:root {
  --bg-deep: #0e1512;
  --bg-mid: #15201b;
  --bg-lift: #1c2a24;
  --ink: #e8f0eb;
  --ink-mute: #9bb0a4;
  --ink-faint: #6a8074;
  --accent: #7ec8a3;
  --accent-hot: #c9e87a;
  --accent-soft: rgba(126, 200, 163, 0.16);
  --line: rgba(126, 200, 163, 0.35);
  --danger: #e07a6a;
  --panel: rgba(18, 28, 24, 0.92);
  --node: #24352d;
  --node-border: rgba(126, 200, 163, 0.28);
  --node-active: #2f4a3c;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  --font-ui: "IBM Plex Sans JP", sans-serif;
  --font-brand: "Shippori Mincho", serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html,
body {
  margin: 0;
  height: 100%;
  background: var(--bg-deep);
  color: var(--ink);
  font-family: var(--font-ui);
  overflow: hidden;
}

body {
  background:
    radial-gradient(1200px 700px at 12% -10%, rgba(126, 200, 163, 0.14), transparent 55%),
    radial-gradient(900px 600px at 95% 15%, rgba(201, 232, 122, 0.08), transparent 50%),
    radial-gradient(800px 500px at 50% 110%, rgba(60, 100, 85, 0.25), transparent 60%),
    linear-gradient(160deg, #0c1210 0%, #122018 45%, #0e1512 100%);
}

.app {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid rgba(126, 200, 163, 0.12);
  background: linear-gradient(180deg, rgba(18, 28, 24, 0.88), rgba(14, 21, 18, 0.55));
  backdrop-filter: blur(12px);
  z-index: 5;
  animation: bar-in 0.7s var(--ease) both;
}

@keyframes bar-in {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  min-width: 0;
}

.brand-mark {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 35%, var(--accent-hot), transparent 42%),
    radial-gradient(circle at 70% 65%, var(--accent), transparent 50%),
    #1a2c24;
  box-shadow: 0 0 0 1px rgba(126, 200, 163, 0.35), 0 8px 24px rgba(0, 0, 0, 0.35);
  position: relative;
  flex-shrink: 0;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 28% 42% auto 42%;
  height: 42%;
  border-radius: 999px;
  background: rgba(14, 21, 18, 0.7);
  transform-origin: top center;
  transform: rotate(-18deg);
}

.brand-name {
  margin: 0;
  font-family: var(--font-brand);
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.1;
}

.brand-sub {
  margin: 0.15rem 0 0;
  color: var(--ink-mute);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: flex-end;
}

.view-toggle {
  display: inline-flex;
  padding: 0.15rem;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid rgba(126, 200, 163, 0.18);
  margin-right: 0.25rem;
}

.tool-btn {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink-mute);
  font: inherit;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.2s, background 0.2s, border-color 0.2s, transform 0.2s;
}

.view-toggle .tool-btn {
  border-radius: 999px;
}

.tool-btn:hover {
  color: var(--ink);
  background: var(--accent-soft);
}

.tool-btn.is-active {
  color: var(--bg-deep);
  background: var(--accent);
  border-color: transparent;
}

.tool-btn.danger:hover {
  color: #fff;
  background: rgba(224, 122, 106, 0.25);
  border-color: rgba(224, 122, 106, 0.4);
}

.workspace {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr;
  min-height: 0;
  position: relative;
}

.workspace.editor-open {
  grid-template-columns: 1fr min(380px, 42vw);
}

.canvas-wrap {
  position: relative;
  overflow: hidden;
  cursor: grab;
  min-height: 0;
}

.canvas-wrap.is-panning {
  cursor: grabbing;
}

.canvas-hint {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  z-index: 2;
  color: var(--ink-faint);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  pointer-events: none;
  animation: hint-fade 1.2s var(--ease) 0.4s both;
}

@keyframes hint-fade {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.links,
.canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform-origin: 0 0;
  will-change: transform;
}

.links {
  overflow: visible;
  pointer-events: none;
  z-index: 1;
}

.canvas {
  z-index: 2;
}

.link-path {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.6;
  stroke-linecap: round;
  opacity: 0;
  animation: link-draw 0.55s var(--ease) forwards;
}

@keyframes link-draw {
  from {
    opacity: 0;
    stroke-dasharray: 8 120;
    stroke-dashoffset: 40;
  }
  to {
    opacity: 1;
    stroke-dasharray: none;
    stroke-dashoffset: 0;
  }
}

