/* Siena College Brand Colors */
:root {
    --siena-green: #006341;
    --siena-gold: #fbb040;
    --siena-dark-green: #003d25;
    --siena-light-green: #3ac569;
    --siena-tan: #e7e2d6;
    --siena-gray: #b6b1a9;
    --white: #fff;
    --black: #222;
    --background-color: var(--siena-tan);
    --text-color: var(--siena-dark-green);
    --card-bg: var(--white);
    --card-border: var(--siena-gray);
    --nav-bg: var(--siena-green);
    --nav-link: var(--white);
    --nav-link-hover: var(--siena-gold);
    --footer-bg: var(--siena-green);
    --footer-text: var(--white);
    --button-bg: var(--siena-gold);
    --button-text: var(--siena-dark-green);
    --button-hover-bg: var(--siena-light-green);
    --button-hover-text: var(--siena-dark-green);
    --toggle-bg: var(--siena-gray);
    --toggle-active: var(--siena-gold);
    --toggle-circle: var(--white);
    --dropdown-bg: var(--siena-green);
    --dropdown-link-hover: var(--siena-light-green);
}

[data-theme="dark"] {
    --background-color: var(--siena-dark-green);
    --text-color: var(--siena-tan);
    --card-bg: #26322e;
    --card-border: #46554c;
    --nav-bg: #00291a;
    --nav-link: var(--siena-gold);
    --nav-link-hover: var(--white);
    --footer-bg: #00291a;
    --footer-text: var(--siena-gold);
    --button-bg: var(--siena-gold);
    --button-text: var(--siena-dark-green);
    --button-hover-bg: var(--siena-light-green);
    --button-hover-text: var(--siena-dark-green);
    --toggle-bg: #46554c;
    --toggle-active: var(--siena-gold);
    --toggle-circle: var(--siena-dark-green);
    --dropdown-bg: #153c2b;
    --dropdown-link-hover: var(--siena-gold);
}

/* General Styles */
body {
    font-family: 'Segoe UI', 'Arial', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background 0.4s, color 0.4s;
}

header {
    background: var(--nav-bg);
    color: var(--nav-link);
    padding: 1.5rem 2rem 1rem 2rem;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    border-bottom: 4px solid var(--siena-gold);
    position: relative;
}

header h1 {
    margin: 0;
    font-size: 2.2rem;
    letter-spacing: 2px;
    font-weight: 700;
    text-shadow: 1px 1px 3px rgba(0,99,65,0.08);
    flex: 1;
}

/* Navigation Styles */
nav {
    background: var(--nav-bg);
    color: var(--nav-link);
    padding: 0.5rem 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 1px 5px rgba(0,0,0,0.04);
}

nav a, nav .dropdown > a {
    color: var(--nav-link);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-weight: 600;
    transition: background 0.2s, color 0.2s;
    position: relative;
    display: inline-block;
}

nav a:hover, nav .dropdown:hover > a {
    background: var(--nav-link-hover);
    color: var(--siena-dark-green);
}

nav .dropdown {
    position: relative;
}

nav .dropdown-content {
    display: none;
    position: absolute;
    left: 0;
    background: var(--dropdown-bg);
    min-width: 180px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.12);
    z-index: 2;
    border-radius: 0 0 6px 6px;
    margin-top: 2px;
    overflow: hidden;
}

nav .dropdown-content a {
    color: var(--nav-link);
    padding: 0.8rem 1.2rem;
    display: block;
    transition: background 0.2s, color 0.2s;
}

nav .dropdown-content a:hover {
    background: var(--dropdown-link-hover);
    color: var(--siena-dark-green);
}

nav .dropdown:hover .dropdown-content {
    display: block;
}

/* Main Content Styles */
main {
    padding: 2.5rem 3vw 2rem 3vw;
    flex: 1;
    max-width: 820px;
    margin: 0 auto;
    width: 100%;
}

main h2 {
    background: var(--card-bg);
    color: var(--siena-green);
    font-size: 1.7rem;
    margin-bottom: 1.2rem;
    padding: 1rem 1.5rem;
    border-radius: 8px 8px 0 0;
    border: 1px solid var(--card-border);
    border-bottom: none;
    letter-spacing: 1px;
    font-weight: 700;
}

main p, section, form, fieldset, label {
    background: var(--card-bg);
    color: var(--text-color);
    padding: 1rem 1.5rem;
    margin-bottom: 1.2rem;
    border: 1px solid var(--card-border);
    border-radius: 0 0 8px 8px;
    font-size: 1.08rem;
}

