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

:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --bg-tertiary: #3a3a3a;
    --text-primary: #ffb000;
    --text-secondary: #ffcc00;
    --text-muted: #888;
    --border-color: #444;
    --user-msg-bg: #ffb000;
    --user-msg-text: #1a1a1a;
    --assistant-msg-bg: #2a2a2a;
    --assistant-msg-text: #ffb000;
    
    --btn-size: clamp(40px, 10vw, 48px);
    --gap: clamp(0.4rem, 2vw, 0.75rem);
    --padding: clamp(0.5rem, 2vw, 1rem);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    max-width: 100%;
    margin: 0 auto;
}

header {
    background: var(--bg-secondary);
    padding: var(--padding);
    padding-top: calc(var(--padding) + env(safe-area-inset-top));
    border-bottom: 2px solid var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

.logo {
    font-size: clamp(1.2rem, 4vw, 1.5rem);
    font-weight: bold;
    color: var(--text-primary);
    letter-spacing: 0.2em;
}

.status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: clamp(0.8rem, 3vw, 0.9rem);
}

#connection-status {
    color: var(--text-muted);
    font-size: 1.2rem;
}

#connection-status.connected {
    color: #00ff00;
}

#connection-status.error {
    color: #ff0000;
}

main {
    flex: 1;
    overflow-y: auto;
    padding: var(--padding);
    background: var(--bg-primary);
    -webkit-overflow-scrolling: touch;
    min-height: 0;
}

#messages {
    display: flex;
    flex-direction: column;
    gap: var(--gap);
}

.message {
    max-width: 85%;
    padding: clamp(0.6rem, 2vw, 0.75rem) clamp(0.8rem, 3vw, 1rem);
    border-radius: 12px;
    word-wrap: break-word;
    line-height: 1.5;
    font-size: clamp(0.9rem, 3.5vw, 1rem);
}

.message.user {
    align-self: flex-end;
    background: var(--user-msg-bg);
    color: var(--user-msg-text);
    border-bottom-right-radius: 4px;
}

.message.assistant {
    align-self: flex-start;
    background: var(--assistant-msg-bg);
    color: var(--assistant-msg-text);
    border-bottom-left-radius: 4px;
}

.message.system {
    align-self: center;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-style: italic;
}

footer {
    background: var(--bg-secondary);
    padding: var(--padding);
    padding-bottom: calc(var(--padding) + env(safe-area-inset-bottom));
    border-top: 2px solid var(--text-primary);
    flex-shrink: 0;
}

.file-preview-container {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
    margin-bottom: var(--gap);
    max-height: 100px;
    overflow-y: auto;
}

.file-preview-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.file-preview-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.4rem;
    max-width: 150px;
}

.file-preview-item img {
    width: 50px;
    height: 50px;
    object-fit: cover;
    border-radius: 4px;
}

.file-preview-item .file-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 0.7rem;
    text-align: center;
    word-break: break-all;
}

.file-preview-item .file-info {
    flex: 1;
    min-width: 0;
}

.file-preview-item .file-name {
    font-size: 0.8rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-preview-item .file-size {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.file-preview-item .remove-file {
    position: absolute;
    top: -6px;
    right: -6px;
    width: 18px;
    height: 18px;
    background: #ff0000;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    line-height: 1;
    padding: 0;
}

.input-container {
    display: flex;
    gap: var(--gap);
    align-items: flex-end;
    width: 100%;
}

.control-btn {
    background: var(--bg-tertiary);
    border: 2px solid var(--text-primary);
    color: var(--text-primary);
    width: var(--btn-size);
    height: var(--btn-size);
    min-width: var(--btn-size);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
    padding: 0;
}

.control-btn svg {
    width: clamp(18px, 5vw, 22px);
    height: clamp(18px, 5vw, 22px);
    flex-shrink: 0;
}

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

.control-btn:active {
    transform: scale(0.95);
}

.control-btn.recording {
    background: #ff0000;
    border-color: #ff0000;
    color: white;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

#message-input {
    flex: 1;
    min-width: 0;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    padding: clamp(0.5rem, 2vw, 0.75rem);
    border-radius: 12px;
    font-size: clamp(14px, 4vw, 16px);
    resize: none;
    max-height: 120px;
    font-family: inherit;
    line-height: 1.4;
}

#message-input:focus {
    outline: none;
    border-color: var(--text-primary);
}

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

.message.file {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.message.file .file-attachment {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.5rem;
    border-radius: 8px;
}

.message.file .file-attachment img {
    max-width: 150px;
    max-height: 150px;
    border-radius: 4px;
    cursor: pointer;
}

.message.file .file-attachment .file-icon-large {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 4px;
    font-size: 0.8rem;
}

.message.file .file-attachment .file-details {
    flex: 1;
}

.message.file .file-attachment .file-details .name {
    font-weight: bold;
    font-size: 0.9rem;
}

.message.file .file-attachment .file-details .size {
    font-size: 0.75rem;
    opacity: 0.7;
}

@media (max-width: 380px) {
    .message {
        max-width: 90%;
    }
    
    .file-preview-item {
        max-width: 130px;
    }
    
    .file-preview-item img,
    .file-preview-item .file-icon {
        width: 40px;
        height: 40px;
    }
}

@media (min-width: 768px) {
    #app {
        max-width: 800px;
    }
    
    .message {
        max-width: 70%;
    }
}

@media (min-width: 1024px) {
    #app {
        max-width: 1000px;
    }
    
    .message {
        max-width: 60%;
    }
}