:root {
    --gradient-start: #f4f7ff;
    --gradient-mid: #e3e9ff;
    --gradient-end: #d2dcff;
    --panel-bg: rgba(255, 255, 255, 0.92);
    --card-bg: rgba(255, 255, 255, 0.88);
    --surface-bg: rgba(246, 249, 255, 0.72);
    --border-soft: rgba(148, 163, 184, 0.22);
    --border-strong: rgba(148, 163, 184, 0.42);
    --border-highlight: rgba(58, 128, 255, 0.38);
    --text-primary: #0f172a;
    --text-secondary: rgba(15, 23, 42, 0.64);
    --text-faint: rgba(15, 23, 42, 0.45);
    --accent: #2563eb;
    --accent-strong: #1d4ed8;
    --accent-soft: rgba(37, 99, 235, 0.16);
    --accent-ultra-soft: rgba(191, 219, 254, 0.55);
    --success-soft: rgba(187, 247, 208, 0.85);
    --danger-soft: rgba(254, 226, 226, 0.9);
    --warning-soft: rgba(254, 249, 195, 0.9);
    --shadow-main: 0 34px 80px rgba(79, 114, 205, 0.28);
    --shadow-card: 0 18px 40px rgba(100, 116, 205, 0.22);
    --shadow-soft: 0 12px 28px rgba(99, 102, 241, 0.16);
    --radius-xl: 32px;
    --radius-lg: 26px;
    --radius-md: 18px;
    --radius-sm: 14px;
    --font-stack: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: "Fira Code", "Cascadia Code", "Consolas", monospace;
    --transition: 200ms ease;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font-stack);
    background: radial-gradient(circle at top left, rgba(255, 255, 255, 0.65), transparent 55%),
        radial-gradient(circle at 80% -10%, rgba(167, 199, 255, 0.65), transparent 55%),
        linear-gradient(140deg, var(--gradient-start), var(--gradient-mid) 45%, var(--gradient-end));
    color: var(--text-primary);
    display: flex;
    align-items: stretch;
    justify-content: center;
    padding: 48px 28px 64px;
}

@media (max-width: 1024px) {
    body {
        padding: 36px 20px 48px;
    }
}

@media (max-width: 720px) {
    body {
        padding: 28px 16px 40px;
    }
}

.app-shell {
    width: 100%;
    max-width: 1320px;
    backdrop-filter: blur(24px) saturate(180%);
    background: rgba(255, 255, 255, 0.94);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(148, 163, 184, 0.26);
    box-shadow: var(--shadow-main);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

header.app-header {
    padding: 32px 46px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(148, 163, 184, 0.18);
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(18px);
}

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

.brand-mark {
    width: 54px;
    height: 54px;
    border-radius: 20px;
    background:
        linear-gradient(145deg, rgba(59, 130, 246, 0.75), rgba(129, 140, 248, 0.92));
    color: #fff;
    font-weight: 700;
    letter-spacing: 0.05em;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35), 0 12px 25px rgba(100, 116, 205, 0.35);
}

.brand-title {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.brand-title span:first-child {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-faint);
}

.brand-title span:last-child {
    font-size: 1.32rem;
    font-weight: 700;
}

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

.header-meta span {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    border-radius: 999px;
    background: rgba(241, 245, 255, 0.8);
    border: 1px solid rgba(148, 163, 184, 0.32);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.header-meta span svg {
    width: 18px;
    height: 18px;
}

.layout {
    display: grid;
    grid-template-columns: minmax(0, 430px) minmax(0, 1fr);
    gap: 32px;
    padding: 38px 46px 44px;
}

@media (max-width: 1120px) {
    .layout {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--panel-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-soft);
    box-shadow: var(--shadow-card);
    padding: 32px 34px;
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.panel-head h1,
.panel-head h2 {
    margin: 0;
    font-size: 1.9rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.panel-head p {
    margin: 10px 0 0;
    color: var(--text-secondary);
    font-size: 0.98rem;
    line-height: 1.6;
}

