@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700&display=swap');

* {
    box-sizing: border-box;
}

html {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Nunito', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    height: 100dvh;
    background-color: #eee;
    margin: 0;
    padding: 10px;
    overflow: hidden;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
}

/* --- Chatbox --- */
.chatbox {
    width: 100%;
    max-width: 500px;
    height: 90%;
    max-height: 750px;
    background-color: #fff;
    display: flex;
    flex-direction: column;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.12);
    overflow: hidden;
}

/* --- Header --- */
.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    background-color: #075e54;
    color: white;
}

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

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #25d366;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
}

.header-info h1 {
    margin: 0;
    font-size: 17px;
    font-weight: 700;
}

.status {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
    opacity: 0.85;
}

.status-dot {
    width: 7px;
    height: 7px;
    background: #25d366;
    border-radius: 50%;
}

.clear-btn {
    background: rgba(255,255,255,0.15);
    border: none;
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    color: white;
    transition: background 0.2s;
}

.clear-btn:hover {
    background: rgba(255,255,255,0.25);
}

/* --- Chat Log --- */
#chatlog {
    flex: 1;
    min-height: 0; /* crucial for flex scroll */
    padding: 18px;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch; /* smooth iOS scroll */
    overscroll-behavior-y: contain; /* prevent pull-to-refresh */
    gap: 10px;
    scroll-behavior: smooth;
    background: #ece5dd;
}

/* --- Welcome Message --- */
.welcome-message {
    text-align: center;
    padding: 40px 20px;
    color: #888;
}

.welcome-avatar {
    font-size: 44px;
    margin-bottom: 12px;
}

.welcome-message h2 {
    margin: 0 0 6px 0;
    color: #333;
    font-size: 22px;
}

.welcome-message p {
    margin: 0;
    font-size: 14px;
}

/* --- Messages --- */
.user, .Maddy {
    border-radius: 10px;
    max-width: 80%;
    word-wrap: break-word;
}

/* --- User Message --- */
.user {
    padding: 10px 14px;
    background-color: #dcf8c6;
    color: #111;
    align-self: flex-end;
    border-bottom-right-radius: 3px;
}

.user .message-content {
    line-height: 1.45;
    font-size: 14px;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    word-break: break-word;
}

.user .timestamp {
    display: block;
    font-size: 10px;
    color: #777;
    text-align: right;
    margin-top: 4px;
}

/* --- Maddy Message --- */
.Maddy {
    padding: 10px 14px;
    background-color: #fff;
    color: #222;
    align-self: flex-start;
    border-bottom-left-radius: 3px;
    line-height: 1.55;
}

.Maddy .message-header {
    margin-bottom: 4px;
}

.Maddy .bot-name {
    font-weight: 700;
    color: #075e54;
    font-size: 12px;
}

.Maddy .message-content {
    font-size: 14px;
}

.Maddy .message-content p {
    margin: 0 0 8px 0;
}

.Maddy .message-content p:last-child {
    margin-bottom: 0;
}

.Maddy .timestamp {
    display: block;
    font-size: 10px;
    color: #999;
    margin-top: 6px;
}

/* --- Lists --- */
.Maddy ul, .Maddy ol {
    margin: 6px 0;
    padding-left: 22px;
}

.Maddy li {
    margin-bottom: 4px;
}

/* --- Typing --- */
.Maddy.typing {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
}

.typing-indicator {
    display: flex;
    gap: 4px;
}

.typing-indicator span {
    width: 7px;
    height: 7px;
    background: #999;
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(1) { animation-delay: 0s; }
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-6px); }
}

.typing-text {
    font-size: 13px;
    color: #888;
    font-style: italic;
}

/* --- Input --- */
.input-area {
    display: flex;
    align-items: flex-end;
    padding: 10px 14px;
    padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px)); /* iPhone notch */
    background-color: #f0f0f0;
    border-top: 1px solid #ddd;
    gap: 10px;
    flex-shrink: 0;
}

#userinput {
    flex: 1;
    padding: 10px 16px;
    border: 1px solid #ccc;
    border-radius: 22px;
    font-size: 14px;
    outline: none;
    font-family: inherit;
    background: #fff;
    min-height: 44px;
    max-height: 260px;
    resize: none;
    overflow-y: auto;
    -ms-overflow-style: none; /* IE/Edge legacy */
    scrollbar-width: none; /* Firefox */
    line-height: 1.4;
}

#userinput::-webkit-scrollbar {
    width: 0;
    height: 0;
}

#userinput:focus {
    border-color: #075e54;
}

#userinput:disabled {
    background: #eee;
    cursor: not-allowed;
}

#sendBtn {
    width: 44px;
    height: 44px;
    padding: 0;
    border: none;
    background-color: #075e54;
    color: white;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

#sendBtn:hover:not(:disabled) {
    background-color: #064e46;
}

#sendBtn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* --- Scrollbar --- */
#chatlog::-webkit-scrollbar {
    width: 5px;
}

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

#chatlog::-webkit-scrollbar-thumb {
    border-radius: 3px;
    background: #bbb;
}

#chatlog::-webkit-scrollbar-thumb:hover {
    background: #999;
}

/* --- Code Blocks --- */
.Maddy pre {
    background-color: #282c34 !important;
    padding: 14px;
    border-radius: 8px;
    overflow-x: auto;
    white-space: pre;
    margin: 8px 0;
    position: relative;
    max-width: 100%;
}

.Maddy pre code {
    color: #abb2bf !important;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    line-height: 1.45;
    white-space: pre;
}

.Maddy code {
    font-family: 'Consolas', 'Monaco', monospace;
    background: #f0f0f0;
    padding: 2px 5px;
    border-radius: 3px;
    font-size: 13px;
    color: #c7254e;
}

