/*
see https://www.joshwcomeau.com/css/custom-css-reset/
*/

/* 1. Box-sizing model */

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    /* 3. Enable keyword animations */
    interpolate-size: allow-keywords;
}

* {
    /* 2. Remove default margin */
    margin: 0;

    /*
        3. Add accessible line-height 
        see https://kittygiraudel.com/2020/05/18/using-calc-to-figure-out-optimal-line-height/
    */
    line-height: calc(2px + 2ex + 2px);
}

body {
    /* 4. Improve text rendering */
    -webkit-font-smoothing: antialiased;
}

/* 5. Improve media defaults */

img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
}

/* 6. Inherit fonts for form controls */

input, button, textarea, select {
    font: inherit;
}

/* 7. Avoid text overflows */

p {
    text-wrap: pretty;
    overflow-wrap: break-word;
    hyphens: auto;
}

/* 8. Improve line wrapping */

h1, h2, h3, h4, h5, h6 {
    text-wrap: balance;
    overflow-wrap: break-word;
}

/*
  9. Create a root stacking context

  __OPTIONAL__

  see https://www.joshwcomeau.com/css/custom-css-reset/#nine-root-stacking-context-10
  see https://www.joshwcomeau.com/css/stacking-contexts/
*/

#root {
    isolation: isolate;
}

/* see https://gomakethings.com/how-to-animate-scrolling-to-anchor-links-with-one-line-of-css/#accessibility-concerns */

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

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

substrate-button button, substrate-button a.btn {
  color: #000;
  cursor: pointer;
  background: none;
  border: 1px solid;
  outline: 1px solid rgba(0, 0, 0, 0);
  padding: .5rem 2rem;
  font-size: 1rem;
  text-decoration: none;
  transition: all .2s;
  transform: translateY(1px);
}

:is(substrate-button button, substrate-button a.btn):focus {
  outline: 1px solid;
}

:is(substrate-button button, substrate-button a.btn):hover {
  outline: 1px solid;
  transform: translateY(0);
}

:is(substrate-button button, substrate-button a.btn):active {
  transform: translateY(2px);
}

:is(substrate-button button, substrate-button a.btn):disabled {
  cursor: not-allowed;
  opacity: .4;
}

:is(substrate-button button, substrate-button a.btn):disabled:hover {
  outline-color: rgba(0, 0, 0, 0);
  transform: translateY(1px);
}

:is(substrate-button button, substrate-button a.btn).spinning {
  opacity: .4;
}

:is(substrate-button button, substrate-button a.btn).spinning .btn-content {
  visibility: hidden;
}

:is(substrate-button button, substrate-button a.btn).spinning:hover {
  cursor: initial;
}

:is(substrate-button button, substrate-button a.btn).spinning:after {
  content: "";
  box-sizing: border-box;
  background: none;
  border-top: 2px solid #000;
  border-right: 2px solid rgba(0, 0, 0, 0);
  border-radius: 50%;
  width: 16px;
  height: 16px;
  margin: auto;
  animation: .6s linear infinite spinner;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}

:root {
    --bg: #fff;
    --surface: #fff;
    --gray: #666;
    --border: var(--gray);
    --text: black;
    --text-secondary: var(--gray);
    --accent: #3b5998;
    --accent-light: #eef1f8;
    --danger: #c00;
    --hash-bg: var(--accent-light);
    --mono: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Consolas,
        'DejaVu Sans Mono', monospace;
}

body {
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    max-width: 70rem;
    margin: 0 auto;
    margin-bottom: 8rem;
}

#root {
    margin: 0 1rem;
}

.app {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.app-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-auto-rows: 32rem;
    gap: 2rem;
    align-items: stretch;
}

.app-grid > * {
    min-height: 0;
}

header.app-header {
    margin-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.subtitle {
    margin-top: 1rem;
}

