/* ===========================
   CSS Variables & Reset
   =========================== */
:root {
    /* WhatsApp Color Palette */
    --wa-green: #00A884;
    --wa-green-dark: #008069;
    --wa-green-light: #00D9A3;
    --wa-teal: #075E54;
    --wa-light-green: #D9FDD3;
    --wa-blue: #34B7F1;
    --wa-gray: #8696A0;
    --wa-gray-light: #F0F2F5;
    --wa-white: #FFFFFF;
    --wa-black: #111B21;
    --wa-bg: #0B141A;
    --wa-panel: #202C33;
    --wa-hover: #2A3942;
    
    /* Message Colors */
    --msg-received-bg: #202C33;
    --msg-sent-bg: #005C4B;
    --msg-text: #E9EDEF;
    --msg-time: #8696A0;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.2);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #0B141A 0%, #1A2A33 100%);
    color: var(--msg-text);
    overflow: hidden;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===========================
   Chat Container
   =========================== */
.chat-container {
    width: 100%;
    max-width: 480px;
    height: 100vh;
    background: var(--wa-bg);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    position: relative;
}

@media (min-width: 768px) {
    .chat-container {
        height: 95vh;
        max-height: 900px;
        border-radius: 12px;
        overflow: hidden;
    }
}

/* ===========================
   Header
   =========================== */
.chat-header {
    background: var(--wa-panel);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(134, 150, 160, 0.15);
    min-height: 60px;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
}

.back-button {
    color: var(--msg-text);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-button:hover {
    background: var(--wa-hover);
}

.bot-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}

.bot-info {
    flex: 1;
    min-width: 0;
}

.bot-name {
    font-size: 16px;
    font-weight: 500;
    color: var(--msg-text);
    margin-bottom: 2px;
}

.bot-status {
    font-size: 13px;
    color: var(--wa-gray);
    display: flex;
    align-items: center;
    gap: 4px;
}

.bot-status::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--wa-green-light);
    border-radius: 50%;
    display: inline-block;
    animation: pulse 2s ease-in-out infinite;
}

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

.header-actions {
    display: flex;
    gap: 8px;
}

.icon-button {
    background: transparent;
    border: none;
    color: var(--wa-gray);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-button:hover {
    background: var(--wa-hover);
    color: var(--msg-text);
}

/* ===========================
   Chat Messages Area
   =========================== */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px 16px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect fill="%230B141A" width="100" height="100"/><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.02"/></svg>');
    background-size: 50px 50px;
    scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar {
    width: 6px;
}

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

.chat-messages::-webkit-scrollbar-thumb {
    background: rgba(134, 150, 160, 0.3);
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: rgba(134, 150, 160, 0.5);
}

.date-divider {
    text-align: center;
    margin: 20px 0;
}

.date-divider span {
    background: var(--wa-panel);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 12px;
    color: var(--wa-gray);
    box-shadow: var(--shadow-sm);
}

/* ===========================
   Message Bubbles
   =========================== */
.message {
    display: flex;
    margin-bottom: 12px;
    animation: messageSlideIn var(--transition-base) ease-out;
}

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

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

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

.message-bubble {
    max-width: 65%;
    padding: 8px 12px;
    border-radius: 8px;
    position: relative;
    box-shadow: var(--shadow-sm);
    word-wrap: break-word;
}

.message.received .message-bubble {
    background: var(--msg-received-bg);
    border-bottom-left-radius: 2px;
}

.message.sent .message-bubble {
    background: var(--msg-sent-bg);
    border-bottom-right-radius: 2px;
}

.message-text {
    font-size: 14.5px;
    line-height: 1.5;
    color: var(--msg-text);
    margin-bottom: 4px;
}

.message-time {
    font-size: 11px;
    color: var(--msg-time);
    text-align: right;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 4px;
    margin-top: 4px;
}

.message.sent .message-time {
    color: rgba(255, 255, 255, 0.6);
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 12px;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--wa-gray);
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.7;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* ===========================
   Quick Replies
   =========================== */
.quick-replies {
    padding: 12px 16px;
    background: var(--wa-bg);
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    max-height: 200px;
    overflow-y: auto;
}

