:root {
    /* Starlight Showcase Palette */
    --bg-color: #1e0d22;
    --panel-bg: rgba(36, 16, 42, 0.9);
    --border-color: rgba(255, 192, 203, 0.45);
    --border-glow: rgba(255, 105, 180, 0.85);
    --text-primary: #fff0f5;
    --text-secondary: #ebd0f5;
    --serena-pink: #ffb6c1;
    --serena-rose: #ff5277;
    --serena-gold: #ffd166;
    --ribbon-blue: #38bdf8;
    --stage-purple: #2b1038;
    --glow-pink: rgba(255, 82, 119, 0.38);
    --glow-gold: rgba(255, 209, 102, 0.3);
    --glow-blue: rgba(56, 189, 248, 0.35);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* Page Background - Soft Twilight Stage Lighting */
body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(circle at 50% 10%, rgba(255, 209, 102, 0.22) 0%, transparent 45%),
        radial-gradient(circle at 15% 75%, rgba(255, 82, 119, 0.35) 0%, transparent 50%),
        radial-gradient(circle at 85% 75%, rgba(56, 189, 248, 0.3) 0%, transparent 50%);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    overflow: hidden;
    position: relative;
}

/* Floating Stage Sparkles */
.sparkles-container {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 1;
}

.sparkle {
    position: absolute;
    font-size: 1.5rem;
    opacity: 0.7;
    animation: floatSparkle 5s infinite ease-in-out;
}

.s1 { top: 12%; left: 16%; animation-delay: 0s; }
.s2 { top: 72%; left: 10%; animation-delay: 1.2s; }
.s3 { top: 14%; right: 15%; animation-delay: 2.5s; }
.s4 { top: 82%; right: 14%; animation-delay: 3.8s; }
.s5 { top: 45%; left: 86%; animation-delay: 1.8s; }

@keyframes floatSparkle {
    0%, 100% { transform: translateY(0) scale(1) rotate(0deg); opacity: 0.4; }
    50% { transform: translateY(-22px) scale(1.3) rotate(20deg); opacity: 1; filter: drop-shadow(0 0 14px var(--serena-gold)); }
}

/* Chat Main Container - Stage Card */
.chat-container {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 680px;
    height: 85vh;
    background: var(--panel-bg);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
    border: 2px solid var(--border-color);
    border-radius: 28px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 12px 45px rgba(0, 0, 0, 0.85), 0 0 50px var(--glow-pink), 0 0 30px var(--glow-gold);
    overflow: hidden;
    transition: all 0.4s ease;
    animation: stageEntrance 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.chat-container:hover {
    border-color: var(--serena-pink);
    box-shadow: 0 15px 55px rgba(0, 0, 0, 0.92), 0 0 65px rgba(255, 82, 119, 0.55), 0 0 40px rgba(255, 209, 102, 0.45);
}

@keyframes stageEntrance {
    from { opacity: 0; transform: scale(0.93) translateY(22px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

/* Header Section */
.chat-header {
    padding: 22px 28px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 18px;
    background: rgba(28, 12, 34, 0.88);
    position: relative;
}

.chat-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--serena-gold), var(--serena-rose), var(--ribbon-blue), transparent);
}

.avatar-container {
    position: relative;
    width: 58px;
    height: 58px;
}

.avatar-badge {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: linear-gradient(135deg, #ffd166, #ff5277);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2.5px solid var(--serena-pink);
    box-shadow: 0 0 18px var(--glow-pink);
    transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.avatar-icon {
    font-size: 1.85rem;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.35));
}

.avatar-container:hover .avatar-badge {
    transform: scale(1.1) rotate(-8deg);
    box-shadow: 0 0 28px rgba(255, 209, 102, 0.85);
}

.status-indicator {
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 14px;
    height: 14px;
    background-color: var(--serena-gold);
    border-radius: 50%;
    border: 2px solid var(--bg-color);
    box-shadow: 0 0 12px var(--serena-gold);
    animation: statusPulse 2s infinite;
}

@keyframes statusPulse {
    0% { box-shadow: 0 0 0 0 rgba(255, 209, 102, 0.8); }
    70% { box-shadow: 0 0 0 9px rgba(255, 209, 102, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 209, 102, 0); }
}

