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

:root {
    --bg-primary: #13151a;
    --bg-secondary: #1a1d24;
    --bg-tertiary: #252a35;
    --bg-gradient: radial-gradient(ellipse at 50% 0%, rgba(99, 102, 241, 0.08) 0%, transparent 50%), linear-gradient(145deg, #13151a 0%, #1a1d24 50%, #151820 100%);
    --accent-primary: #818cf8;
    --accent-primary-hover: #6366f1;
    --accent-secondary: #a78bfa;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --text-primary: #f0f2f5;
    --text-secondary: #a0a8b8;
    --text-muted: #6b7280;
    --border-color: #2d3340;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.25);
    --card-bg: rgba(37, 42, 53, 0.85);
    --user-msg-bg: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
}

html, body {
    height: 100%;
}

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

.container {
    max-width: 900px;
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 0 1rem;
}

.header {
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
    margin: 0 -1rem;
    flex-shrink: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
}

.header-left {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
}

.clarity-logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.clarity-logo {
    height: clamp(24px, 4vw, 36px);
    width: auto;
    flex-shrink: 0;
}

.header-center {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.15rem;
    min-width: 0;
}

.pta-logo-link {
    display: flex;
    align-items: center;
    justify-content: center;
}

.pta-logo {
    height: clamp(32px, 6vw, 50px);
    width: auto;
    filter: brightness(0) invert(1);
    flex-shrink: 0;
    object-fit: contain;
}

.trust-subtitle {
    color: var(--accent-primary);
    font-size: clamp(10px, 2vw, 14px);
    font-weight: 500;
    margin: 0;
    white-space: nowrap;
}

.header-right {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background: var(--bg-tertiary);
    padding: 0.35rem 0.5rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.lang-btn:hover {
    color: var(--text-secondary);
}

.lang-btn.active {
    background: var(--accent-gradient);
    color: white;
}

.lang-divider {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    min-height: 0;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 0;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-height: 0;
}

.message {
    display: flex;
    gap: 0.75rem;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.message.user {
    justify-content: flex-end;
}

.message-content {
    max-width: 85%;
    padding: 1rem 1.25rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-soft);
}

.message.assistant .message-content {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-bottom-left-radius: 4px;
    color: var(--text-primary);
}

.message.user .message-content {
    background: var(--user-msg-bg);
    color: #1a1d21;
    border-bottom-right-radius: 4px;
    font-weight: 500;
}

/* Question header - deprecated but kept for backwards compatibility */
.question-header {
    display: none;
}

.answer-text p {
    margin-bottom: 0.5rem;
}

.answer-text p:last-of-type {
    margin-bottom: 0;
}

.message-content .section-header {
    font-weight: 600;
    color: var(--accent-primary);
    margin-top: 0.75rem;
    margin-bottom: 0.25rem;
}

.message-content .general-guidance,
.message-content li.general-guidance {
    font-style: italic;
    color: var(--text-secondary);
}

.message-content ul {
    margin-left: 1rem;
    margin-bottom: 0.5rem;
}

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

/* Starter chips (empty state) */
.starter-chips {
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.starter-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.starter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.starter-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
    padding: 0.5rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.starter-btn:hover {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
}

/* Follow-up buttons */
.followups {
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.followups-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.followup-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.followup-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
    padding: 0.5rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.followup-btn:hover {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
}

/* Contact section (for not-in-docs) */
.contact-section {
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.contact-toggle {
    background: none;
    border: none;
    color: var(--accent-blue);
    cursor: pointer;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0;
    font-weight: 500;
}

.contact-toggle:hover {
    color: var(--accent-primary);
}

.contact-toggle svg {
    transition: transform 0.2s;
}

.contact-toggle.open svg {
    transform: rotate(180deg);
}

.contact-content {
    display: none;
    margin-top: 0.5rem;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.contact-content.open {
    display: block;
}

.contact-content p {
    margin-bottom: 0.25rem;
}

.contact-content a {
    color: var(--accent-primary);
}

.contact-note {
    margin-top: 0.5rem;
    font-style: italic;
    color: var(--text-muted);
}

/* Sources section (collapsible) */
.sources {
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.sources-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0;
}

.sources-toggle:hover {
    color: var(--accent-primary);
}

.sources-toggle svg {
    transition: transform 0.2s;
}

.sources-toggle.open svg {
    transform: rotate(180deg);
}

.sources-list {
    display: none;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.sources-list.open {
    display: block;
}

