:root[data-theme="dark"] {
    --bg-color: #0d1117;
    --text-color: #c9d1d9;
    --card-bg: rgba(22, 27, 34, 0.7);
    --border-color: rgba(48, 54, 61, 0.8);
    --primary-color: #f78166; /* DevOps Amber */
    --primary-hover: #e06c53;
    --secondary-color: rgba(139, 148, 158, 0.2);
    --secondary-hover: rgba(139, 148, 158, 0.3);
    --input-bg: rgba(1, 4, 9, 0.8);
    --input-border: #30363d;
    --radius: 12px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --glass-border: 1px solid rgba(255, 255, 255, 0.05);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
}

:root[data-theme="light"] {
    --bg-color: #f6f8fa;
    --text-color: #24292f;
    --card-bg: rgba(255, 255, 255, 0.8);
    --border-color: rgba(208, 215, 222, 0.8);
    --primary-color: #e06c53; /* DevOps Amber */
    --primary-hover: #cf5e46;
    --secondary-color: rgba(175, 184, 193, 0.2);
    --secondary-hover: rgba(175, 184, 193, 0.3);
    --input-bg: #ffffff;
    --input-border: #d0d7de;
    --radius: 12px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
    --glass-border: 1px solid rgba(0, 0, 0, 0.05);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-sans);
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    min-height: 100vh;
}

header {
    margin-bottom: 1rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    letter-spacing: -0.02em;
}

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

main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    flex: 1;
}

@media (max-width: 900px) {
    main {
        grid-template-columns: 1fr;
    }
}

.config-panel, .preview-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Glassmorphism Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.glass {
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: var(--glass-border);
}

h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.section-header h2 {
    margin-bottom: 0;
    border-bottom: none;
    padding-bottom: 0;
}

/* Form Styles */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group.row {
    flex-direction: row;
    gap: 1rem;
}

.input-field {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-color);
    opacity: 0.9;
}

input, select {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-color);
    padding: 0.625rem 0.75rem;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    transition: all 0.2s ease;
    width: 100%;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(247, 129, 102, 0.15);
}

/* Stage List */
.stages-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stage-item {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr auto;
    gap: 0.75rem;
    align-items: center;
    background: var(--input-bg);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--input-border);
    position: relative;
    animation: slideIn 0.3s ease;
}

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

.stage-item .input-field {
    margin-bottom: 0;
}

.stage-item .input-field label {
    font-size: 0.75rem;
    opacity: 0.7;
    margin-bottom: 0.25rem;
}

.remove-stage-btn {
    color: var(--text-color);
    opacity: 0.5;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 1.25rem; /* Align with inputs skipping label */
}

.remove-stage-btn:hover {
    color: #f85149;
    opacity: 1;
    background: rgba(248, 81, 73, 0.1);
}

/* Explanation Box */
.explanation-box {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    padding: 1rem;
    background: var(--secondary-color);
    border-radius: 8px;
    border-left: 3px solid var(--primary-color);
    font-size: 0.875rem;
    opacity: 0.9;
}

.explanation-box svg {
    color: var(--primary-color);
    flex-shrink: 0;
    margin-top: 0.125rem;
}

/* Chart */
.chart-container {
    position: relative;
    height: 300px;
    width: 100%;
}

/* Code Preview Section */
.export-section {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1rem;
}

.tab-btn {
    background: none;
    border: none;
    color: var(--text-color);
    opacity: 0.7;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border-bottom: 2px solid transparent;
}

.tab-btn:hover {
    opacity: 1;
}

.tab-btn.active {
    opacity: 1;
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    flex: 1;
    display: flex;
    min-height: 250px;
}

.code-preview {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    padding: 1rem;
    overflow-x: auto;
    width: 100%;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    white-space: pre;
    color: var(--text-color);
}

.code-preview.hidden {
    display: none;
}

/* Buttons */
button {
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 6px;
}

.primary-button {
    background-color: var(--primary-color);
    color: white;
    border: 1px solid rgba(0,0,0,0.1);
    padding: 0.5rem 1rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.primary-button:hover {
    background-color: var(--primary-hover);
}

.secondary-button {
    background-color: var(--secondary-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
}

.secondary-button:hover {
    background-color: var(--secondary-hover);
}

.icon-button {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-color);
    padding: 0.5rem;
    opacity: 0.8;
}

.icon-button:hover {
    opacity: 1;
    background-color: var(--secondary-color);
    border-radius: 6px;
}

.icon-button.outline {
    border: 1px solid var(--border-color);
}

.overlay-action {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(4px);
}

.relative {
    position: relative;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.4);
    transform: translateY(0);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal.hidden .modal-content {
    transform: translateY(20px);
}

.modal-header {
    padding: 1.25rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    margin-bottom: 0;
    border-bottom: none;
    padding-bottom: 0;
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
}

#saved-scenarios-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.scenario-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--secondary-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.scenario-item:hover {
    background: var(--secondary-hover);
    border-color: var(--primary-color);
}

.scenario-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.scenario-name {
    font-weight: 600;
}

.scenario-meta {
    font-size: 0.75rem;
    opacity: 0.7;
}

.scenario-actions {
    display: flex;
    gap: 0.5rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(0);
    background: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 2rem;
    font-weight: 500;
    font-size: 0.875rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1000;
}

.toast.hidden {
    transform: translateX(-50%) translateY(3rem);
    opacity: 0;
    pointer-events: none;
}

/* Theme Toggle Icons */
[data-theme="dark"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: none; }