.hash-explainer {
    max-width: 40rem;
    & p {
        line-height: 1.4;
    }
    & p:last-child {
        margin-bottom: 0;
    }
}

button {
    cursor: pointer;
    min-width: 8rem;
}

substrate-button button.reset-btn {
    padding: 1rem;
    border: 1px solid var(--border);
    background: var(--surface);
    cursor: pointer;
    border-color: var(--danger);

    &:hover {
        border-color: var(--danger);
        outline-color: var(--danger);
    }
}

/* ---- create form ---- */

.create-form {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 1rem;
    margin-bottom: 0;
    height: 100%;
    overflow-y: auto;
}

.create-form h2 {
    margin-bottom: 1rem;
}

.create-form label {
    display: block;
    margin-bottom: 1rem;
}

.create-form label span {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.create-form input,
.create-form textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border);
    font-family: inherit;
}

.create-form textarea {
    resize: vertical;
}

substrate-button button.create-submit {
    margin-top: 1rem;
    padding: 1rem;
}

/* ---- heads section ---- */

.heads-panel,
.nodes-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 1rem;
    height: 100%;
    overflow-y: auto;
}

.heads-section {
    margin-bottom: 0;
}

.heads-section h2 {
    margin-bottom: 1rem;
}

.heads-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 0 0 1rem;

    & dt {
        margin: 0;
        width: 2rem;
    }

    & dd {
        margin: 0;
        display: flex;
        align-items: center;
        gap: 1rem;
        flex-wrap: wrap;
    }
}

.head-hash {
    font-weight: 600;
}

/* ---- nodes section ---- */

.nodes-section h2 {
    margin-bottom: 1rem;
}

.node-json {
    margin: 0 0 1rem;
    white-space: pre;
    overflow: auto;
    border: 1px solid var(--border);
    padding: 1rem;
}

.selected-node-json {
    margin: 0;
    white-space: pre;
    overflow: auto;
}

.empty-state {
    color: var(--text-secondary);
}

/* ---- node card ---- */

.node-card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 1rem;
    margin-bottom: 1rem;
}

.node-card header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.node-key {
    font-weight: 600;
}

.node-hash {
    font-family: var(--mono);
    background: var(--hash-bg);
    padding: 1rem;
    color: var(--text-secondary);
}

.node-body {
    margin-bottom: 1rem;
    white-space: pre-wrap;
}

.node-links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
}

.link-label {
    text-transform: uppercase;
    color: var(--text-secondary);
    min-width: 2rem;
}

/* ---- hash link button ---- */

substrate-button button.hash-link {
    font-family: var(--mono);
    background: var(--accent-light);
    color: var(--accent);
    border: none;
    padding: 1rem;
    cursor: pointer;
    text-decoration: none;
}

substrate-button button.hash-link:hover {
    background: var(--accent);
    color: #fff;
}

/* ---- history panel ---- */

.history-panel {
    margin-top: 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 1rem;
}

.history-panel h3 {
    margin-bottom: 1rem;
    word-break: break-all;
}

.history-panel ol {
    list-style: decimal inside;
    padding: 0;
}

.history-panel li {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.history-key {
    color: var(--text-secondary);
}

/* ---- DAG panel ---- */

.dag-section {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 1rem;
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.dag-section h2 {
    margin-bottom: 1rem;
}

.dag-scroll {
    padding: 1rem;
    flex: 1;
    min-height: 0;
    overflow-x: auto;
    overflow-y: auto;
}

.dag-canvas {
    display: block;
}

.dag-edge {
    stroke: var(--gray);
    stroke-width: 2;
}

.dag-node-group {
    cursor: pointer;
}

.dag-node {
    fill: var(--accent-light);
    stroke: var(--accent);
    stroke-width: 2;
}

.dag-node-selected {
    stroke-width: 4px;
}

.dag-node-label {
    font-family: var(--mono);
}

.dag-node-key-bg {
    fill: #fff;
}

.dag-node-key {
    fill: var(--text);
}

.dag-selected {
    margin-top: 1rem;
    font-size: 1rem;
}

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