.builder-guidance,
.workflow-tips {
    background: var(--surface-bg);
    border-radius: var(--radius-md);
    border: 1px solid rgba(148, 163, 184, 0.24);
    padding: 20px 22px 18px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45);
}

.builder-guidance__title,
.workflow-tips h3 {
    margin: 0;
    font-size: 1.02rem;
    font-weight: 600;
    color: var(--accent-strong);
}

.builder-guidance ul,
.workflow-tips ul {
    margin: 0;
    padding-left: 22px;
    color: var(--text-secondary);
    line-height: 1.55;
    font-size: 0.95rem;
}

.builder-guidance li + li,
.workflow-tips li + li {
    margin-top: 6px;
}

.quick-actions {
    display: flex;
    align-items: center;
    gap: 18px;
    background: linear-gradient(145deg, rgba(191, 219, 254, 0.85), rgba(219, 234, 254, 0.92));
    border-radius: 999px;
    border: 1px solid rgba(147, 197, 253, 0.55);
    padding: 12px 20px;
    flex-wrap: wrap;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.quick-actions__label {
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-strong);
}

.quick-actions__group {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.quick-actions__button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    border: none;
    border-radius: 999px;
    padding: 10px 18px;
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--accent-strong);
    background: rgba(255, 255, 255, 0.94);
    box-shadow: 0 12px 24px rgba(99, 102, 241, 0.18);
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.quick-actions__button:hover {
    transform: translateY(-1px);
    box-shadow: 0 14px 30px rgba(99, 102, 241, 0.22);
    background: rgba(249, 250, 255, 0.98);
}

.quick-actions__button:active {
    transform: translateY(0);
}

.quick-actions__icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(191, 219, 254, 0.75);
    color: var(--accent-strong);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.quick-actions__icon svg {
    width: 15px;
    height: 15px;
}

.quick-actions__text {
    white-space: nowrap;
}

.steps-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.step-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    border: 1px solid rgba(148, 163, 184, 0.24);
    padding: 22px 24px;
    display: flex;
    flex-direction: column;
    gap: 18px;
    box-shadow: var(--shadow-soft);
    transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.step-card:hover {
    border-color: var(--border-highlight);
    box-shadow: 0 18px 44px rgba(99, 102, 241, 0.25);
    transform: translateY(-2px);
}

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

.step-card__meta {
    display: flex;
    align-items: center;
    gap: 12px;
}

.step-index {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-faint);
}

.drag-handle {
    border: none;
    background: rgba(191, 219, 254, 0.8);
    color: var(--accent-strong);
    width: 38px;
    height: 38px;
    border-radius: 12px;
    cursor: grab;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition), box-shadow var(--transition);
}

.drag-handle:hover {
    background: rgba(191, 219, 254, 0.95);
    box-shadow: 0 10px 24px rgba(99, 102, 241, 0.2);
}

.drag-handle:active {
    cursor: grabbing;
}

.drag-handle svg {
    width: 16px;
    height: 16px;
}

.icon-btn {
    background: rgba(241, 245, 255, 0.92);
    border: 1px solid rgba(59, 130, 246, 0.25);
    color: var(--accent-strong);
    padding: 7px 14px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.icon-btn .icon-inline svg {
    width: 16px;
    height: 16px;
}

.icon-btn:hover {
    background: rgba(219, 234, 254, 0.95);
}

.icon-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.icon-btn.danger {
    background: rgba(254, 226, 226, 0.65);
    border: 1px solid rgba(248, 113, 113, 0.42);
    color: #b91c1c;
}

.icon-btn.danger:hover {
    background: rgba(254, 226, 226, 0.85);
}

.field-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.field-group label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.field-group input,
.field-group select,
textarea.readonly-area {
    border-radius: 14px;
    border: 1px solid rgba(148, 163, 184, 0.38);
    padding: 12px 14px;
    font-size: 1rem;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.96);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.field-group input:focus,
.field-group select:focus,
textarea.readonly-area:focus {
    outline: none;
    border-color: rgba(59, 130, 246, 0.6);
    box-shadow: 0 0 0 3px rgba(191, 219, 254, 0.6);
}