main p {
    border-radius: 8px;
}

section {
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}

fieldset {
    border: 1.5px solid var(--siena-gray);
    border-radius: 6px;
    margin-bottom: 1rem;
}

legend {
    background: var(--siena-gold);
    color: var(--siena-dark-green);
    font-weight: 600;
    padding: 0.2rem 0.9rem;
    border-radius: 4px;
    margin-left: 0.5rem;
    letter-spacing: 1px;
}

label {
    display: block;
    margin: 0.7em 0 0.3em 0;
    font-weight: 500;
    background: none;
    border: none;
    padding: 0;
}

input[type="number"], input[type="text"] {
    border: 1px solid var(--siena-gray);
    border-radius: 4px;
    padding: 0.35rem 0.7rem;
    background: var(--background-color);
    color: var(--text-color);
    font-size: 1rem;
    margin-left: 0.3rem;
    margin-right: 0.8rem;
    transition: border 0.2s;
}
input[type="number"]:focus, input[type="text"]:focus {
    border: 1.5px solid var(--siena-green);
    outline: none;
}

/* Theme Toggle Button */
.theme-toggle {
    position: absolute;
    top: 1.3rem;
    right: 2.2rem;
    background: var(--button-bg);
    color: var(--button-text);
    border: none;
    padding: 0.5rem 1.2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
    transition: background 0.2s, color 0.2s;
    z-index: 10;
}

.theme-toggle:hover {
    background: var(--button-hover-bg);
    color: var(--button-hover-text);
    outline: 2px solid var(--siena-gold);
}

/* Toggle Switch Styles */
.toggle-container {
    display: flex;
    align-items: center;
    margin: 10px 0;
    gap: 12px;
}

.toggle-label {
    margin-right: 8px;
    font-weight: 500;
}

.toggle-switch {
    position: relative;
    width: 50px;
    height: 26px;
    background-color: var(--toggle-bg);
    border-radius: 50px;
    cursor: pointer;
    transition: background-color 0.3s;
    border: 2px solid var(--siena-gold);
    box-sizing: border-box;
}

.toggle-switch:before {
    content: '';
    position: absolute;
    top: 4px;
    left: 6px;
    width: 16px;
    height: 16px;
    background-color: var(--toggle-circle);
    border-radius: 50%;
    transition: left 0.3s, background 0.2s;
    box-shadow: 0 1px 3px rgba(0,0,0,0.10);
}

.toggle-switch.active {
    background-color: var(--toggle-active);
}

.toggle-switch.active:before {
    left: 28px;
    background: var(--siena-light-green);
}

/* Buttons */
button {
    padding: 0.7rem 2.4rem;
    font-size: 1.09rem;
    font-weight: 600;
    color: var(--button-text);
    background: var(--button-bg);
    border: none;
    border-radius: 7px;
    cursor: pointer;
    margin: 1.2rem 0.5rem 1rem 0;
    box-shadow: 0 2px 8px rgba(0,99,65,0.07);
    transition: background 0.2s, color 0.2s, transform 0.15s;
}

button:hover, button:focus {
    background: var(--button-hover-bg);
    color: var(--button-hover-text);
    transform: translateY(-2px) scale(1.03);
    outline: 2px solid var(--siena-gold);
}

/* Problem & Answer Display */
#problem-content img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 3px 14px rgba(0,99,65,0.10);
    border: 2px solid var(--siena-gold);
    background: var(--siena-tan);
    margin-bottom: 1rem;
}

#answer-display {
    display: none;
    background: var(--card-bg);
    border-radius: 8px;
    border: 1.5px solid var(--siena-gray);
    padding: 1rem 1.5rem;
    color: var(--siena-dark-green);
    box-shadow: 0 2px 10px rgba(0,99,65,0.08);
    margin-bottom: 1.5rem;
    font-size: 1.13rem;
}

/* Footer Styles */
footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 1.5rem 2rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    height: auto;
    font-size: 1.08rem;
    margin-top: auto;
    border-top: 4px solid var(--siena-gold);
    letter-spacing: 0.5px;
}

footer p {
    background: none;
    border: none;
    color: var(--footer-text);
    padding: 0.1rem 1rem;
    margin: 0;
}

/* Responsive Design */
@media (max-width: 700px) {
    main {
        padding: 1.2rem 2vw 1rem 2vw;
    }
    header, nav, footer {
        padding-left: 1vw;
        padding-right: 1vw;
    }
    .theme-toggle {
        right: 1vw;
    }
}

::-webkit-scrollbar {
    width: 8px;
    background: var(--background-color);
}
::-webkit-scrollbar-thumb {
    background: var(--siena-gray);
    border-radius: 4px;
}