@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;900&display=swap');

:root {
    --black: #000000;
    --white: #ffffff;
    --gray-100: #f8f8f8;
    --gray-200: #eeeeee;
    --gray-300: #dddddd;
    --gray-400: #bbbbbb;
    --gray-500: #888888;
    --gray-600: #555555;
    --gray-700: #333333;
    --gray-800: #1a1a1a;
    --gray-900: #0a0a0a;

    --border-radius: 2px;
    --border-radius-lg: 4px;
    --transition: all 0.2s ease;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--white);
    color: var(--gray-900);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 20px;
}

header {
    text-align: center;
    margin-bottom: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--gray-200);
    position: relative;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
    color: var(--black);
}

header p {
    font-size: 1rem;
    color: var(--gray-600);
    font-weight: 400;
    letter-spacing: 0.01em;
}

.header-nav {
    margin-top: 20px;
}

.nav-btn {
    background: var(--white);
    color: var(--black);
    border: 2px solid var(--black);
    padding: 10px 20px;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-btn:hover {
    background: var(--black);
    color: var(--white);
}

.upload-section {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    margin-bottom: 40px;
}

.upload-area {
    border: 2px dashed var(--gray-300);
    border-radius: var(--border-radius);
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--gray-100);
    position: relative;
}

.upload-area:hover {
    border-color: var(--gray-700);
    background: var(--gray-200);
}

.upload-area.dragover {
    border-color: var(--black);
    background: var(--gray-200);
    border-style: solid;
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--gray-500);
    margin-bottom: 20px;
}

.upload-area h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--gray-900);
}

.upload-area p {
    color: var(--gray-600);
    font-size: 0.875rem;
    margin-bottom: 24px;
}

button {
    font-family: inherit;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
    font-size: 0.875rem;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.btn-primary {
    background: var(--black);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--gray-800);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-process {
    background: var(--black);
    color: var(--white);
    width: 100%;
    margin-top: 24px;
    padding: 16px;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
}

.btn-process:hover:not(:disabled) {
    background: var(--gray-800);
    box-shadow: var(--shadow-lg);
}

.btn-process:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    background: var(--gray-400);
}

.file-list {
    margin-top: 24px;
    display: grid;
    gap: 8px;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--gray-100);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
}

.file-item span {
    color: var(--gray-700);
    font-weight: 500;
}

.remove-file {
    background: transparent;
    color: var(--gray-600);
    padding: 4px 8px;
    font-size: 0.75rem;
    border: 1px solid var(--gray-300);
}

.remove-file:hover {
    background: var(--black);
    color: var(--white);
    border-color: var(--black);
}

.results-section {
    margin-top: 60px;
}

.results-section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 32px;
    letter-spacing: -0.01em;
}

.tabs {
    display: flex;
    gap: 0;
    margin-bottom: 32px;
    border-bottom: 1px solid var(--gray-200);
}

.tab-btn {
    background: transparent;
    color: var(--gray-600);
    padding: 12px 24px;
    border-radius: 0;
    border-bottom: 2px solid transparent;
    text-transform: none;
    letter-spacing: 0;
    font-weight: 500;
    font-size: 0.9375rem;
}

.tab-btn:hover {
    color: var(--gray-900);
    background: transparent;
}

.tab-btn.active {
    color: var(--black);
    border-bottom-color: var(--black);
    font-weight: 600;
}

.tab-content {
    padding: 32px 0;
}

.diagram-container {
    background: #ffffff;
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    min-height: 600px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: auto;
    box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.05);
}

#mermaidDiagram {
    width: 100%;
    max-width: 100%;
    background: #ffffff;
    padding: 20px;
    border-radius: var(--border-radius);
}

/* Mermaid node styles with colors */
#mermaidDiagram .node rect,
#mermaidDiagram .node polygon,
#mermaidDiagram .node circle,
#mermaidDiagram .node ellipse {
    stroke-width: 2px !important;
}

