@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap');

:root {
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    --border-color: #E5E7EB;
    --accent: #0D9488;
    --accent-hover: #0F766E;
    --user-bubble: #0D9488;
    --user-text: #FFFFFF;
    --sidebar-width: 280px;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: 150ms ease;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

.chat-app {
    display: flex;
    height: 100vh;
    width: 100vw;
}

.chat-sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100vh;
    transition: transform var(--transition), width var(--transition);
}

.sidebar-brand {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.brand-logo {
    height: 28px;
    width: auto;
    object-fit: contain;
}

.brand-chat-text {
    font-size: 28px;
    font-weight: 300;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.threads-list {
    flex: 1;
    overflow-y: auto;
    padding: 16px 12px;
}

.threads-section-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-tertiary);
    padding: 0 8px 12px;
}

.thread-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.thread-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color var(--transition);
}

.thread-item:hover {
    background-color: var(--bg-tertiary);
}

.thread-item.active {
    background-color: var(--bg-tertiary);
}

.thread-title {
    font-size: 14px;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.thread-topic-pill {
    display: inline-block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    background-color: var(--bg-primary);
    padding: 4px 10px;
    border-radius: 12px;
    width: fit-content;
}

.sidebar-navigation {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px 12px;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 12px;
    background: none;
    border: none;
    font-family: var(--font-family);
    font-size: 15px;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 8px;
    transition: all var(--transition);
    text-align: left;
}

.nav-item:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

.nav-item svg {
    flex-shrink: 0;
}

.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    min-width: 0;
    background-color: var(--bg-primary);
}

.chat-header {
    height: 56px;
    min-height: 56px;
    padding: 0 16px;
    display: flex;
    align-items: center;
    gap: 16px;
    background-color: var(--bg-primary);
    position: relative;
}

.mobile-menu-btn {
    display: none;
    padding: 8px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 8px;
    transition: background-color var(--transition);
}

.mobile-menu-btn:hover {
    background-color: var(--bg-tertiary);
}

.header-topic-selector {
    position: relative;
}

.custom-dropdown {
    position: relative;
}

.dropdown-trigger {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    font-family: var(--font-family);
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    background-color: transparent;
    border: 1px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.header-topic-selector .dropdown-trigger {
    gap: 12px;
    padding: 12px 18px;
    font-size: 24px;
    margin-top: 10px;
}

.dropdown-trigger:hover {
    color: var(--accent);
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
}

.dropdown-trigger.active {
    color: var(--accent);
    border-color: var(--border-color);
}

.dropdown-trigger svg {
    transition: transform var(--transition);
}

.dropdown-trigger.active svg {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 4px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    min-width: 180px;
    padding: 6px;
    display: none;
    z-index: 1000;
    max-height: 280px;
    overflow-y: auto;
}

.format-selector .dropdown-menu {
    top: auto;
    bottom: 100%;
    margin-top: 0;
    margin-bottom: 4px;
}

.format-selector .dropdown-trigger.active svg {
    transform: rotate(180deg);
}

.dropdown-menu.active {
    display: flex;
    flex-direction: column;
}

.dropdown-option {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 12px;
    background: none;
    border: none;
    font-family: var(--font-family);
    font-size: 14px;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 6px;
    transition: background-color var(--transition);
    text-align: left;
    white-space: nowrap;
}

.dropdown-option:hover {
    background-color: var(--bg-tertiary);
}

.dropdown-option.selected {
    color: var(--accent);
    font-weight: 500;
    background-color: rgba(13, 148, 136, 0.08);
}

.header-topic-select {
    appearance: none;
    padding: 6px 24px 6px 0;
    font-family: var(--font-family);
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
    background-color: transparent;
    border: none;
    cursor: pointer;
    transition: color var(--transition);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right center;
}

.header-topic-select:hover {
    color: var(--accent);
}

.header-topic-select:focus {
    outline: none;
}

.header-spacer {
    flex: 1;
}

.header-menu-btn {
    padding: 8px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 8px;
    transition: background-color var(--transition);
}

.header-menu-btn:hover {
    background-color: var(--bg-tertiary);
}

.header-dropdown {
    position: absolute;
    top: 48px;
    right: 16px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    min-width: 160px;
    padding: 6px;
    display: none;
    z-index: 100;
}

.header-dropdown.active {
    display: block;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 12px;
    background: none;
    border: none;
    font-family: var(--font-family);
    font-size: 14px;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 6px;
    transition: background-color var(--transition);
    text-align: left;
}

.dropdown-item:hover {
    background-color: var(--bg-tertiary);
}

.dropdown-item svg {
    color: var(--text-secondary);
}

.news-carousel-container {
    padding: 24px;
    background-color: var(--bg-primary);
}

.carousel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.carousel-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

.carousel-nav {
    display: flex;
    gap: 8px;
}

.carousel-arrow {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.carousel-arrow:hover:not(:disabled) {
    background-color: var(--bg-tertiary);
    border-color: var(--text-tertiary);
}

.carousel-arrow:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.carousel-track-container {
    overflow: hidden;
    margin: 0 -4px;
}

.carousel-track {
    display: flex;
    gap: 16px;
    transition: transform 0.3s ease;
    padding: 4px;
}

.news-card {
    flex: 0 0 320px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition);
}

.news-card:hover {
    border-color: var(--text-tertiary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.news-card-image {
    width: 100%;
    height: 160px;
    background-size: cover;
    background-position: center;
}

.news-card-content {
    padding: 16px;
}

.news-card-source {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-tertiary);
    margin-bottom: 8px;
}

