/* ── Design tokens ── */
:root {
    --font:            "neue-haas-grotesk-text", sans-serif;
    --ease:            0.15s ease;
    --ease-spring:     0.3s cubic-bezier(0.22, 1, 0.36, 1);

    --black:           #000000;
    --white:           #ffffff;
    --canvas-bg:       #eeeeee;
    --surface:         #E8E8E8;
    --surface-hover:   #cccccc;
    --surface-dark:    #1a1a1a;
    --text-muted:      #9F9F9F;
    --text-faint:      #bfbfbf;
    --icon:            #8B8B8B;
    --border-muted:    #C1C1C1;
    --danger:          #FF1D33;
}

/* ── Media width ── */
#mobile-block {
    display: none;
    position: fixed;
    inset: 0;
    background-color: #eeeeee;
    z-index: 9999;
    align-items: center;
    justify-content: center;
}
#mobile-block-card {
    background-color: #ffffff;
    border-radius: 6px;
    padding: 24px;
    max-width: 280px;
    width: calc(100% - 48px);
    display: flex;
    flex-direction: column;
    gap: 8px;
}
@media (max-width: 1099px) {
    #mobile-block { display: flex; }
}

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

a {
    color: inherit;
    text-decoration: underline;
}

h3 {
    font-family: var(--font);
    font-weight: 500;
    font-size: 16px;
    color: var(--black);
}

h6 {
    font-family: var(--font);
    font-weight: 400;
    font-size: 12px;
    color: var(--text-muted);
    letter-spacing: .5px;
}

h6.white-background {
    color: var(--text-faint);
}

#intro{
    background-color: var(--surface);
    border-radius: 6px;
    width: 100%;
    aspect-ratio: 3/2;
}

/* ── Layout ── */
#container {
    display: grid;
    grid-template-rows: 48px 1fr 24px;
    height: 100vh;
    overflow: hidden;
    position: relative;
}

#header {
    height: 48px;
    padding: 0 24px;
    background-color: var(--white);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#logo-square {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    animation: logoColorCycle 14s steps(1, end) infinite;
}

@keyframes logoColorCycle {
    0%    { background-color: #FF5096; }
    7.14% { background-color: #7758FF; }
    14.3% { background-color: #FFB300; }
    21.4% { background-color: #00A6FF; }
    28.6% { background-color: #C552FF; }
    35.7% { background-color: #FF7A27; }
    42.9% { background-color: #FF1D33; }
    50.0% { background-color: #FFEE00; }
    57.1% { background-color: #FF5922; }
    64.3% { background-color: #81EEFF; }
    71.4% { background-color: #00E4D9; }
    78.6% { background-color: #C1F62E; }
    85.7% { background-color: #FF76F8; }
    92.9% { background-color: #00DB69; }
}

#main {
    overflow: auto;
    background-color: var(--canvas-bg);
}

#footer {
    height: 24px;
    background-color: var(--white);
    padding: 5px 24px;
}

/* ── Sidebar ── */
#sidebar {
    position: absolute;
    left: 0;
    top: 48px;
    bottom: 24px;
    width: 48px;
    background: var(--surface);
    z-index: 50;
    overflow: hidden;
    display: flex;
    flex-direction: row;
    align-items: stretch;
    transition: width var(--ease-spring);
}

#sidebar.is-open {
    width: 360px;
    flex-direction: row-reverse;
}

#sidebar.is-open #sidebar-toggle {
    position: absolute;
    right: 0;
    top: 0;
}

#sidebar-toggle {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    align-self: flex-start;
    background: none;
    border: none;
    color: var(--icon);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--ease);
    z-index: 2;
}

#sidebar-toggle:hover {
    color: var(--black);
    scale: 1.05;
}

#sidebar-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
}

#sidebar-body {
    flex: 1;
    padding: 24px 12px 0 24px;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--ease) 0s;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

#sidebar.is-open #sidebar-body {
    opacity: 1;
    pointer-events: all;
    transition: opacity 0.2s ease 0.15s;
}