/* Default node style */
#mermaidDiagram .default rect,
#mermaidDiagram .default polygon,
#mermaidDiagram .default circle,
#mermaidDiagram .default ellipse {
    fill: #ffffff !important;
    stroke: #2563eb !important;
}

/* Greeting nodes */
#mermaidDiagram .greeting rect,
#mermaidDiagram .greeting polygon,
#mermaidDiagram .greeting circle,
#mermaidDiagram .greeting ellipse {
    fill: #dbeafe !important;
    stroke: #2563eb !important;
    stroke-width: 3px !important;
}

/* Verification nodes */
#mermaidDiagram .verification rect,
#mermaidDiagram .verification polygon {
    fill: #fef3c7 !important;
    stroke: #f59e0b !important;
}

/* Main process nodes */
#mermaidDiagram .main rect {
    fill: #ffffff !important;
    stroke: #2563eb !important;
}

/* Decision nodes */
#mermaidDiagram .decision polygon {
    fill: #f3e8ff !important;
    stroke: #9333ea !important;
}

/* Success nodes */
#mermaidDiagram .success rect,
#mermaidDiagram .success circle {
    fill: #d1fae5 !important;
    stroke: #10b981 !important;
}

/* Failure nodes */
#mermaidDiagram .failure rect,
#mermaidDiagram .failure circle {
    fill: #fee2e2 !important;
    stroke: #ef4444 !important;
}

/* Farewell nodes */
#mermaidDiagram .farewell rect,
#mermaidDiagram .farewell circle,
#mermaidDiagram .farewell ellipse {
    fill: #e0e7ff !important;
    stroke: #6366f1 !important;
}

#mermaidDiagram .node text {
    fill: #1e293b !important;
    font-family: 'Inter', sans-serif !important;
    font-weight: 600 !important;
    font-size: 14px !important;
}

#mermaidDiagram .edgeLabel {
    background-color: #ffffff !important;
    padding: 4px 8px !important;
    border-radius: 4px !important;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) !important;
}

#mermaidDiagram .edgeLabel text {
    fill: #4b5563 !important;
    font-size: 12px !important;
    font-weight: 600 !important;
    font-family: 'Inter', sans-serif !important;
}

#mermaidDiagram path.path {
    stroke: #6b7280 !important;
    stroke-width: 2px !important;
}

/* Highlight main flow path */
#mermaidDiagram .path-highlight {
    stroke: #2563eb !important;
    stroke-width: 3px !important;
}

#mermaidDiagram .arrowheadPath {
    fill: #6b7280 !important;
    stroke: #6b7280 !important;
}

.export-buttons {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    justify-content: center;
}

.btn-export {
    background: var(--white);
    color: var(--black);
    border: 2px solid var(--black);
    text-transform: none;
    font-weight: 600;
    font-size: 0.875rem;
}

.btn-export:hover {
    background: var(--black);
    color: var(--white);
    transform: none;
}

.prompts-container {
    display: grid;
    gap: 16px;
    max-height: 600px;
    overflow-y: auto;
    padding-right: 12px;
}

.prompts-container::-webkit-scrollbar {
    width: 4px;
}

.prompts-container::-webkit-scrollbar-track {
    background: var(--gray-100);
}

.prompts-container::-webkit-scrollbar-thumb {
    background: var(--gray-400);
}

.prompts-container::-webkit-scrollbar-thumb:hover {
    background: var(--gray-600);
}

.prompt-card {
    background: var(--white);
    padding: 24px;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    position: relative;
    transition: var(--transition);
}

.prompt-card:hover {
    border-color: var(--black);
    box-shadow: var(--shadow-md);
}

.prompt-card.global-instructions {
    background: var(--gray-100);
    border-left: 4px solid var(--black);
}

.prompt-card.error-handling {
    background: var(--gray-100);
    border-left: 4px solid var(--gray-600);
}