.source-item {
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
}

.source-item:last-child {
    margin-bottom: 0;
}

.source-title {
    font-weight: 600;
    color: var(--accent-secondary);
    font-size: 0.8rem;
}

.source-snippet {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
    font-style: italic;
}

/* Jump to latest button */
.jump-to-latest {
    position: absolute;
    bottom: 140px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-gradient);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
    z-index: 10;
}

.jump-to-latest.visible {
    opacity: 1;
    visibility: visible;
}

.jump-to-latest:hover {
    filter: brightness(1.1);
}

/* Sticky input area */
.input-area {
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
    padding: 0.75rem 0;
    flex-shrink: 0;
    position: sticky;
    bottom: 0;
}

.mode-toggle {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    justify-content: center;
}

.mode-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.4rem 0.8rem;
    border-radius: 1.5rem;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.mode-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.mode-btn.active {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
    font-weight: 500;
}

.transcript-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.4rem 0.8rem;
    border-radius: 1.5rem;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.transcript-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.transcript-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.input-form {
    display: flex;
    gap: 0.75rem;
}

#question-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 1.5rem;
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
    resize: none;
    min-height: 46px;
    max-height: 160px;
    line-height: 1.4;
    overflow-y: auto;
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

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

#send-btn {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--accent-gradient);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.1s, filter 0.2s;
    flex-shrink: 0;
}

#send-btn:hover {
    filter: brightness(1.1);
}

#send-btn:active {
    transform: scale(0.95);
}

#send-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
}

.footer {
    padding: 0.75rem 0;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    flex-shrink: 0;
}

.footer .trillage-link {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer .trillage-link:hover {
    color: var(--accent-secondary);
    text-decoration: underline;
}

.loading {
    display: flex;
    gap: 0.5rem;
    padding: 0.5rem;
}

.loading-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: bounce 1.4s ease-in-out infinite both;
}

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

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

.error {
    color: #f87171;
    padding: 0.5rem;
    background: rgba(248, 113, 113, 0.1);
    border-radius: 0.5rem;
}

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

.message.assistant .message-content strong {
    color: var(--accent-primary) !important;
}

.message.assistant .message-content li strong {
    color: var(--accent-primary) !important;
}

.message-content em {
    font-style: italic;
}

.message-content ul, .message-content ol {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

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

/* Resource Card Styles */
.resource-card {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(139, 92, 246, 0.1) 100%);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 0.75rem;
    padding: 1rem;
    margin-bottom: 1rem;
}

.resource-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.resource-icon {
    font-size: 1.25rem;
}

.resource-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.resource-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
}

.resource-open-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--accent-gradient);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.resource-open-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.resource-local-note {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-style: italic;
}

.resource-source-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    transition: color 0.2s ease;
}

.resource-source-toggle:hover {
    color: var(--text-primary);
}

.resource-source-toggle svg {
    transition: transform 0.2s ease;
}

.resource-source-toggle.open svg {
    transform: rotate(180deg);
}

.resource-source-content {
    display: none;
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 0.375rem;
    width: 100%;
}

.resource-source-content.open {
    display: block;
}

.resource-source-content a {
    color: var(--accent-primary);
    font-size: 0.8rem;
    word-break: break-all;
}

@media (max-width: 600px) {
    .message-content {
        max-width: 92%;
    }
    
    .header {
        padding: 0.4rem 0.5rem;
        gap: 0.4rem;
    }
    
    .lang-toggle {
        padding: 0.2rem 0.3rem;
    }
    
    .lang-btn {
        font-size: 0.7rem;
        padding: 0.15rem 0.3rem;
    }
    
    .mode-toggle {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.4rem;
    }
    
    .mode-btn {
        padding: 0.35rem 0.6rem;
        font-size: 0.75rem;
    }
    
    .transcript-btn {
        padding: 0.35rem 0.6rem;
        font-size: 0.75rem;
    }
    
    #question-input {
        font-size: 0.9rem;
        padding: 0.6rem 0.75rem;
    }
    
    #question-input::placeholder {
        font-size: 0.85rem;
    }
    
    .followup-btn {
        width: 100%;
    }
    
    .jump-to-latest {
        bottom: 130px;
    }
    
    .resource-actions {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .starter-btn {
        font-size: 0.8rem;
        padding: 0.4rem 0.6rem;
    }
    
    .container {
        padding: 0 0.5rem;
    }
}