.header-info h1 {
    font-size: 1.38rem;
    font-weight: 800;
    letter-spacing: 0.8px;
    color: var(--serena-pink);
    text-shadow: 0 0 14px rgba(255, 182, 193, 0.8);
    display: flex;
    align-items: center;
    gap: 6px;
}

.header-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Chat Messages Area */
.chat-messages {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
    scroll-behavior: smooth;
    background: rgba(22, 9, 27, 0.55);
}

.message {
    max-width: 82%;
    display: flex;
    flex-direction: column;
    gap: 6px;
    animation: messageSlide 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes messageSlide {
    from { opacity: 0; transform: translateY(12px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.message.teph {
    align-self: flex-start;
}

.message.user {
    align-self: flex-end;
}

.sender-name {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--serena-gold);
    margin-left: 8px;
    letter-spacing: 0.5px;
}

.message.user .sender-name {
    align-self: flex-end;
    color: var(--ribbon-blue);
    margin-right: 8px;
}

.bubble {
    padding: 14px 18px;
    border-radius: 20px;
    font-size: 0.96rem;
    line-height: 1.6;
    word-wrap: break-word;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.45);
}

.message.teph .bubble {
    background: rgba(52, 20, 60, 0.9);
    border: 1.5px solid var(--serena-pink);
    border-top-left-radius: 4px;
    color: var(--text-primary);
    position: relative;
    box-shadow: 0 0 18px var(--glow-pink);
}

.message.teph .bubble::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--serena-gold), var(--serena-rose));
    border-top-left-radius: 4px;
}

.message.user .bubble {
    background: rgba(18, 30, 48, 0.92);
    border: 1.5px solid var(--ribbon-blue);
    border-top-right-radius: 4px;
    color: #ffffff;
    box-shadow: 0 0 18px var(--glow-blue);
}

/* Typing Indicator */
.typing {
    display: none;
    align-self: flex-start;
    background: rgba(52, 20, 60, 0.9);
    border: 1.5px solid var(--serena-pink);
    padding: 12px 18px;
    border-radius: 20px;
    border-top-left-radius: 4px;
    gap: 7px;
    margin-left: 24px;
    margin-bottom: 10px;
    box-shadow: 0 0 14px var(--glow-pink);
}

.dot {
    width: 8px;
    height: 8px;
    background-color: var(--serena-gold);
    border-radius: 50%;
    animation: dotPulse 1.4s infinite ease-in-out both;
}

.dot:nth-child(1) { animation-delay: -0.32s; }
.dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes dotPulse {
    0%, 80%, 100% { transform: scale(0.3); opacity: 0.3; }
    40% { transform: scale(1.15); opacity: 1; box-shadow: 0 0 10px var(--serena-gold); }
}

/* Input Form Area */
.chat-input-area {
    padding: 18px 24px;
    border-top: 1px solid var(--border-color);
    background: rgba(28, 12, 34, 0.92);
    display: flex;
    gap: 12px;
}

input[type="text"] {
    flex: 1;
    background-color: rgba(15, 6, 18, 0.95);
    border: 1.5px solid var(--border-color);
    border-radius: 16px;
    padding: 14px 20px;
    color: var(--text-primary);
    font-size: 0.96rem;
    outline: none;
    transition: all 0.3s ease;
}

input[type="text"]:focus {
    border-color: var(--serena-rose);
    box-shadow: 0 0 18px var(--glow-pink);
    background-color: rgba(18, 7, 22, 1);
}

button {
    background: linear-gradient(135deg, #ffd166, #ff5277);
    color: #1a0820;
    border: none;
    border-radius: 16px;
    padding: 0 28px;
    font-weight: 800;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 0 18px rgba(255, 209, 102, 0.5);
}

button:hover {
    background: linear-gradient(135deg, #ff5277, #ffd166);
    color: #ffffff;
    box-shadow: 0 0 26px rgba(255, 82, 119, 0.85);
    transform: translateY(-2px) scale(1.02);
}

button:active {
    transform: translateY(1px) scale(0.98);
}

/* Custom Scrollbar */
.chat-messages::-webkit-scrollbar {
    width: 6px;
}
.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}
.chat-messages::-webkit-scrollbar-thumb {
    background: rgba(255, 182, 193, 0.35);
    border-radius: 4px;
}
.chat-messages::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 82, 119, 0.75);
}