

    .modal {
        width: 90%; 
        max-width: 500px; 
    }

    .modal-form .form-input {
        width: 100%;
    }

    .pw-field img {
        right: 15px;
    }

    .site-footer {
        padding: 1rem;
    }

    .main-content p {
        font-size: 0.9rem;
    }

    .cta-btn {
        padding: 10px 20px;
        font-size: 1rem;
    }

    .site-header {
        position: relative;
    }

    .main-nav {
        flex-direction: row;
        justify-content: space-between;
    }

    .mobile-nav-toggle {
        display: block;
        margin-left: auto;
    }
    .mobile-nav-toggle.active .icon-bar:nth-child(1) {
        transform: translateY(6px) rotate(45deg);
    }
    .mobile-nav-toggle.active .icon-bar:nth-child(2) {
        opacity: 0;
    }
    .mobile-nav-toggle.active .icon-bar:nth-child(3) {
        transform: translateY(-6px) rotate(-45deg);
    }

    .nav-menu-container {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--header-bg);
        box-shadow: 0 3px 5px rgba(0,0,0,0.15);
        z-index: 1000;
        padding-top: 0.5rem;
        padding-bottom: 0.5rem;
    }

    .nav-menu-container.nav-open-mobile {
        display: flex;
    }

    .nav-menu {
        align-items: flex-start;
    }

    .nav-item {
        width: 100%;
        margin-bottom: 0; 
        text-align: left;
    }

    .nav-link { 
        display: block; 
        padding: 0.75rem 1.5rem; 
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .nav-item:last-child .nav-link {
        border-bottom: none;
    }

    .nav-link.nav-button,
    .nav-button.nav-button-secondary {
        width: calc(100% - 3rem);
        margin: 0.5rem 1.5rem;
        text-align: center;
        padding-top: 0.75rem;
        padding-bottom: 0.75rem;
        border-bottom: none;
    }
}

.open-latex-help-trigger {
    color: var(--primary-btn-border);
}

.latex-help-content {
    display: none; 
    position: fixed; 
    top: 50%; 
    left: 50%; 
    transform: translate(-50%, -50%); 
    background: var(--modal-input-bg); 
    padding: 25px; 
    border: 1px solid var(--modal-boarder-color); 
    box-shadow: 0 4px 8px rgba(0,0,0,0.2); 
    z-index: 1002; 
    max-width: 500px; 
    border-radius: 8px; 
    max-height: 80vh; 
    overflow-y: auto;
}

.latex-help-link {
    color: var(--primary-btn-text) ;
    background-color: var(--primary-btn-bg);
    padding: 8px;
    border-radius: 5px;
    border: 1px solid var(--primary-btn-border);
}

.normal-text {
    font-weight: normal;
    font-size: x-small;
}

/* added moblie menu css styling */
.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    position: relative;
}

.logo a {
    font-weight: bold;
    font-size: 1.5em;
    text-decoration: none;
}

.mobile-nav-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1001;
}

.mobile-nav-toggle .icon-bar {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--bg-color);
    margin: 4px 0;
    transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out;
}

.mobile-nav-toggle[aria-expanded="true"] .icon-bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}
.mobile-nav-toggle[aria-expanded="true"] .icon-bar:nth-child(2) {
    opacity: 0;
}
.mobile-nav-toggle[aria-expanded="true"] .icon-bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

.nav-menu-container {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--header-bg);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.nav-menu-container.nav-menu-container-active {
    display: flex;
}

.nav-menu {
    list-style: none;
    padding: 0;
    margin: 0;
    width: 100%;
}

.nav-menu .nav-item {
    width: 100%;
}

.nav-menu .nav-link {
    display: block;
    padding: 12px 20px;
    text-decoration: none;
}

@media (min-width: 769px) {
    .mobile-nav-toggle {
        display: none;
    }

    .nav-menu-container {
        display: flex;
        flex-direction: row;
        position: static;
        width: auto;
        background-color: transparent;
        box-shadow: none;
    }

    .nav-menu {
        flex-direction: row;
    }

    .nav-menu .nav-item {
        width: auto;
        margin-left: 1rem;
    }
    .nav-menu .nav-item:first-child {
        margin-left: 0;
    }

    .nav-menu .nav-link {
        padding: 10px 15px;
    }

    .nav-button-delete {
        background-color: var(--delete-usr-btn);
        color: var(--delete-usr-btn-text);
    }
    .nav-button-delete:hover {
        background-color: var(--delete-usr-btn-hover);
    }
}