#sidebar.is-closing #sidebar-body {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease 0s;
}

#sidebar.is-closing {
    transition: width var(--ease-spring) 0.15s;
}

#sidebar-header {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 12px;
}

#sidebar-square {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#sidebar-square svg {
    fill: var(--black);
}

#sidebar-description {
    color: var(--icon);
    margin-top: 10px;
    margin-bottom: 14px;
    line-height: 1.3;
    flex-shrink: 0;
}

/* ── Sidebar dropdown ── */
#sidebar-dropdown-wrap {
    position: relative;
    flex: 1;
    min-width: 0;
}

#sidebar-dropdown-btn {
    height: 48px;
    padding: 0 8px 0 0;
    background: none;
    border: none;
    color: var(--black);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    border-radius: 6px;
    white-space: nowrap;
    max-width: 100%;
    transition: background-color var(--ease);
}

#sidebar-dropdown-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

#sidebar-title {
    color: var(--black);
    overflow: hidden;
    text-overflow: ellipsis;
}

#sidebar-dropdown-arrow {
    color: var(--black);
    flex-shrink: 0;
    transition: transform 0.2s ease;
}

#sidebar-dropdown-wrap.is-open #sidebar-dropdown-arrow {
    transform: rotate(180deg);
}

#sidebar-dropdown-list {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    background: var(--surface-dark);
    border-radius: 6px;
    list-style: none;
    padding: 4px;
    min-width: 180px;
    display: none;
    z-index: 200;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

#sidebar-dropdown-list.is-open {
    display: block;
}

#sidebar-dropdown-list li {
    font-family: var(--font);
    font-size: 12px;
    font-weight: 500;
    color: var(--text-muted);
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    letter-spacing: 0.04em;
    transition: background-color 0.1s ease, color 0.1s ease;
}

#sidebar-dropdown-list li:hover,
#sidebar-dropdown-list li[aria-selected="true"] {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

/* ── Phrase chips ── */
#sidebar-phrases {
    display: flex;
    flex-direction: column;
    gap: 12px;
    overflow-y: auto;
    padding-top: 12px;
    padding-bottom: 12px;
    padding-right: 6px;
    flex: 1;
    min-height: 0;
    z-index: 1;
}

.phrase-chip {
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    flex-shrink: 0;
    background-color: var(--chip-color, var(--text-muted));
    transition: filter var(--ease), transform var(--ease);
    user-select: none;
}

.phrase-chip h3 {
    font-size: 14px;
    font-weight: 400;
    line-height: 1.4;
    color: var(--black);
}

.phrase-chip:hover {
    filter: brightness(1.12);
    transform: scale(0.98) rotate(-2.5deg);
}

.phrase-chip.chip-enter {
    animation: chipEnter 0.5s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes chipEnter {
    from { opacity: 0; filter: blur(4px); transform: translateY(8px); }
    to   { opacity: 1; filter: blur(0);   transform: translateY(0); }
}

/* ── Prompt canvas ── */
.prompt-wrapper {
    position: absolute;
}

.prompt {
    width: 100%;
    display: flex;
    flex-direction: column;
}

.prompt-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
    padding: 2px 0;
}

.prompt-header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.prompt-title {
    width: fit-content;
    padding: 2px 4px;
}

.prompt-title.editing {
    background-color: var(--white);
    border: 1px solid var(--text-muted);
    border-radius: 6px;
}

.prompt-title-text[contenteditable="true"],
.prompt-title-text[contenteditable="true"]:focus {
    outline: none;
    border: none;
    box-shadow: none;
}

.prompt-title-text {
    -webkit-tap-highlight-color: transparent;
}

.prompt-block {
    background-color: var(--white);
    padding: 24px;
    position: relative;
    min-height: 360px;
    border-radius: 6px;
}