.node {
  position: absolute;
  min-width: 7.5rem;
  max-width: 13rem;
  padding: 0.7rem 0.9rem 0.65rem;
  border-radius: 14px;
  background: linear-gradient(165deg, rgba(48, 72, 60, 0.95), rgba(30, 44, 37, 0.98));
  border: 1px solid var(--node-border);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.28);
  cursor: pointer;
  user-select: none;
  transition:
    border-color 0.2s,
    box-shadow 0.25s,
    transform 0.25s var(--ease),
    background 0.2s;
  animation: node-in 0.45s var(--ease) both;
}

@keyframes node-in {
  from {
    opacity: 0;
    transform: scale(0.86);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.node:hover {
  border-color: rgba(126, 200, 163, 0.55);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.38), 0 0 0 1px rgba(126, 200, 163, 0.15);
}

.node.is-selected {
  background: linear-gradient(165deg, #3a5a4a, #2a4338);
  border-color: var(--accent);
  box-shadow:
    0 0 0 2px rgba(126, 200, 163, 0.35),
    0 16px 40px rgba(0, 0, 0, 0.4);
  z-index: 3;
}

.node.is-root {
  background: linear-gradient(165deg, #456555, #2f463c);
  border-color: rgba(201, 232, 122, 0.45);
}

.node-label {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: 0.02em;
  word-break: break-word;
}

.node-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.4rem;
  color: var(--ink-mute);
  font-size: 0.68rem;
  letter-spacing: 0.03em;
}

.node-badge .dot {
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--accent-hot);
  box-shadow: 0 0 8px rgba(201, 232, 122, 0.6);
}

.node-badge.collapsed-hint .dot {
  background: var(--ink-faint);
  box-shadow: none;
}

.node-collapse {
  position: absolute;
  right: -0.55rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1.15rem;
  height: 1.15rem;
  border-radius: 50%;
  border: 1px solid rgba(126, 200, 163, 0.4);
  background: var(--bg-lift);
  color: var(--accent);
  font-size: 0.7rem;
  line-height: 1;
  display: grid;
  place-items: center;
  cursor: pointer;
  z-index: 4;
  padding: 0;
}

.node-collapse:hover {
  background: var(--accent);
  color: var(--bg-deep);
}

.editor {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.1rem 1.15rem 1.25rem;
  background: var(--panel);
  border-left: 1px solid rgba(126, 200, 163, 0.14);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
  animation: panel-in 0.4s var(--ease) both;
  min-height: 0;
}

.editor[hidden] {
  display: none !important;
}

@keyframes panel-in {
  from {
    opacity: 0;
    transform: translateX(18px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

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

.editor-label {
  margin: 0;
  color: var(--accent);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: none;
}

.icon-btn {
  appearance: none;
  width: 2rem;
  height: 2rem;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--ink-mute);
  font-size: 1.25rem;
  cursor: pointer;
}

.icon-btn:hover {
  background: var(--accent-soft);
  color: var(--ink);
}

.node-title-input,
.node-body-input {
  width: 100%;
  border: 1px solid rgba(126, 200, 163, 0.2);
  border-radius: 12px;
  background: rgba(8, 14, 12, 0.55);
  color: var(--ink);
  font: inherit;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.node-title-input:focus,
.node-body-input:focus {
  border-color: rgba(126, 200, 163, 0.55);
  box-shadow: 0 0 0 3px rgba(126, 200, 163, 0.12);
}

.node-title-input {
  padding: 0.75rem 0.9rem;
  font-family: var(--font-brand);
  font-size: 1.15rem;
  letter-spacing: 0.04em;
}

.node-body-input {
  flex: 1;
  min-height: 12rem;
  padding: 0.9rem;
  line-height: 1.75;
  resize: none;
  font-size: 0.92rem;
}

.node-title-input::placeholder,
.node-body-input::placeholder {
  color: var(--ink-faint);
}

.editor-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.action-btn {
  appearance: none;
  border: 1px solid rgba(126, 200, 163, 0.28);
  background: var(--accent-soft);
  color: var(--ink);
  font: inherit;
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  padding: 0.5rem 0.75rem;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.action-btn:hover {
  background: rgba(126, 200, 163, 0.28);
  border-color: rgba(126, 200, 163, 0.5);
}

.action-btn.ghost {
  background: transparent;
}

.action-btn.danger {
  border-color: rgba(224, 122, 106, 0.35);
  color: #f0b4ab;
  background: rgba(224, 122, 106, 0.08);
  margin-left: auto;
}