.Maddy pre code {
    background: transparent !important;
    padding: 0;
}

.Maddy .table-scroll {
    position: relative;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    margin: 10px 0;
    padding-top: 30px;
    border-radius: 8px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: #b7b7b7 transparent;
}

.Maddy .table-scroll::-webkit-scrollbar {
    height: 5px;
}

.Maddy .table-scroll::-webkit-scrollbar-track {
    background: transparent;
}

.Maddy .table-scroll::-webkit-scrollbar-thumb {
    background: #b7b7b7;
    border-radius: 999px;
}

.Maddy .table-scroll::-webkit-scrollbar-thumb:hover {
    background: #999;
}

.Maddy .message-content table {
    width: max-content;
    min-width: 100%;
    border-collapse: collapse;
    background: #fff;
}

.Maddy .message-content th,
.Maddy .message-content td {
    padding: 8px 10px;
    border: 1px solid #d7d7d7;
    text-align: left;
    vertical-align: top;
    white-space: nowrap;
}

.Maddy .message-content th {
    background: #f4f4f4;
    font-weight: 700;
}

.Maddy .message-content .katex-display {
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: #b7b7b7 transparent;
}

.Maddy .message-content .katex-display::-webkit-scrollbar {
    height: 4px;
}

.Maddy .message-content .katex-display::-webkit-scrollbar-track {
    background: transparent;
}

.Maddy .message-content .katex-display::-webkit-scrollbar-thumb {
    background: #b7b7b7;
    border-radius: 999px;
}

.Maddy .message-content .katex-display::-webkit-scrollbar-thumb:hover {
    background: #999;
}

.Maddy .message-content {
    overflow: hidden;
    max-width: 100%;
}

/* --- Copy Button --- */
.copy-btn {
    position: absolute;
    top: 6px;
    right: 6px;
    padding: 3px 8px;
    font-size: 11px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: #aaa;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s;
}

.copy-btn:hover {
    background: rgba(255,255,255,0.2);
    color: #fff;
}

.table-copy-btn {
    top: 0;
    right: 0;
    background: #f3f3f3;
    border: 1px solid #d7d7d7;
    color: #555;
}

.table-copy-btn:hover {
    background: #e9e9e9;
    color: #222;
}

/* ========== RESPONSIVE: Mobile Small (up to 380px) ========== */
@media (max-width: 380px) {
    body {
        padding: 0;
    }

    body {
        padding: 0;
    }

    .chatbox {
        height: 100%;
        max-height: none;
        border-radius: 0;
    }

    .chat-header {
        padding: 10px 12px;
        flex-shrink: 0;
    }

    .avatar {
        width: 34px;
        height: 34px;
        font-size: 15px;
    }

    .header-info h1 {
        font-size: 15px;
    }

    #chatlog {
        padding: 10px;
        gap: 8px;
    }

    .user, .Maddy {
        max-width: 88%;
        padding: 8px 10px;
    }

    .user .message-content,
    .Maddy .message-content {
        font-size: 13px;
    }

    .Maddy pre code {
        font-size: 11px;
    }

    .input-area {
        padding: 8px 10px;
        padding-bottom: calc(8px + env(safe-area-inset-bottom, 0px));
        gap: 8px;
    }

    #userinput {
        padding: 9px 14px;
        font-size: 16px; /* 16px prevents iOS zoom on focus */
    }

    #sendBtn {
        width: 40px;
        height: 40px;
    }

    .welcome-message h2 {
        font-size: 18px;
    }

    .welcome-avatar {
        font-size: 36px;
    }
}

/* ========== RESPONSIVE: Mobile (381px to 480px) ========== */
@media (min-width: 381px) and (max-width: 480px) {
    body {
        padding: 0;
    }

    .chatbox {
        height: 100%;
        max-height: none;
        border-radius: 0;
    }

    #chatlog {
        padding: 14px;
    }

    .user, .Maddy {
        max-width: 85%;
    }

    #userinput {
        font-size: 16px;
    }
}

/* ========== RESPONSIVE: Tablet (481px to 768px) ========== */
@media (min-width: 481px) and (max-width: 768px) {
    body {
        padding: 15px;
    }

    .chatbox {
        max-width: 520px;
        height: 90%;
        max-height: 800px;
    }

    .user, .Maddy {
        max-width: 80%;
    }
}

/* ========== RESPONSIVE: Small Desktop (769px to 1024px) ========== */
@media (min-width: 769px) and (max-width: 1024px) {
    .chatbox {
        max-width: 600px;
        height: 88%;
        max-height: 800px;
    }

    .user, .Maddy {
        max-width: 75%;
    }

    .Maddy .message-content {
        font-size: 15px;
    }
}

/* ========== RESPONSIVE: Desktop (1025px+) ========== */
@media (min-width: 1025px) {
    .chatbox {
        max-width: 700px;
        height: 85%;
        max-height: 850px;
    }

    .user, .Maddy {
        max-width: 70%;
    }

    .Maddy .message-content {
        font-size: 15px;
    }

    .user .message-content {
        font-size: 15px;
    }
}

/* ========== RESPONSIVE: Large Desktop (1440px+) ========== */
@media (min-width: 1440px) {
    .chatbox {
        max-width: 780px;
        height: 80%;
        max-height: 900px;
    }
}

/* ========== Landscape phone fix ========== */
@media (max-height: 500px) {
    body {
        padding: 0;
    }

    .chatbox {
        height: 100%;
        max-height: none;
        border-radius: 0;
    }

    .chat-header {
        padding: 8px 14px;
    }

    .avatar {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }

    .welcome-message {
        padding: 20px 15px;
    }

    .welcome-avatar {
        font-size: 32px;
        margin-bottom: 8px;
    }

    .welcome-message h2 {
        font-size: 18px;
    }
}