/* ── Edge dots ── */
.edge-dot {
    position: absolute;
    width: 14px;
    height: 14px;
    background-color: var(--white);
    border: 2px solid var(--surface);
    border-radius: 12px;
    pointer-events: all;
    z-index: 2;
    cursor: crosshair;
    transform: var(--t);
    transition: background-color var(--ease), border-color var(--ease), transform var(--ease);
}

.edge-dot:hover {
    background-color: var(--black);
    border-color: var(--border-muted);
    transform: var(--t) scale(1.2);
}

.edge-dot--top    { top: -7px;    left: 50%;  --t: translateX(-50%); }
.edge-dot--bottom { bottom: -7px; left: 50%;  --t: translateX(-50%); }

.prompt-text {
    font-family: var(--font);
    font-weight: 500;
    line-height: 1.3;
    font-size: 28px;
    color: var(--black);
    outline: none;
    flex: 1;
    min-height: 1em;
}

.prompt-text:empty::before {
    content: attr(data-placeholder);
    color: var(--text-faint);
    pointer-events: none;
    display: block;
}

.character-count {
    padding: 2px 4px;
}

.delete-btn {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    cursor: pointer;
    flex-shrink: 0;
    transition: color var(--ease);
}

.delete-btn:hover {
    color: var(--danger);
}

/* ── Add row button ── */
.add-prompt-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 50%;
    background-color: var(--surface);
    color: var(--icon);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--ease), background-color var(--ease), color var(--ease);
}

.add-right-btn:hover,
.add-bottom-btn:hover {
    transform: translate(-50%, -50%) scale(1.05);
    background-color: var(--black);
    color: var(--white);
}

.add-prompt-btn.is-new {
    animation: btnEnter 1s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes btnEnter {
    from { opacity: 0; filter: blur(4px); transform: translate(-50%, -50%) translateY(12px); }
    to   { opacity: 1; filter: blur(0);   transform: translate(-50%, -50%) translateY(0); }
}

/* ── Entry animation ── */
.prompt-wrapper.is-new {
    animation: promptEnter 1s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes promptEnter {
    from { opacity: 0; filter: blur(4px); transform: translateY(12px); }
    to   { opacity: 1; filter: blur(0);   transform: translateY(0); }
}

/* ── Zoom controls ── */
#zoom-controls {
    position: absolute;
    top: 60px;
    right: 24px;
    z-index: 100;
    background-color: var(--surface);
    display: flex;
    align-items: center;
    border-radius: 4px;
    overflow: hidden;
    user-select: none;
}

#zoom-controls button {
    background: none;
    border: none;
    color: var(--icon);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
    transition: background-color var(--ease);
}

#zoom-controls button:hover {
    background-color: var(--surface-hover);
    color: var(--black);
}

#zoom-label {
    font-family: var(--font);
    font-weight: 500;
    font-size: 11px;
    letter-spacing: 0.05em;
    color: var(--icon);
    min-width: 36px;
    text-align: center;
}

/* ── Export controls ── */
#export-controls {
    position: absolute;
    bottom: 36px;
    right: 24px;
    z-index: 100;
    background-color: var(--surface);
    border-radius: 4px;
    overflow: hidden;
    user-select: none;
    display: flex;
    flex-direction: row;
}

#export-controls button {
    background: none;
    border: none;
    color: var(--icon);
    height: 24px;
    padding: 0 8px 0 6px;
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    transition: background-color var(--ease), color var(--ease);
}

#export-controls button + button {
    border-left: 1px solid var(--surface-hover);
}

#export-controls button:hover {
    background-color: var(--surface-hover);
    color: var(--black);
}

.export-label {
    font-family: var(--font);
    font-weight: 500;
    font-size: 12px;
    letter-spacing: 0.05px;
    color: inherit;
}

#logo {
    display: flex;
    align-items: center;
    gap: 6px;
}

#logo h3 {
    color: var(--black);
}

/* ── Project title ── */
#project-title-wrap {
    padding: 2px 4px;
    border-radius: 6px;
    border: 1px solid transparent;
    transition: border-color var(--ease), background-color var(--ease);
}