.action-btn.danger:hover {
  background: rgba(224, 122, 106, 0.22);
}

.editor-meta {
  margin: 0;
  color: var(--ink-faint);
  font-size: 0.72rem;
}

/* Auth gate */
.auth-gate {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 1.25rem;
  background:
    radial-gradient(900px 500px at 20% 10%, rgba(126, 200, 163, 0.18), transparent 55%),
    radial-gradient(700px 400px at 90% 80%, rgba(201, 232, 122, 0.1), transparent 50%),
    rgba(8, 12, 10, 0.72);
  backdrop-filter: blur(10px);
}

.auth-gate[hidden] {
  display: none !important;
}

.auth-card {
  width: min(440px, 100%);
  padding: 1.75rem 1.5rem 1.5rem;
  border-radius: 22px;
  border: 1px solid rgba(126, 200, 163, 0.22);
  background: linear-gradient(165deg, rgba(28, 42, 36, 0.96), rgba(14, 21, 18, 0.98));
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  animation: panel-in 0.45s var(--ease) both;
}

.auth-brand {
  text-align: center;
  margin-bottom: 1.25rem;
}

.auth-brand .brand-mark {
  display: inline-block;
  margin-bottom: 0.75rem;
}

.auth-brand .brand-name {
  margin-bottom: 0.4rem;
}

.auth-lead {
  margin: 0;
  color: var(--ink-mute);
  font-size: 0.88rem;
  line-height: 1.6;
}

.auth-setup-title {
  margin: 0 0 0.6rem;
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.auth-steps {
  margin: 0 0 0.9rem;
  padding-left: 1.2rem;
  color: var(--ink-mute);
  font-size: 0.8rem;
  line-height: 1.65;
}

.auth-steps a {
  color: var(--accent-hot);
}

.auth-steps code,
.auth-note code {
  font-size: 0.78em;
  color: var(--accent);
}

.auth-config-input {
  width: 100%;
  min-height: 7.5rem;
  margin-bottom: 0.7rem;
  padding: 0.75rem;
  border-radius: 12px;
  border: 1px solid rgba(126, 200, 163, 0.22);
  background: rgba(8, 14, 12, 0.55);
  color: var(--ink);
  font: inherit;
  font-size: 0.78rem;
  line-height: 1.45;
  resize: vertical;
}

.auth-btn {
  appearance: none;
  width: 100%;
  border: 1px solid rgba(126, 200, 163, 0.3);
  border-radius: 12px;
  padding: 0.8rem 1rem;
  font: inherit;
  font-size: 0.92rem;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s, border-color 0.2s;
}

.auth-btn.primary {
  background: var(--accent);
  color: var(--bg-deep);
  border-color: transparent;
  font-weight: 600;
}

.auth-btn.primary:hover {
  background: var(--accent-hot);
}

.auth-btn.google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  background: rgba(255, 255, 255, 0.96);
  color: #222;
  border-color: transparent;
  font-weight: 500;
}

.auth-btn.google:hover {
  transform: translateY(-1px);
  background: #fff;
}

.google-g {
  display: grid;
  place-items: center;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  background: #fff;
  color: #4285f4;
  font-weight: 700;
  font-family: Arial, sans-serif;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.08);
}

.auth-note {
  margin: 0.75rem 0 0;
  color: var(--ink-faint);
  font-size: 0.74rem;
  line-height: 1.55;
}

.auth-error {
  margin: 0.75rem 0 0;
  color: #f0b4ab;
  font-size: 0.8rem;
  line-height: 1.5;
}

.auth-loading {
  text-align: center;
  color: var(--ink-mute);
  padding: 1.5rem 0;
  letter-spacing: 0.06em;
}

.user-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.15rem 0.2rem 0.15rem 0.35rem;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid rgba(126, 200, 163, 0.18);
  margin-right: 0.25rem;
  max-width: min(240px, 42vw);
}

.user-avatar {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  object-fit: cover;
}

.user-email {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.72rem;
  color: var(--ink-mute);
  max-width: 9rem;
}

@media (max-width: 820px) {
  .topbar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.65rem;
  }

  .toolbar {
    justify-content: flex-start;
  }

  .workspace.editor-open {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr min(48vh, 360px);
  }

  .editor {
    border-left: none;
    border-top: 1px solid rgba(126, 200, 163, 0.14);
  }

  .brand-sub {
    display: none;
  }
}