/* ================================================
   Ava Web UI — Antigravity-style centered layout
   ================================================ */

:root {
    /* Colors — Light mode */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f8fa;
    --bg-surface: #f0f0f4;
    --bg-hover: #e8e8ee;
    --border-color: rgba(0, 0, 0, 0.08);
    --text-primary: #1a1a2e;
    --text-secondary: #555566;
    --text-muted: #999aaa;
    --accent: #7c5cff;
    --accent-hover: #6a48e8;
    --accent-glow: rgba(124, 92, 255, 0.1);
    --user-bubble: transparent;
    --assistant-bubble: transparent;
    --green: #22c55e;
    --red: #ef4444;
    --recording-red: #ef4444;

    /* Layout */
    --max-content-width: 720px;
    --header-height: 56px;
    --input-area-min: 64px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100dvh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ================================================
   SCREENS
   ================================================ */
.screen {
    display: none;
    height: 100dvh;
}
.screen.active {
    display: flex;
    flex-direction: column;
}

/* ================================================
   LOGIN
   ================================================ */
.login-container {
    margin: auto;
    text-align: center;
    padding: 2rem;
    width: 100%;
    max-width: 360px;
}

.login-avatar {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { filter: brightness(1); transform: scale(1); }
    50% { filter: brightness(1.3); transform: scale(1.05); }
}

.login-title {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 0.25rem;
}

.login-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

#login-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

#password-input {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 16px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition-fast);
}

#password-input:focus {
    border-color: var(--accent);
}

.btn-login {
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 14px;
    font-size: 1rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.btn-login:hover {
    background: var(--accent-hover);
}

.error-text {
    color: var(--red);
    font-size: 0.85rem;
    min-height: 1.2em;
}

/* ================================================
   CHAT LAYOUT
   ================================================ */
#chat-screen {
    position: relative;
}

/* Header */
.chat-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-primary);
    flex-shrink: 0;
    z-index: 10;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.avatar-small {
    position: relative;
    font-size: 1.5rem;
    line-height: 1;
}

.avatar-dot {
    display: none; /* Moved to status line */
}

.avatar-dot.offline {
    background: var(--text-muted);
}

.header-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
}

.status-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.status-text.online::before {
    content: '';
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--green);
    display: inline-block;
    flex-shrink: 0;
}

.status-text.online {
    color: var(--green);
}

.header-actions {
    display: flex;
    gap: 0.25rem;
}

.header-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
}

.header-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.header-btn.active {
    color: var(--accent);
}

/* ================================================
   MESSAGES AREA — Antigravity-style centered
   ================================================ */
.messages-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

.messages {
    max-width: var(--max-content-width);
    margin: 0 auto;
    padding: 1.5rem 1rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    min-height: 100%;
    justify-content: flex-end;
}

/* Individual message */
.message {
    display: flex;
    flex-direction: column;
    animation: msg-in 0.3s ease;
}

@keyframes msg-in {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.message.history-msg {
    animation: none;
}

.message.user {
    align-items: flex-start;
}

.message.assistant {
    align-items: flex-start;
}

.message-content {
    max-width: 100%;
    padding: 0;
    font-size: 0.938rem;
    line-height: 1.6;
    word-wrap: break-word;
    overflow-wrap: break-word;
    text-align: justify;
}

.message.user .message-content {
    color: var(--text-primary);
    background: var(--bg-surface);
    padding: 12px 16px;
    border-radius: 12px;
}

.message.assistant .message-content {
    background: transparent;
    padding-left: 0;
    padding-right: 0;
    max-width: 100%;
    color: var(--text-primary);
}

/* Markdown in assistant messages */
.message.assistant .message-content p {
    margin-bottom: 0.75em;
}

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

.message.assistant .message-content code {
    background: var(--bg-surface);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

.message.assistant .message-content pre {
    background: var(--bg-surface);
    border-radius: 8px;
    padding: 12px 16px;
    overflow-x: auto;
    margin: 0.5em 0;
}

.message.assistant .message-content pre code {
    background: transparent;
    padding: 0;
}

.message.assistant .message-content ul,
.message.assistant .message-content ol {
    padding-left: 1.5em;
    margin-bottom: 0.75em;
}

.message.assistant .message-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 12px;
    color: var(--text-secondary);
    margin: 0.5em 0;
}