.quick-replies::-webkit-scrollbar {
    width: 4px;
}

.quick-replies::-webkit-scrollbar-track {
    background: transparent;
}

.quick-replies::-webkit-scrollbar-thumb {
    background: rgba(134, 150, 160, 0.3);
    border-radius: 2px;
}

.quick-reply-btn {
    background: var(--wa-panel);
    border: 1px solid var(--wa-green);
    color: var(--wa-green-light);
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.quick-reply-btn:hover {
    background: var(--wa-green);
    color: var(--wa-white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 168, 132, 0.3);
}

.quick-reply-btn:active {
    transform: translateY(0);
}

/* ===========================
   Input Area
   =========================== */
.chat-input-container {
    background: var(--wa-panel);
    padding: 10px 16px;
    border-top: 1px solid rgba(134, 150, 160, 0.15);
}

.input-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
}

.attach-button {
    color: var(--wa-gray);
}

.input-field-wrapper {
    flex: 1;
    background: var(--wa-bg);
    border-radius: 24px;
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 8px;
}

.chat-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--msg-text);
    font-size: 15px;
    padding: 12px 0;
    font-family: inherit;
}

.chat-input::placeholder {
    color: var(--wa-gray);
}

.emoji-button {
    color: var(--wa-gray);
}

.send-button {
    background: var(--wa-green);
    border: none;
    color: var(--wa-white);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.send-button:hover {
    background: var(--wa-green-dark);
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(0, 168, 132, 0.4);
}

.send-button:active {
    transform: scale(0.95);
}

/* ===========================
   Calendar Picker (Custom)
   =========================== */
.calendar-container {
    background: var(--msg-received-bg);
    border-radius: 12px;
    padding: 16px;
    margin: 8px 0;
    max-width: 320px;
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.calendar-month {
    font-size: 16px;
    font-weight: 600;
    color: var(--msg-text);
}

.calendar-nav {
    background: transparent;
    border: none;
    color: var(--wa-green-light);
    cursor: pointer;
    padding: 4px;
    font-size: 18px;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: var(--msg-text);
    cursor: pointer;
    border-radius: 8px;
    transition: all var(--transition-fast);
}

.calendar-day.header {
    color: var(--wa-gray);
    font-weight: 600;
    cursor: default;
}

.calendar-day.selectable:hover {
    background: var(--wa-hover);
}

.calendar-day.selected {
    background: var(--wa-green);
    color: var(--wa-white);
}

.calendar-day.disabled {
    color: var(--wa-gray);
    opacity: 0.3;
    cursor: not-allowed;
}

/* ===========================
   Time Slots
   =========================== */
.time-slots-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 8px;
    margin: 8px 0;
}

.time-slot {
    background: var(--wa-panel);
    border: 1px solid var(--wa-green);
    color: var(--wa-green-light);
    padding: 12px;
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 14px;
    font-weight: 500;
}

.time-slot:hover {
    background: var(--wa-green);
    color: var(--wa-white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 168, 132, 0.3);
}

.time-slot.disabled {
    opacity: 0.3;
    cursor: not-allowed;
    border-color: var(--wa-gray);
    color: var(--wa-gray);
}

.time-slot.disabled:hover {
    background: var(--wa-panel);
    transform: none;
    box-shadow: none;
}

/* ===========================
   Service Cards
   =========================== */
.service-card {
    background: var(--wa-panel);
    border-radius: 12px;
    padding: 16px;
    margin: 8px 0;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.service-card:hover {
    border-color: var(--wa-green);
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(0, 168, 132, 0.2);
}

.service-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--msg-text);
    margin-bottom: 8px;
}

.service-details {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: var(--wa-gray);
}

.service-price {
    color: var(--wa-green-light);
    font-weight: 600;
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 768px) {
    .chat-container {
        border-radius: 0;
        height: 100vh;
        max-height: none;
    }
    
    .message-bubble {
        max-width: 80%;
    }
    
    .time-slots-container {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    }
}

/* ===========================
   Utility Classes
   =========================== */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn var(--transition-base) ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}