/* ===================================================================
   Personal Finance Assistant ??? Premium Dark Theme
   =================================================================== */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a2e;
    --bg-card: rgba(26, 26, 46, 0.6);
    --bg-input: rgba(26, 26, 46, 0.8);
    --bg-hover: rgba(99, 102, 241, 0.08);
    --bg-glass: rgba(255, 255, 255, 0.03);

    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --text-accent: #a78bfa;

    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-glow: rgba(99, 102, 241, 0.3);
    --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #a78bfa);

    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --error: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.1);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.1);

    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(99, 102, 241, 0.3);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --header-height: 60px;
    --input-height: 80px;
    --max-width: 820px;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--accent-glow);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
    height: 100vh;
}

/* --- Layout --- */
#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background: 
        radial-gradient(ellipse 80% 60% at 50% 0%, rgba(99, 102, 241, 0.08), transparent),
        radial-gradient(ellipse 60% 50% at 100% 100%, rgba(139, 92, 246, 0.05), transparent),
        var(--bg-primary);
}

/* --- Header --- */
.app-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    flex-shrink: 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    display: flex;
    align-items: center;
    filter: drop-shadow(0 0 8px var(--accent-glow));
}

.header-title h1 {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.header-badge {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent-secondary);
    background: rgba(139, 92, 246, 0.12);
    padding: 2px 8px;
    border-radius: 4px;
    margin-left: 8px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 6px var(--success);
    animation: pulse-dot 2s infinite;
}

.status-dot.error {
    background: var(--error);
    box-shadow: 0 0 6px var(--error);
}

.status-dot.loading {
    background: var(--warning);
    box-shadow: 0 0 6px var(--warning);
    animation: pulse-dot 0.8s infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* --- Chat Container --- */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    scroll-behavior: smooth;
}

.chat-container::-webkit-scrollbar {
    width: 6px;
}

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

.chat-container::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

.chat-container::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* --- Welcome Screen --- */
.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 60px 24px;
    max-width: 640px;
    margin: 0 auto;
    animation: fadeInUp 0.6s ease-out;
}

.welcome-screen.hidden {
    display: none;
}

.welcome-icon {
    margin-bottom: 24px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.welcome-screen h2 {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 12px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-screen p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 480px;
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    width: 100%;
    max-width: 480px;
}

.quick-action-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-smooth);
    text-align: left;
}

.quick-action-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.qa-icon {
    font-size: 1.3rem;
}

/* --- Messages --- */
.messages-list {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.message {
    display: flex;
    gap: 12px;
    animation: fadeInUp 0.3s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
    flex-shrink: 0;
    margin-top: 2px;
}

.message.user .message-avatar {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
}

.message.assistant .message-avatar {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 0 12px var(--accent-glow);
}

.message-content {
    max-width: 85%;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

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

.message-bubble {
    padding: 14px 18px;
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    line-height: 1.7;
    word-wrap: break-word;
    position: relative;
}

.message.user .message-bubble {
    background: linear-gradient(135deg, #4f46e5, #6366f1);
    color: white;
    border-bottom-right-radius: 4px;
}

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

.message-bubble p {
    margin-bottom: 8px;
}

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

.message-bubble strong {
    color: var(--text-accent);
    font-weight: 600;
}

.message-bubble ul, .message-bubble ol {
    padding-left: 20px;
    margin: 8px 0;
}

.message-bubble li {
    margin-bottom: 4px;
}

.message-bubble code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: rgba(99, 102, 241, 0.15);
    padding: 2px 6px;
    border-radius: 4px;
}

.message-bubble em {
    color: var(--text-secondary);
    font-style: italic;
}

/* --- Typing Indicator --- */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 8px 4px;
}

.typing-indicator span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-primary);
    animation: bounce-dot 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 bounce-dot {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1); opacity: 1; }
}

/* --- Chain of Thought (CoT) Accordion --- */
.cot-container {
    margin-top: 4px;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.cot-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: rgba(99, 102, 241, 0.06);
    border: 1px solid rgba(99, 102, 241, 0.12);
    border-radius: var(--radius-sm);
    color: var(--text-accent);
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    width: 100%;
    text-align: left;
}

.cot-toggle:hover {
    background: rgba(99, 102, 241, 0.1);
    border-color: rgba(99, 102, 241, 0.25);
}

.cot-toggle .cot-chevron {
    transition: transform var(--transition-fast);
    font-size: 0.7rem;
}

.cot-toggle.expanded .cot-chevron {
    transform: rotate(90deg);
}

.cot-count {
    background: var(--accent-primary);
    color: white;
    font-size: 0.65rem;
    padding: 1px 6px;
    border-radius: 10px;
    font-weight: 600;
}

