/* Reset and base styles */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0d0b11;
    --bg-secondary: #1a1525;
    --bg-tertiary: #241e30;
    --text-primary: #e8e4f0;
    --text-secondary: #9589a8;
    --accent-blue: #a855f7;
    --accent-blue-dark: #7c3aed;
    --border-color: #2d2640;
    --user-bubble: #7c3aed;
    --assistant-bubble: #1a1525;
    --nav-height: 60px;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

/* Chat container */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    padding-top: var(--nav-height);
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Message bubbles */
.message {
    max-width: 80%;
    padding: 0.75rem 1rem;
    border-radius: 1rem;
    font-size: 0.95rem;
    line-height: 1.5;
    word-wrap: break-word;
    animation: fadeIn 0.3s ease;
}

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

.message-user {
    align-self: flex-end;
    background-color: var(--user-bubble);
    color: #ffffff;
    border-bottom-right-radius: 0.25rem;
}

.message-assistant {
    align-self: flex-start;
    background-color: var(--assistant-bubble);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-bottom-left-radius: 0.25rem;
}

/* Markdown content inside assistant messages */
.message-assistant strong {
    font-weight: 600;
}

.message-assistant code {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 0.15rem 0.4rem;
    border-radius: 0.25rem;
    font-size: 0.85em;
    font-family: monospace;
}

.message-assistant ul {
    margin: 0.5rem 0;
    padding-left: 1.25rem;
    list-style: disc;
}

.message-assistant li {
    margin-bottom: 0.25rem;
}

.message-assistant p {
    margin-bottom: 0.75rem;
}

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

.message-assistant .block-title {
    display: block;
    margin-top: 0.5rem;
    margin-bottom: 0.25rem;
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0.75rem 1rem;
    background-color: var(--assistant-bubble);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    border-bottom-left-radius: 0.25rem;
    align-self: flex-start;
    animation: fadeIn 0.3s ease;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background-color: var(--text-secondary);
    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%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1); opacity: 1; }
}

/* Chat input */
.chat-input-container {
    padding: 1rem 1.5rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-primary);
}

.chat-form {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.chat-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

.chat-input:focus {
    border-color: var(--accent-blue);
}

.chat-input::placeholder {
    color: var(--text-secondary);
}

.send-button {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--accent-blue);
    border: none;
    border-radius: 0.75rem;
    color: #ffffff;
    cursor: pointer;
    transition: background-color 0.2s;
    flex-shrink: 0;
}

.send-button:hover {
    background-color: var(--accent-blue-dark);
}

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

/* Session limit message */
.session-limit {
    text-align: center;
    padding: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Error message */
.message-error {
    align-self: center;
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
    font-size: 0.85rem;
    text-align: center;
}

/* Projects page */
.projects-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: calc(var(--nav-height) + 2rem) 1.5rem 2rem;
}

.projects-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.projects-subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.5rem;
    transition: border-color 0.2s, transform 0.2s;
    color: var(--text-primary);
}

.project-card:visited {
    color: var(--text-primary);
}

.project-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

.project-name {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.private-badge {
    font-size: 0.7rem;
    font-weight: 500;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    padding: 0.15rem 0.5rem;
    border-radius: 0.25rem;
    margin-left: 0.5rem;
    vertical-align: middle;
    color: var(--text-secondary);
}

.loading-message {
    color: var(--text-secondary);
    grid-column: 1 / -1;
}

.project-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.25rem 0.6rem;
    border-radius: 0.375rem;
    font-size: 0.75rem;
    border: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    .chat-messages {
        padding: 1rem;
    }

    .message {
        max-width: 90%;
    }

    .chat-input-container {
        padding: 0.75rem 1rem 1rem;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .nav-container {
        padding: 0 1rem;
    }
}

/* Scrollbar styling */
.chat-messages::-webkit-scrollbar {
    width: 6px;
}

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

.chat-messages::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 3px;
}