.prompt-card.node-type-greeting,
.prompt-card.node-type-question,
.prompt-card.node-type-decision,
.prompt-card.node-type-confirmation,
.prompt-card.node-type-farewell {
    border-left: 4px solid var(--black);
}

.prompt-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.prompt-card h4 {
    color: var(--black);
    margin: 0;
    font-size: 1rem;
    font-weight: 700;
    flex: 1;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.prompt-card .node-type {
    display: inline-block;
    padding: 4px 8px;
    background: var(--black);
    color: var(--white);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.prompt-card .speaker-badge {
    display: inline-block;
    background: var(--white);
    color: var(--gray-700);
    padding: 4px 8px;
    border: 1px solid var(--gray-300);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.prompt-card .prompt-text {
    background: var(--gray-100);
    padding: 16px;
    border-radius: var(--border-radius);
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--gray-800);
    margin-bottom: 16px;
    border-left: 3px solid var(--gray-400);
}

.prompt-card .examples,
.prompt-card .listen-for,
.prompt-card .next-actions,
.prompt-card .timeout,
.prompt-card .retry {
    margin-top: 12px;
    padding: 12px;
    background: var(--gray-100);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    border: 1px solid var(--gray-200);
}

.prompt-card strong {
    color: var(--black);
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.prompt-card ul {
    margin: 8px 0;
    padding-left: 20px;
    list-style: none;
}

.prompt-card li {
    color: var(--gray-700);
    margin: 4px 0;
    position: relative;
    padding-left: 16px;
}

.prompt-card li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--gray-500);
}

.next-actions li {
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 0.8rem;
}

.transcript-container {
    background: var(--white);
    padding: 24px;
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    max-height: 600px;
    overflow-y: auto;
}

.transcript-container::-webkit-scrollbar {
    width: 4px;
}

.transcript-container::-webkit-scrollbar-track {
    background: var(--gray-100);
}

.transcript-container::-webkit-scrollbar-thumb {
    background: var(--gray-400);
}

.transcript-container h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--gray-200);
}

.utterance {
    margin-bottom: 16px;
    padding: 16px;
    background: var(--gray-100);
    border-radius: var(--border-radius);
    border-left: 3px solid var(--gray-400);
    transition: var(--transition);
}

.utterance:hover {
    border-left-color: var(--black);
    background: var(--gray-200);
}

.speaker-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-600);
    margin-bottom: 8px;
}

.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--black);
    border-radius: 50%;
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading p {
    color: var(--gray-700);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.875rem;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 40px 16px;
    }

    header h1 {
        font-size: 2rem;
    }

    .upload-section {
        padding: 24px;
    }

    .upload-area {
        padding: 40px 16px;
    }

    .tabs {
        flex-wrap: wrap;
    }

    .tab-btn {
        flex: 1;
        min-width: 120px;
    }
}

/* Print styles */
@media print {
    body {
        background: white;
    }

    .btn-export,
    .remove-file,
    .tabs {
        display: none !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --gray-100: #f0f0f0;
        --gray-200: #e0e0e0;
        --gray-300: #c0c0c0;
        --gray-400: #a0a0a0;
        --gray-500: #808080;
        --gray-600: #606060;
        --gray-700: #404040;
        --gray-800: #202020;
    }

    button {
        border: 2px solid currentColor;
    }
}

/* Dark mode support disabled for better diagram visibility */
/* To enable dark mode, uncomment the section below */
/*
@media (prefers-color-scheme: dark) {
    :root {
        --white: #0a0a0a;
        --black: #ffffff;
        --gray-100: #1a1a1a;
        --gray-200: #2a2a2a;
        --gray-300: #3a3a3a;
        --gray-400: #4a4a4a;
        --gray-500: #6a6a6a;
        --gray-600: #8a8a8a;
        --gray-700: #aaaaaa;
        --gray-800: #cacaca;
        --gray-900: #eaeaea;
    }