.message.assistant .message-content a {
    color: var(--accent);
    text-decoration: none;
}

.message.assistant .message-content a:hover {
    text-decoration: underline;
}

.message.assistant .message-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

.message-time {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 2px;
    padding: 0 4px;
}

.message-sender {
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.message.user .message-sender {
    color: var(--green);
}

.message.assistant .message-sender {
    color: var(--accent);
}

/* Date separator */
.date-separator {
    text-align: center;
    padding: 0.75rem 0;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.05em;
}

/* Typing indicator */
.typing-indicator {
    max-width: var(--max-content-width);
    margin: 0 auto;
    padding: 0.5rem 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.typing-indicator.hidden {
    display: none;
}

.typing-dots {
    display: flex;
    gap: 3px;
}

.typing-dots span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-muted);
    animation: typing-bounce 1.4s infinite ease-in-out;
}

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

@keyframes typing-bounce {
    0%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-6px); }
}

/* File attachment indicator */
.file-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-surface);
    border-radius: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.file-indicator svg {
    flex-shrink: 0;
}

/* Scroll to bottom button */
.scroll-to-bottom {
    position: absolute;
    bottom: var(--input-area-min);
    left: 50%;
    transform: translateX(-50%);
    margin-bottom: 12px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 5;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.scroll-to-bottom:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.scroll-to-bottom.hidden {
    display: none;
}

/* Drop overlay */
.drop-overlay {
    position: absolute;
    inset: var(--header-height) 0 0 0;
    background: rgba(10, 10, 15, 0.9);
    border: 2px dashed var(--accent);
    border-radius: 12px;
    margin: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 20;
    backdrop-filter: blur(4px);
}

.drop-overlay.hidden {
    display: none;
}

.drop-content {
    text-align: center;
    color: var(--accent);
}

.drop-content p {
    margin-top: 8px;
    font-size: 1.1rem;
    font-weight: 500;
}

/* ================================================
   INPUT AREA
   ================================================ */
.input-area {
    padding: 8px 1rem 12px;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.input-wrapper {
    max-width: var(--max-content-width);
    margin: 0 auto;
    display: flex;
    align-items: flex-end;
    gap: 4px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 4px 4px 4px 8px;
    transition: border-color var(--transition-fast);
}

.input-wrapper:focus-within {
    border-color: rgba(124, 92, 255, 0.3);
}

#message-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 0.938rem;
    font-family: inherit;
    line-height: 1.5;
    padding: 8px 4px;
    resize: none;
    outline: none;
    min-height: 24px;
    max-height: 200px;
}

#message-input::placeholder {
    color: var(--text-muted);
}

.input-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 8px;
    border-radius: 10px;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

#mic-btn {
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 10px;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

#mic-btn:hover {
    background: var(--accent-hover);
}

#mic-btn svg {
    width: 20px;
    height: 20px;
}
.btn-send {
    background: var(--accent);
    color: white;
    border: none;
    padding: 8px;
    border-radius: 10px;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0.4;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.btn-send.active {
    opacity: 1;
    cursor: pointer;
}

.btn-send.active:hover {
    background: var(--accent-hover);
}

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

/* ================================================
   MOBILE RESPONSIVE
   ================================================ */
@media (max-width: 640px) {
    :root {
        --max-content-width: 100%;
    }

    .messages {
        padding: 1rem 1rem;
        margin: 0 auto;
    }

    .input-area {
        padding: 6px 0.75rem 16px;
        padding-bottom: max(16px, env(safe-area-inset-bottom));
    }

    .message-content {
        max-width: 90%;
    }

    #mic-btn {
        width: 44px;
        height: 44px;
    }

    .btn-send {
        width: 44px;
        height: 44px;
    }
}

/* ================================================
   SCROLLBAR
   ================================================ */
.messages-container::-webkit-scrollbar {
    width: 6px;
}

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

.messages-container::-webkit-scrollbar-thumb {
    background: var(--bg-hover);
    border-radius: 3px;
}

.messages-container::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ================================================
   WELCOME MESSAGE
   ================================================ */
.welcome-message {
    text-align: center;
    padding: 2rem 0;
}

.welcome-message .welcome-emoji {
    font-size: 3rem;
    margin-bottom: 0.75rem;
}

.welcome-message h2 {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.welcome-message p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}