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

:root {
    --bg: #0a0a0a;
    --surface: #141414;
    --surface-hover: #1a1a1a;
    --border: #2a2a2a;
    --text: #e5e5e5;
    --text-muted: #888;
    --accent: #3b82f6;
    --accent-hover: #2563eb;

    --font-size-sm: clamp(13px, 0.9vw, 15px);
    --font-size-base: clamp(14px, 1vw, 17px);
    --font-size-lg: clamp(18px, 1.3vw, 22px);

    --spacing-sm: clamp(8px, 0.6vw, 12px);
    --spacing-md: clamp(12px, 1vw, 20px);
    --spacing-lg: clamp(16px, 1.3vw, 28px);

    --radius-sm: clamp(6px, 0.5vw, 10px);
    --radius-md: clamp(8px, 0.6vw, 14px);
    --radius-lg: clamp(12px, 0.8vw, 18px);
}

body {
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    height: 100vh;
    display: flex;
    font-size: var(--font-size-base);
}

.login-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.login-overlay.visible {
    display: flex;
}

.login-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: clamp(24px, 2vw, 40px);
    width: clamp(300px, 25vw, 420px);
}

.login-box h1 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.login-box input {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-md);
}

.login-box input:focus {
    outline: none;
    border-color: var(--accent);
}

.login-box button {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--accent);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: background 0.2s;
}

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

.login-error {
    color: #ef4444;
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-md);
    display: none;
}

.sidebar {
    width: clamp(240px, 18vw, 360px);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.new-chat-btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--accent);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: background 0.2s;
}

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

.chat-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.chat-item {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.15s;
}

.chat-item:hover {
    background: var(--surface-hover);
}

.chat-item.active {
    background: var(--surface-hover);
    color: var(--text);
}

.chat-item-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chat-item-delete {
    opacity: 0;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    font-size: var(--font-size-base);
    line-height: 1;
}

.chat-item:hover .chat-item-delete {
    opacity: 1;
}

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.header select {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: var(--font-size-sm);
    cursor: pointer;
}

.header select:focus {
    outline: none;
    border-color: var(--accent);
}

.aspect-ratio-select {
    display: none;
}

.aspect-ratio-select.visible {
    display: block;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg) clamp(20px, 5vw, 80px);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.message {
    max-width: clamp(500px, 70%, 1000px);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    line-height: 1.6;
}

.message.user {
    align-self: flex-end;
    background: var(--accent);
    color: white;
}

.message.assistant {
    align-self: flex-start;
    background: var(--surface);
    border: 1px solid var(--border);
}

.input-area {
    padding: var(--spacing-md) clamp(20px, 5vw, 80px);
    border-top: 1px solid var(--border);
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-end;
    max-width: 1200px;
    margin: 0 auto;
}

.input-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.image-preview {
    display: none;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.image-preview.has-images {
    display: flex;
}

.preview-item {
    position: relative;
}

.preview-item img {
    width: clamp(50px, 5vw, 80px);
    height: clamp(50px, 5vw, 80px);
    object-fit: cover;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.preview-item button {
    position: absolute;
    top: -6px;
    right: -6px;
    width: clamp(16px, 1.2vw, 22px);
    height: clamp(16px, 1.2vw, 22px);
    border-radius: 50%;
    background: #ef4444;
    border: none;
    color: white;
    font-size: clamp(10px, 0.8vw, 14px);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.input-row {
    display: flex;
    gap: var(--spacing-sm);
}

.attach-btn {
    padding: var(--spacing-md);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.15s;
    font-size: var(--font-size-base);
}

.attach-btn:hover {
    background: var(--surface-hover);
    color: var(--text);
}

#message-input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text);
    font-size: var(--font-size-base);
    resize: none;
    min-height: clamp(44px, 3.5vw, 56px);
    max-height: clamp(100px, 10vw, 160px);
}

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

.send-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--accent);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: background 0.2s;
}

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

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

.hidden {
    display: none !important;
}

.loading-indicator {
    display: flex;
    gap: 4px;
    padding: var(--spacing-md) var(--spacing-lg);
}

.loading-indicator span {
    width: clamp(6px, 0.5vw, 10px);
    height: clamp(6px, 0.5vw, 10px);
    background: var(--text-muted);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out both;
}

.loading-indicator span:nth-child(1) {
    animation-delay: -0.32s;
}
.loading-indicator span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes bounce {
    0%,
    80%,
    100% {
        transform: scale(0);
    }
    40% {
        transform: scale(1);
    }
}

.message.generating {
    position: relative;
    overflow: hidden;
}

.message.generating::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.08),
        transparent
    );
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

#send-btn.stop-mode {
    background: #ef4444;
    border-color: #ef4444;
}

#send-btn.stop-mode:hover {
    background: #dc2626;
    border-color: #dc2626;
}

.image-wrapper {
    position: relative;
    display: inline-block;
    margin: var(--spacing-sm) 0;
}

.image-wrapper img {
    max-width: clamp(250px, 30vw, 500px);
    max-height: clamp(250px, 30vw, 500px);
    object-fit: contain;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: opacity 0.15s;
}

.image-wrapper:hover img {
    opacity: 0.9;
}

.image-actions {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.15s;
}

.image-wrapper:hover .image-actions {
    opacity: 1;
}

.image-actions button {
    width: clamp(24px, 2vw, 36px);
    height: clamp(24px, 2vw, 36px);
    border: none;
    border-radius: var(--radius-sm);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    font-size: var(--font-size-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
}

.image-actions button:hover {
    background: rgba(0, 0, 0, 0.9);
}

.image-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-lg);
}

.image-modal-content {
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.image-modal-content img {
    max-width: 100%;
    max-height: calc(90vh - 80px);
    object-fit: contain;
    border-radius: var(--radius-md);
}

.image-modal-actions {
    display: flex;
    gap: var(--spacing-md);
}

.image-modal-actions button {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: background 0.15s;
}

.image-modal-actions button:first-child {
    background: var(--accent);
    color: white;
}

.image-modal-actions button:first-child:hover {
    background: var(--accent-hover);
}

.image-modal-actions button:last-child {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}

.image-modal-actions button:last-child:hover {
    background: var(--surface-hover);
}