    .loading {
        background: rgba(0, 0, 0, 0.95);
    }

    .upload-area {
        background: var(--gray-100);
    }

    .upload-area:hover {
        background: var(--gray-200);
    }
}
*/

/* Saved Flows Section */
.saved-flows-section {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.saved-flows-section > div {
    background: var(--white);
    width: 100%;
    max-width: 900px;
    max-height: 80vh;
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--black);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.saved-flows-header {
    padding: 20px;
    border-bottom: 2px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.saved-flows-header h2 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn-close {
    background: none;
    border: none;
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.btn-close:hover {
    background: var(--gray-100);
}

.saved-flows-list {
    padding: 20px;
    overflow-y: auto;
    flex: 1;
}

.flow-item {
    padding: 20px;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    margin-bottom: 15px;
    cursor: pointer;
    transition: var(--transition);
}

.flow-item:hover {
    border-color: var(--black);
    background: var(--gray-100);
}

.flow-item h3 {
    margin: 0 0 8px 0;
    font-size: 1.125rem;
    font-weight: 700;
}

.flow-item p {
    margin: 0 0 12px 0;
    color: var(--gray-600);
    font-size: 0.875rem;
}

.flow-meta {
    display: flex;
    gap: 20px;
    font-size: 0.75rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.flow-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.loading-saved {
    text-align: center;
    padding: 40px;
}

.loading-saved .spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-300);
    border-top-color: var(--black);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}
/* Enhanced Loading Experience */
.loading-content {
    max-width: 600px;
    width: 90%;
    text-align: center;
    padding: 40px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--gray-200);
}

.loading-animation {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto 40px;
}

.pulse-ring {
    position: absolute;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 2px solid var(--black);
    opacity: 0;
    animation: pulse 3s ease-out infinite;
}

.pulse-ring:nth-child(1) { animation-delay: 0s; }
.pulse-ring:nth-child(2) { animation-delay: 1s; }
.pulse-ring:nth-child(3) { animation-delay: 2s; }

@keyframes pulse {
    0% { transform: scale(0.5); opacity: 1; }
    100% { transform: scale(1.5); opacity: 0; }
}

.loading-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: var(--black);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: float 3s ease-in-out infinite;
}

.loading-icon svg {
    width: 30px;
    height: 30px;
    stroke: white;
    stroke-width: 2;
}

@keyframes float {
    0%, 100% { transform: translate(-50%, -50%) translateY(0); }
    50% { transform: translate(-50%, -50%) translateY(-10px); }
}

.loading-stages {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 30px;
    text-align: left;
}

.stage {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--gray-100);
    border-radius: 8px;
    transition: all 0.3s ease;
    opacity: 0.5;
}

.stage.active {
    background: var(--black);
    color: white;
    opacity: 1;
    transform: translateX(10px);
}

.stage.completed { opacity: 1; }
.stage.completed .stage-status { color: #10b981; }

.stage-icon { font-size: 20px; }
.stage-text { flex: 1; font-size: 14px; font-weight: 500; }
.stage-status { font-size: 20px; }

.progress-container { margin-bottom: 30px; }

.progress-bar {
    height: 8px;
    background: var(--gray-200);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--black) 0%, var(--gray-700) 100%);
    width: 0%;
    transition: width 0.5s ease;
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-600);
}

.quote-container {
    margin-bottom: 30px;
    padding: 20px;
    background: var(--gray-100);
    border-radius: 8px;
    border-left: 4px solid var(--black);
}

.quote {
    font-size: 16px;
    font-style: italic;
    color: var(--gray-700);
    margin-bottom: 8px;
    line-height: 1.5;
    animation: fadeIn 0.5s ease;
}

.quote-author {
    font-size: 14px;
    color: var(--gray-500);
    font-weight: 600;
}

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

.loading-note {
    font-size: 13px;
    color: var(--gray-600);
    line-height: 1.5;
}

.loading-note strong {
    color: var(--black);
    font-weight: 600;
}