/* styles.css */

body {
    margin: 0;
    padding: 0;
    background: linear-gradient(-45deg, #ff9a9e, #fad0c4, #fbc2eb, #a18cd1);
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    height: 100vh;
    background-size: 400% 400%;
    animation: gradientFlow 10s ease infinite;
    transition: background-color 0.6s ease-in-out;
}
@keyframes gradientFlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
.intro-screen {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background: black;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: fadeOut 2s ease 2.5s forwards;
}
.platform-title {
    font-size: 3rem;
    color: #ff9a9e;
    font-family: 'Orbitron', sans-serif;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 0.2; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.1); }
    100% { opacity: 0.2; transform: scale(1); }
}

@keyframes fadeOut {
    to { opacity: 0; visibility: hidden; }
}
.modal {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9998;
}
.modal-content {
    background: #fff;
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
}
.auth-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2rem;
}
.auth-btn {
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: white;
    box-shadow: 0 0 10px rgba(0,255,255,0.4);
}
.auth-btn.guest {
    background: linear-gradient(135deg, #ff758c, #dc7aa5);
}
.auth-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.8);
}

.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: #fefefe;
    color: rgb(0, 0, 0);
    text-align: center;
    font-size: 1.5rem;
    padding: 10px 0;
    font-family: 'Orbitron', sans-serif;
    z-index: 999;  /* 确保它位于其他内容的上层 */
}

.top-bar h1 {
    margin: 0;
    font-size: 1.8rem;
    color: #666;
    text-transform: uppercase;
}

.hamburger {
    cursor: pointer;
    display: inline-block;
    padding: 10px;
}

.hamburger div {
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 5px 0;
    transition: 0.4s;
}

.dropdown {
    position: absolute;
    top: 5px;
    right: 20px;
    z-index: 1001;
}

.dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    padding: 12px 16px;
    border-radius: 8px;
    animation: dropdownAnim 0.3s ease-out;
}

@keyframes dropdownAnim {
    from { opacity: 0; transform: translateY(-10px);}
    to { opacity: 1; transform: translateY(0);}
}

.dropdown-content a {
    color: #333;
    font-size: medium;
    padding: 8px 0;
    text-decoration: none;
    display: block;
}

.dropdown-content a:hover {
    background-color: #eee;
    border-radius: 4px;
    padding-left: 8px;
}

#mainContent {
    padding-bottom: 70px;
    margin-top: 60px;
}
.chat-window {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.message {
    max-width: 70%;
    padding: 0.6rem 1rem;
    border-radius: 1rem;
    position: relative;
    word-break: break-word;
}
.user {
    align-self: flex-end;
    background: #dcf8c6;
    margin-right: 1rem;
}
.ai {
    align-self: flex-start;
    background: #fff;
    margin-left: 1rem;
}
.input-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: white;
    display: flex;
    padding: 10px;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 10;
    box-sizing: border-box;
}
.input-bar input {
    flex: 1;
    padding: 0.6rem 1rem;
    border: none;
    border-radius: 2rem;
    margin-right: 0.5rem;
    font-size: 1rem;
    box-sizing: border-box;
}
.input-bar button {
    padding: 0 1rem;
    border: none;
    background: #128c7e;
    color: #fff;
    border-radius: 2rem;
    font-size: 1rem;
    cursor: pointer;
    box-sizing: border-box;
}
.input-bar button:disabled {
    background: #ccc;
    cursor: not-allowed;
}
.feedback-buttons {
margin-top: 8px;
text-align: left;
font-family: 'Arial', sans-serif;
}

.feedback-prompt {
    font-size: 14px;
    color: #666;
    margin-bottom: 5px;
}

.feedback-buttons-group {
    display: flex;
    gap: 10px;
}

.feedback-btn {
    font-size: 20px;
    background: none;
    border: none;
    cursor: pointer;
    transition: transform 0.2s ease, filter 0.2s ease;
}

.feedback-btn:hover {
    transform: scale(1.2);
    filter: brightness(1.2);
}

.feedback-btn:active {
    transform: scale(0.95);
}