#project-title-wrap.editing {
    background-color: var(--white);
    border-color: var(--text-muted);
}

#project-title {
    outline: none;
    white-space: nowrap;
    -webkit-tap-highlight-color: transparent;
    cursor: default;
}

#project-title[contenteditable="true"] {
    cursor: text;
}

/* ── Button success flash ── */
#export-controls button.btn-success {
    background-color: #00DB69;
    color: #000000;
    transition: background-color 0.25s cubic-bezier(0.22, 1, 0.36, 1), color 0.25s ease;
}

#export-controls button.btn-success-exit {
    background-color: var(--surface-hover);
    color: var(--icon);
    transition: background-color 0.4s ease, color 0.4s ease;
}

#export-controls button.btn-success .export-label {
    color: #000000;
}

.btn-check-icon {
    flex-shrink: 0;
}

.check-path {
    stroke-dasharray: 20;
    stroke-dashoffset: 20;
    animation: drawCheck 0.35s cubic-bezier(0.22, 1, 0.36, 1) 0.05s forwards;
}

@keyframes drawCheck {
    to { stroke-dashoffset: 0; }
}


/* ── Welcome modal ── */
#welcome-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background-color: rgba(238, 238, 238, 0.5);
}

#welcome-overlay.is-closing {
    animation: welcomeExit 0.3s ease forwards;
}

@keyframes welcomeExit {
    from { opacity: 1; filter: blur(0); }
    to   { opacity: 0; filter: blur(4px); }
}

#welcome-card {
    background-color: var(--white);
    border-radius: 6px;
    padding: 24px;
    width: 480px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    animation: promptEnter 1s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

#welcome-body {
    color: var(--text-muted);
    line-height: 1.6;
}

#welcome-start {
    align-self: center;
    height: 24px;
    padding: 0 16px;
    background-color: var(--surface);
    color: var(--icon);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    transition: background-color var(--ease);
}

#welcome-start:hover {
    background-color: var(--surface-hover);
    color: var(--black);
}

/* ── Scrollbars ── */
::-webkit-scrollbar         { width: 6px; height: 6px; }
::-webkit-scrollbar-track   { background: transparent; }
::-webkit-scrollbar-thumb   { border-radius: 3px; background: var(--text-muted); }
::-webkit-scrollbar-button  { display: none; width: 0; height: 0; }
::-webkit-scrollbar-corner  { background: transparent; }

/* ── Drop insertion indicator ── */
.drop-indicator {
    position: absolute;
    width: 2px;
    pointer-events: none;
    z-index: 10;
    background-color: var(--ind-color, var(--black));
    border-radius: 1px;
    opacity: 0.85;
}

/* ── Highlighted phrase spans dropped into prompt ── */
.block-phrase {
    display: inline;
    background-color: var(--phrase-color, var(--surface-hover));
    border-radius: 3px;
    padding: 1px 4px;
    color: var(--black);
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
}

/* ── Connection label DOM node ── */
.conn-label-node {
    position: absolute;
    transform: translate(-50%, -50%);
    z-index: 5;
    pointer-events: all;
    white-space: nowrap;
    cursor: default;
    background-color: var(--black);
    border: 1px solid var(--black);
    border-radius: 6px;
    padding: 2px 6px;
    width: fit-content;
}

.conn-label-node.editing {
    background-color: var(--white);
    border-color: var(--text-muted);
    cursor: text;
}

.conn-label-node .conn-label-text {
    color: var(--white);
    white-space: nowrap;
}

.conn-label-node.editing .conn-label-text {
    color: var(--black);
}

.conn-label-node .conn-label-text[contenteditable="true"],
.conn-label-node .conn-label-text[contenteditable="true"]:focus {
    outline: none;
    border: none;
    box-shadow: none;
}

/* ── Dragging chip clone ── */
.chip-drag-clone {
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    transform: rotate(-3deg) scale(1.04);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
    opacity: 0.96;
    transition: none;
}