:root {
    --bg-color: #f4f7f9;
    --container-bg: #ffffff;
    --header-bg: #f7f7f7;
    --button-bg: #007bff;
    --button-hover: #0056b3;
    --user-msg-bg: #007bff;
    --gemini-msg-bg: #e9ebee;
    --text-color: #333;
    --border-color: #ddd;
    --logout-bg: #6c757d;
    --logout-hover: #5a6268;
    --input-border: #ccc;
    --flash-error: #dc3545;
    --flash-success: #28a745;
    --flash-info: #007bff;
    --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --toggle-bg: #ccc;
    --toggle-bg-active: #2196f3;
}

body.dark {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --header-bg: #1a1a1a;
    --button-bg: #0066cc;
    --button-hover: #004499;
    --user-msg-bg: #007bff;
    --gemini-msg-bg: #333333;
    --text-color: #e0e0e0;
    --border-color: #444444;
    --logout-bg: #595959;
    --logout-hover: #444444;
    --input-border: #555555;
    --flash-error: #ff6b6b;
    --flash-success: #4ade80;
    --flash-info: #3b82f6;
    --box-shadow: 0 4px 20px rgba(255, 255, 255, 0.1);
    --toggle-bg: #555;
    --toggle-bg-active: #66a7ff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100dvh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.chat-container {
    width: 90%;
    max-width: 600px;
    height: 90vh;
    max-height: 800px;
    background-color: var(--container-bg);
    border-radius: 12px;
    box-shadow: var(--box-shadow);
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.chat-history {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto;
}

.message {
    margin-bottom: 15px;
    display: flex;
}

.message p {
    padding: 10px 15px;
    border-radius: 18px;
    max-width: 80%;
    line-height: 1.5;
}

.user-message {
    justify-content: flex-end;
}

.user-message p {
    background-color: var(--user-msg-bg);
    color: white;
    border-bottom-right-radius: 4px;
}

.gemini-message {
    justify-content: flex-start;
}

.gemini-message p {
    background-color: var(--gemini-msg-bg);
    color: var(--text-color);
    border-bottom-left-radius: 4px;
}

.gemini-message.thinking p {
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { opacity: 0.5; }
    50% { opacity: 1; }
    100% { opacity: 0.5; }
}


.chat-form {
    display: flex;
    padding: 15px;
    border-top: 1px solid var(--border-color);
}

#message-input {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid var(--input-border);
    border-radius: 20px;
    margin-right: 10px;
    font-size: 16px;
    background-color: var(--container-bg);
    color: var(--text-color);
    transition: border-color 0.3s ease, background-color 0.3s ease, color 0.3s ease;
}

.chat-form button {
    padding: 10px 20px;
    border: none;
    background-color: var(--button-bg);
    color: white;
    border-radius: 20px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.2s;
}

.chat-form button:hover {
    background-color: var(--button-hover);
}

/* === STYLES FOR LOGIN PAGE === */
.login-container {
    width: 90%;
    max-width: 400px;
    padding: 30px;
    background-color: var(--container-bg);
    border-radius: 12px;
    box-shadow: var(--box-shadow);
    text-align: center;
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
}

.login-form input {
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 16px;
    background-color: var(--container-bg);
    color: var(--text-color);
    transition: border-color 0.3s ease, background-color 0.3s ease, color 0.3s ease;
}

.login-form button {
    padding: 12px 20px;
    border: none;
    background-color: var(--button-bg);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.2s;
}

.login-form button:hover {
    background-color: var(--button-hover);
}

/* === STYLES FOR FLASH MESSAGES === */
.flash-messages {
    padding: 0;
    list-style: none;
    margin-bottom: 15px;
}

.flash {
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 4px;
    color: #fff;
    text-align: center;
}

.flash.error {
    background-color: var(--flash-error);
}

.flash.success {
    background-color: var(--flash-success);
}

.flash.info {
    background-color: var(--flash-info);
}

/* === DARK MODE TOGGLE SWITCH === */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--toggle-bg);
    -webkit-transition: .4s;
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    -webkit-transition: .4s;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--toggle-bg-active);
}

input:checked + .slider:before {
    -webkit-transform: translateX(26px);
    -ms-transform: translateX(26px);
    transform: translateX(26px);
}

/* === STYLES FOR CHAT HEADER === */
.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--header-bg);
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
    gap: 1rem;
}

.chat-header h3 {
    margin: 0;
    font-size: 18px;
    color: var(--text-color);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logout-button {
    text-decoration: none;
    padding: 6px 14px;
    background-color: var(--logout-bg);
    color: white;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.2s;
}

.logout-button:hover {
    background-color: var(--logout-hover);
}

/* LOGO STYLES */
.chat-title {
    display: flex;
    align-items: center;
    max-width: 50%;
}

.dark-mode-logo {
    display: none;
    width: 100%;
    height: auto;
    max-height: 40px;
}

body.dark .dark-mode-logo {
    display: block;
}

body.dark .light-mode-title {
    display: none;
}


/* === MOBILE RESPONSIVENESS === */
@media (max-width: 480px) {
    /* Make the chat container full-screen on mobile for a better experience */
    .chat-container {
        width: 100%;
        height: 100%;
        border-radius: 0;
        max-height: none;
    }

    .chat-form {
        padding: 10px; /* Reduce padding on the form container */
    }

    #message-input {
        margin-right: 8px; /* Reduce space between input and button */
    }

    .chat-form button {
        /* Make the button more compact by reducing its horizontal padding */
        padding: 10px 15px;
    }

    .chat-header {
        /* Ensure the header respects the new full-screen layout */
        border-top-left-radius: 0;
        border-top-right-radius: 0;
    }
}

/* Disable hover effects on touch devices */
@media (hover: none) and (pointer: coarse) {
    .chat-form button:hover,
    .login-form button:hover,
    .logout-button:hover {
        background-color: var(--button-bg);
    }
}