:root {
    --primary-color: #ff7eb3;
    --secondary-color: #ff758c;
    --bg-gradient-start: #ff9a9e;
    --bg-gradient-end: #fad0c4;
    --chat-bg: rgba(255, 255, 255, 0.25);
    --msg-user-bg: #ff7eb3;
    --msg-bot-bg: #ffffff;
    --text-color: #4a4a4a;
    --input-bg: rgba(255, 255, 255, 0.9);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'ZCOOL XiaoWei', sans-serif;
    /* A romantic Chinese font */
}

body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    overflow: hidden;
    position: relative;
}

/* Background Animation */
.background-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.heart-particle {
    position: absolute;
    color: rgba(255, 255, 255, 0.6);
    animation: floating 10s infinite linear;
    font-size: 20px;
    user-select: none;
}

@keyframes floating {
    0% {
        transform: translateY(110vh) rotate(0deg);
        opacity: 0;
    }

    10% {
        opacity: 1;
    }

    90% {
        opacity: 1;
    }

    100% {
        transform: translateY(-10vh) rotate(360deg);
        opacity: 0;
    }
}

/* Chat Container */
.chat-container {
    width: 100%;
    max-width: 450px;
    height: 90vh;
    /* Mobile friendly */
    background: var(--chat-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.2);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    max-height: 800px;
}

@media (max-width: 480px) {
    .chat-container {
        height: 100vh;
        max-height: none;
        border-radius: 0;
        width: 100%;
    }
}

/* Header */
.chat-header {
    padding: 15px 20px;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255, 255, 255, 0.5);
    z-index: 10;
}

.avatar img {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.header-info {
    text-align: center;
    flex-grow: 1;
}

.header-info h1 {
    font-size: 1.2rem;
    color: #ff5e78;
    margin-bottom: 2px;
}

.status {
    font-size: 0.8rem;
    color: #666;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.status::before {
    content: '';
    display: block;
    width: 8px;
    height: 8px;
    background: #4cd137;
    border-radius: 50%;
}

/* Messages Area */
.chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
    scroll-behavior: smooth;
}

.message {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 18px;
    font-size: 0.95rem;
    line-height: 1.5;
    position: relative;
    animation: messagePop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    word-wrap: break-word;
}

@keyframes messagePop {
    from {
        transform: scale(0.8);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.message.user {
    align-self: flex-end;
    background: var(--msg-user-bg);
    color: white;
    border-bottom-right-radius: 4px;
    box-shadow: 0 4px 15px rgba(255, 126, 179, 0.3);
}

.message.bot {
    align-self: flex-start;
    background: var(--msg-bot-bg);
    color: var(--text-color);
    border-bottom-left-radius: 4px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.message.system-message {
    align-self: center;
    background: transparent;
    color: #888;
    text-align: center;
    font-size: 0.85rem;
    box-shadow: none;
    border: 1px dashed rgba(255, 255, 255, 0.5);
    background: rgba(255, 255, 255, 0.3);
}

.time {
    font-size: 0.7rem;
    opacity: 0.7;
    display: block;
    margin-top: 4px;
    text-align: right;
}

.message.bot .time {
    text-align: left;
}

/* Input Area */
.input-area {
    padding: 15px;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
}

.input-wrapper {
    display: flex;
    background: var(--input-bg);
    border-radius: 30px;
    padding: 5px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s;
}

.input-wrapper:focus-within {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 12px 20px;
    font-size: 1rem;
    outline: none;
    color: #444;
}

.send-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.send-btn:hover {
    background: #ff5e95;
    transform: scale(1.05) rotate(-10deg);
}

.send-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.4);
    border-radius: 10px;
}