.field-inline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 16px;
}

.decision-fields {
    display: none;
    flex-direction: column;
    gap: 14px;
    padding: 16px;
    border-radius: var(--radius-sm);
    background: rgba(219, 234, 254, 0.6);
    border: 1px dashed rgba(59, 130, 246, 0.45);
}

.decision-fields.active {
    display: flex;
}

.decision-fields .hint {
    margin: 0;
    font-size: 0.82rem;
    color: var(--text-faint);
}

.panel-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    justify-content: flex-end;
    flex-wrap: wrap;
}

.panel-actions .spacer {
    flex: 1 0 12px;
}

.btn {
    border: none;
    border-radius: 999px;
    padding: 12px 26px;
    font-size: 0.96rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: transform var(--transition), box-shadow var(--transition);
}

.btn.primary {
    background: linear-gradient(135deg, #93c5fd, #60a5fa 45%, #2563eb 100%);
    color: #fff;
    box-shadow: 0 18px 34px rgba(59, 130, 246, 0.35);
}

.btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 22px 40px rgba(37, 99, 235, 0.38);
}

.btn.ghost {
    background: rgba(241, 245, 255, 0.85);
    color: var(--accent-strong);
    border: 1px solid rgba(147, 197, 253, 0.55);
}

.btn.ghost:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 26px rgba(99, 102, 241, 0.22);
}

.btn.text {
    background: transparent;
    color: var(--accent-strong);
    padding: 8px 14px;
}

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

.insights-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    background: rgba(246, 249, 255, 0.85);
    border-radius: var(--radius-md);
    border: 1px solid rgba(148, 163, 184, 0.24);
    padding: 18px 20px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.insight {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.96);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(148, 163, 184, 0.28);
    padding: 12px 16px;
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.insight__icon {
    width: 38px;
    height: 38px;
    border-radius: 14px;
    background: rgba(191, 219, 254, 0.75);
    color: var(--accent-strong);
    display: flex;
    align-items: center;
    justify-content: center;
}

.insight__icon svg {
    width: 18px;
    height: 18px;
}

.insight__content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.insight__label {
    font-size: 0.78rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-faint);
}

.insight__value {
    font-size: 1.4rem;
    font-weight: 700;
}

.insight--positive {
    border-color: rgba(74, 222, 128, 0.42);
    box-shadow: 0 16px 32px rgba(74, 222, 128, 0.18);
}

.insight--positive .insight__icon {
    background: var(--success-soft);
    color: #047857;
}

.insight--alert {
    border-color: rgba(248, 113, 113, 0.46);
    box-shadow: 0 16px 32px rgba(248, 113, 113, 0.18);
}

.insight--alert .insight__icon {
    background: var(--danger-soft);
    color: #b91c1c;
}

.insight--neutral {
    border-style: dashed;
}

.preview-surface {
    position: relative;
    min-height: 360px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(148, 163, 184, 0.22);
    background: rgba(255, 255, 255, 0.96);
    padding: 24px;
    box-shadow: inset 0 2px 18px rgba(148, 163, 184, 0.12);
    overflow: hidden;
}

.mermaid-preview svg {
    width: 100%;
    height: auto;
}

.mermaid-preview {
    display: none;
}

.mermaid-preview.active {
    display: block;
}

.empty-state {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    text-align: center;
    color: var(--text-secondary);
}

.empty-state h3 {
    margin: 0;
    font-size: 1.12rem;
    font-weight: 600;
}

.preview-error {
    color: #b91c1c;
    font-weight: 600;
}

.code-block {
    display: flex;
    flex-direction: column;
    gap: 14px;
    background: rgba(248, 250, 255, 0.9);
    border-radius: var(--radius-md);
    border: 1px solid rgba(148, 163, 184, 0.28);
    padding: 22px;
}