.cot-entries {
    max-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.cot-entries.expanded {
    max-height: 500px;
}

.cot-entries::-webkit-scrollbar {
    width: 4px;
}

.cot-entries::-webkit-scrollbar-track {
    background: transparent;
}

.cot-entries::-webkit-scrollbar-thumb {
    background: rgba(99, 102, 241, 0.3);
    border-radius: 2px;
}

.cot-entries::-webkit-scrollbar-thumb:hover {
    background: rgba(99, 102, 241, 0.5);
}

.cot-entry {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 14px;
    border-left: 2px solid var(--border);
    margin-left: 12px;
    animation: fadeIn 0.2s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.cot-entry:last-child {
    border-left-color: var(--accent-primary);
}

.cot-status-icon {
    font-size: 0.85rem;
    flex-shrink: 0;
    margin-top: 1px;
}

.cot-entry-content {
    flex: 1;
    min-width: 0;
}

.cot-agent-name {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.cot-action {
    font-size: 0.82rem;
    color: var(--text-primary);
    margin-top: 2px;
}

.cot-detail {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 2px;
    font-family: var(--font-mono);
    word-break: break-word;
}

.cot-timestamp {
    font-size: 0.68rem;
    color: var(--text-muted);
    flex-shrink: 0;
    font-family: var(--font-mono);
}

/* Status-specific styling */
.cot-entry[data-status="running"] {
    border-left-color: var(--warning);
}

.cot-entry[data-status="complete"] {
    border-left-color: var(--success);
}

.cot-entry[data-status="error"] {
    border-left-color: var(--error);
}

/* --- Feedback Buttons --- */
.feedback-actions {
    display: flex;
    gap: 4px;
    margin-top: 4px;
}

.feedback-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    transition: all var(--transition-fast);
    opacity: 0.5;
}

.feedback-btn:hover {
    opacity: 1;
    background: var(--bg-hover);
    transform: scale(1.15);
}

.feedback-btn.active {
    opacity: 1;
}

.feedback-btn.thumbs-up.active {
    color: var(--success);
    background: var(--success-bg);
}

.feedback-btn.thumbs-down.active {
    color: var(--error);
    background: var(--error-bg);
}

/* --- Input Area --- */
.input-area {
    padding: 16px 24px;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

.input-wrapper {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: flex-end;
    gap: 10px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 6px 6px 6px 16px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-wrapper:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-wrapper textarea {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    resize: none;
    line-height: 1.5;
    padding: 8px 0;
    max-height: 120px;
}

.input-wrapper textarea::placeholder {
    color: var(--text-muted);
}

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

.send-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-glow);
}

.send-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.input-footer {
    max-width: var(--max-width);
    margin: 8px auto 0;
    text-align: center;
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* --- Feedback Modal --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-smooth);
}

.modal-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 440px;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-spring);
}

.modal-overlay.visible .modal-content {
    transform: scale(1) translateY(0);
}

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

.modal-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.3rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.modal-body {
    padding: 20px 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.feedback-score-display {
    text-align: center;
    font-size: 2rem;
    padding: 8px;
}

.modal-body textarea {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    resize: none;
    outline: none;
    transition: border-color var(--transition-fast);
}

.modal-body textarea:focus {
    border-color: var(--accent-primary);
}

.feedback-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.category-chip {
    cursor: pointer;
}

.category-chip input {
    display: none;
}

.category-chip span {
    display: inline-block;
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.category-chip input:checked + span {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--accent-primary);
    color: var(--text-accent);
}

.category-chip:hover span {
    border-color: var(--border-hover);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 16px 24px;
    border-top: 1px solid var(--border);
}

.btn-secondary {
    padding: 8px 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
}

.btn-primary {
    padding: 8px 20px;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--accent-gradient);
    color: white;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}

/* --- Responsive --- */
@media (max-width: 640px) {
    .app-header {
        padding: 0 16px;
    }

    .header-title h1 {
        font-size: 0.95rem;
    }

    .chat-container {
        padding: 16px;
    }

    .quick-actions {
        grid-template-columns: 1fr;
    }

    .message-content {
        max-width: 92%;
    }

    .input-area {
        padding: 12px 16px;
    }
}

/* --- Loading Shimmer --- */
.shimmer {
    background: linear-gradient(90deg, var(--bg-card) 25%, rgba(99, 102, 241, 0.08) 50%, var(--bg-card) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* --- Toast Notifications --- */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 10px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.85rem;
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    opacity: 0;
    transition: all var(--transition-smooth);
    pointer-events: none;
}

.toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.success {
    border-color: var(--success);
}

.toast.error {
    border-color: var(--error);
}