style.css

/* ========================================
   MODERN AI CHATBOT - CUSTOMIZABLE STYLES
   ======================================== */

:root {
    /* ===== COLOR THEME ===== */
    --primary: #6366f1;           /* Deep Indigo */
    --primary-dark: #4f46e5;      /* Darker Indigo */
    --primary-light: #818cf8;     /* Light Indigo */
    
    --secondary: #ec4899;         /* Vibrant Magenta/Pink */
    --secondary-dark: #db2777;    /* Dark Magenta */
    --secondary-light: #f472b6;   /* Light Pink */
    
    --accent: #06b6d4;            /* Bright Cyan */
    --accent-light: #22d3ee;      /* Light Cyan */
    
    --bg-gradient-1: #6366f1;     /* Indigo */
    --bg-gradient-2: #a855f7;     /* Purple */
    
    --text-dark: #1f2937;         /* Dark Gray */
    --text-light: #6b7280;        /* Light Gray */
    --text-white: #ffffff;        /* White */
    
    --bg-light: #f9fafb;          /* Light Background */
    --bg-chat: #f3f4f6;           /* Chat Area Background */
    --bg-white: #ffffff;          /* Pure White */
    
    --border-color: #e5e7eb;      /* Border Gray */
    --shadow: 0 10px 30px rgba(99, 102, 241, 0.15);
    
    /* ===== SPACING & SIZING ===== */
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    width: 100%;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-1) 0%, var(--bg-gradient-2) 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow: hidden;
}

/* ========== CONTAINER ========== */
.container {
    width: 100%;
    max-width: 750px;
    height: 90vh;
    max-height: 750px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ========== HEADER ========== */
.header {
    background: linear-gradient(135deg, var(--bg-gradient-1) 0%, var(--bg-gradient-2) 100%);
    color: var(--text-white);
    padding: 20px 25px;
}

.header-top {
    margin-bottom: 15px;
}

.title {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 6px;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 13px;
    opacity: 0.9;
    font-weight: 400;
}

.status-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.status-dot.active {
    background: #10b981;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.6;
        transform: scale(1.2);
    }
}

#status {
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.5px;
}

/* ========== CHAT AREA ========== */
.chat-area {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: var(--bg-chat);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Scrollbar Styling */
.chat-area::-webkit-scrollbar {
    width: 6px;
}

.chat-area::-webkit-scrollbar-track {
    background: transparent;
}

.chat-area::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: 3px;
}

.chat-area::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    color: var(--text-light);
    text-align: center;
}

.empty-icon {
    font-size: 48px;
    margin-bottom: 15px;
    opacity: 0.7;
}

.empty-state p {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.empty-state small {
    font-size: 12px;
    color: var(--text-light);
}

/* Messages */
.message {
    display: flex;
    animation: slideIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

/* User Message */
.user-message {
    justify-content: flex-end;
}

.user-message .text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--text-white);
    padding: 12px 16px;
    border-radius: var(--radius-md) var(--radius-md) 4px var(--radius-md);
    max-width: 70%;
    word-wrap: break-word;
    font-size: 14px;
    line-height: 1.4;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

/* Bot Message */
.bot-message {
    justify-content: flex-start;
}

.bot-message .text {
    background: var(--bg-white);
    color: var(--text-dark);
    padding: 12px 16px;
    border-radius: var(--radius-md) var(--radius-md) var(--radius-md) 4px;
    max-width: 70%;
    word-wrap: break-word;
    font-size: 14px;
    line-height: 1.4;
    border: 1.5px solid var(--accent-light);
    box-shadow: 0 2px 8px rgba(6, 182, 212, 0.1);
}

/* Status Message */
.status-message {
    justify-content: center;
}

.status-message .text {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
    color: var(--primary);
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    border: 1px solid var(--accent-light);
    text-align: center;
    font-weight: 500;
}

.message .text {
    word-break: break-word;
    overflow-wrap: break-word;
}

/* ========== INPUT AREA ========== */
.input-container {
    padding: 15px 20px;
    background: var(--bg-white);
    border-top: 1px solid var(--border-color);
}

.input-area {
    display: flex;
    gap: 10px;
    margin-bottom: 8px;
}

input {
    flex: 1;
    border: 1.5px solid var(--border-color);
    border-radius: 25px;
    padding: 12px 18px;
    font-size: 14px;
    outline: none;
    background: var(--bg-light);
    color: var(--text-dark);
    transition: var(--transition);
}

input::placeholder {
    color: var(--text-light);
}

input:focus {
    border-color: var(--accent);
    background: var(--bg-white);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

input:disabled {
    background: var(--bg-light);
    cursor: not-allowed;
    opacity: 0.6;
}

.send-button {
    width: 45px;
    height: 45px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--text-white);
    cursor: pointer;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3);
}

.send-button:hover:not(:disabled) {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 20px rgba(236, 72, 153, 0.4);
}

.send-button:active:not(:disabled) {
    transform: translateY(-1px) scale(0.98);
}

.send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.send-icon {
    display: inline-block;
    transition: var(--transition);
}

.send-button:hover:not(:disabled) .send-icon {
    animation: sparkle 0.6s ease-in-out;
}

@keyframes sparkle {
    0%, 100% { transform: rotate(0deg) scale(1); }
    50% { transform: rotate(180deg) scale(1.1); }
}

.hint {
    font-size: 11px;
    color: var(--text-light);
    text-align: center;
    margin: 0;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 600px) {
    .container {
        max-width: 100%;
        height: 100vh;
        max-height: 100vh;
        border-radius: 16px;
    }

    .title {
        font-size: 22px;
    }

    .subtitle {
        font-size: 12px;
    }

    .user-message .text,
    .bot-message .text {
        max-width: 85%;
        font-size: 13px;
    }

    input {
        font-size: 16px;
        padding: 10px 14px;
    }

    .send-button {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
}