.code-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--text-secondary);
    font-size: 0.92rem;
}

textarea.readonly-area {
    width: 100%;
    min-height: 140px;
    resize: vertical;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(148, 163, 184, 0.36);
    background: rgba(255, 255, 255, 0.96);
    color: var(--text-primary);
    padding: 14px 16px;
    font-family: var(--font-mono);
    line-height: 1.5;
}

.step-card--warning {
    border-color: rgba(248, 113, 113, 0.6);
    box-shadow: 0 20px 48px rgba(248, 113, 113, 0.22);
}

.step-feedback {
    margin: -4px 0 0;
    font-size: 0.84rem;
    color: #b91c1c;
    font-weight: 500;
}

.step-feedback:empty {
    display: none;
}

footer.app-footer {
    padding: 18px 46px 28px;
    border-top: 1px solid rgba(148, 163, 184, 0.2);
    background: rgba(248, 250, 255, 0.9);
    color: var(--text-secondary);
    font-size: 0.92rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

footer.app-footer a {
    color: var(--accent-strong);
    text-decoration: none;
}

footer.app-footer a:hover {
    color: var(--accent);
}

/* Drag states */

.step-card.is-dragging {
    opacity: 0.6;
    border-style: dashed;
    transform: scale(0.98);
}

.steps-list.is-sorting .step-card:not(.is-dragging) {
    transition: transform var(--transition), border-color var(--transition);
}

.icon-inline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.icon-inline svg {
    width: 16px;
    height: 16px;
}

@media (max-width: 640px) {
    .quick-actions__icon {
        width: 26px;
        height: 26px;
    }
}

/* Generated flowchart view */

.generate-shell {
    width: min(1140px, 98vw);
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(148, 163, 184, 0.26);
    box-shadow: var(--shadow-main);
    backdrop-filter: blur(18px);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.generate-shell > header {
    padding: 34px 44px 20px;
    border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.generate-shell > header h1 {
    margin: 0;
    font-size: 1.82rem;
    font-weight: 700;
}

.generate-shell > header p {
    margin: 10px 0 0;
    color: var(--text-secondary);
}

.generate-main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 34px 44px 40px;
}

.diagram-stage {
    background: rgba(255, 255, 255, 0.96);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(148, 163, 184, 0.22);
    padding: 32px;
    min-height: 420px;
    position: relative;
    box-shadow: inset 0 1px 18px rgba(148, 163, 184, 0.12);
}

.diagram-stage.empty::before {
    content: 'Add steps to preview your flowchart.';
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-weight: 600;
}

.diagram-stage svg {
    width: 100%;
    height: auto;
}

.code-panel {
    background: rgba(248, 250, 255, 0.92);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(148, 163, 184, 0.26);
    padding: 24px 26px 28px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.code-panel header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--text-secondary);
    font-size: 0.96rem;
}

.code-panel header button,
.footer-actions button,
.footer-actions a {
    background: rgba(241, 245, 255, 0.92);
    border: 1px solid rgba(147, 197, 253, 0.55);
    color: var(--accent-strong);
    border-radius: 999px;
    padding: 10px 18px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: transform var(--transition), box-shadow var(--transition);
}

.code-panel header button:hover,
.footer-actions button:hover,
.footer-actions a:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 24px rgba(99, 102, 241, 0.18);
}

textarea#definitionArea {
    width: 100%;
    min-height: 150px;
    resize: vertical;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(148, 163, 184, 0.32);
    background: rgba(255, 255, 255, 0.96);
    color: var(--text-primary);
    padding: 14px 16px;
    font-family: var(--font-mono);
}

.generate-shell > footer {
    padding: 20px 44px 32px;
    border-top: 1px solid rgba(148, 163, 184, 0.2);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    color: var(--text-secondary);
}

.footer-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

@media (max-width: 720px) {
    .layout,
    .generate-main {
        padding: 30px 26px 34px;
    }

    header.app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 18px;
    }

    .panel {
        padding: 28px;
    }
}
.app-footer__meta,
.footer-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.footer-copy {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-copy a {
    color: var(--accent-strong);
    text-decoration: none;
    font-weight: 600;
}

.footer-copy a:hover {
    color: var(--accent);
}