.news-card-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card-text {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-top: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card-text-only {
    background-color: var(--bg-secondary);
}

.news-card-text-only .news-card-content-full {
    padding: 20px;
    min-height: 180px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.news-card-text-only .news-card-text {
    -webkit-line-clamp: 4;
}

.news-card-image-only .news-card-image {
    height: 200px;
}

.news-card-image-only .news-card-content {
    padding: 12px 16px;
}

.chat-transcript {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.empty-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px 24px;
}

.empty-state h2 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 32px;
}

.suggested-prompts {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, auto);
    gap: 12px;
    max-width: 700px;
}

.suggested-prompt {
    padding: 12px 20px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    font-family: var(--font-family);
    font-size: 14px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition);
}

.suggested-prompt:hover {
    border-color: var(--accent);
    background-color: rgba(13, 148, 136, 0.04);
}

.messages-container {
    display: none;
    flex-direction: column;
    gap: 32px;
    max-width: 768px;
    width: 100%;
    margin: 0 auto;
    padding: 32px 24px;
}

.messages-container.active {
    display: flex;
}

.empty-state.hidden {
    display: none;
}

.message {
    display: flex;
    flex-direction: column;
}

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

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

.message-bubble {
    max-width: 85%;
    padding: 14px 18px;
    border-radius: 20px;
    font-size: 15px;
    line-height: 1.6;
}

.message.user .message-bubble {
    background-color: var(--user-bubble);
    color: var(--user-text);
    border-bottom-right-radius: 6px;
}

.message.assistant .message-bubble {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-bottom-left-radius: 6px;
}

.message-bubble p {
    margin-bottom: 12px;
}

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

.message-bubble ul,
.message-bubble ol {
    margin: 12px 0;
    padding-left: 20px;
}

.message-bubble li {
    margin-bottom: 6px;
}

.message-bubble strong {
    font-weight: 600;
}

.message-bubble a {
    color: inherit;
    text-decoration: underline;
}

.message-bubble h1,
.message-bubble h2,
.message-bubble h3 {
    margin: 16px 0 8px;
    font-weight: 600;
}

.message-bubble h1 { font-size: 18px; }
.message-bubble h2 { font-size: 16px; }
.message-bubble h3 { font-size: 15px; }

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 14px 18px;
    background-color: var(--bg-secondary);
    border-radius: 20px;
    border-bottom-left-radius: 6px;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background-color: var(--text-tertiary);
    border-radius: 50%;
    animation: typingBounce 1.4s infinite ease-in-out;
}

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

@keyframes typingBounce {
    0%, 80%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    40% {
        transform: translateY(-6px);
        opacity: 1;
    }
}

.chat-composer {
    padding: 16px 24px 24px;
    background-color: var(--bg-primary);
}

.composer-wrapper {
    max-width: 768px;
    margin: 0 auto;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 8px 8px 8px 20px;
    display: flex;
    align-items: flex-end;
    gap: 12px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.composer-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
}

.message-input {
    flex: 1;
    min-height: 24px;
    max-height: 200px;
    padding: 10px 0;
    font-family: var(--font-family);
    font-size: 15px;
    color: var(--text-primary);
    background: none;
    border: none;
    resize: none;
    line-height: 1.5;
}

.message-input:focus {
    outline: none;
}

.message-input::placeholder {
    color: var(--text-tertiary);
}

.composer-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.format-selector {
    position: relative;
}

.format-select {
    padding: 8px 28px 8px 12px;
    font-family: var(--font-family);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    cursor: pointer;
    appearance: none;
    transition: all var(--transition);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
}

.format-select:hover {
    border-color: var(--text-tertiary);
}

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

.send-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    background-color: var(--accent-hover);
}

.send-btn:disabled {
    background-color: var(--bg-tertiary);
    color: var(--text-tertiary);
    cursor: not-allowed;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.3);
    z-index: 99;
}

.sidebar-overlay.active {
    display: block;
}

.share-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.3);
    z-index: 200;
    align-items: center;
    justify-content: center;
}

.share-modal.active {
    display: flex;
}

.share-modal-content {
    background-color: var(--bg-primary);
    border-radius: 16px;
    width: 90%;
    max-width: 400px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.share-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.share-modal-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.share-modal-close {
    padding: 8px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 8px;
    transition: background-color var(--transition);
}

.share-modal-close:hover {
    background-color: var(--bg-tertiary);
}

.share-modal-body {
    padding: 24px;
}

.share-modal-body p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.share-link-container {
    display: flex;
    gap: 12px;
}

.share-link-input {
    flex: 1;
    padding: 12px 14px;
    font-family: var(--font-family);
    font-size: 14px;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
}

.copy-link-btn {
    padding: 12px 20px;
    background-color: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: 10px;
    font-family: var(--font-family);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition);
}

.copy-link-btn:hover {
    background-color: var(--accent-hover);
}

@media (max-width: 768px) {
    .chat-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        transform: translateX(-100%);
        z-index: 100;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
    }

    .chat-sidebar.open {
        transform: translateX(0);
    }

    .mobile-menu-btn {
        display: flex;
    }

    .news-carousel-container {
        padding: 16px;
    }

    .news-card {
        flex: 0 0 280px;
    }

    .news-card-image {
        height: 140px;
    }

    .chat-composer {
        padding: 12px 16px 16px;
    }

    .composer-wrapper {
        padding: 6px 6px 6px 16px;
    }

    .messages-container {
        padding: 24px 16px;
    }

    .suggested-prompts {
        flex-direction: column;
    }

    .suggested-prompt {
        width: 100%;
    }
}