:root {
  --bg: #f4f6f5;
  --panel: #ffffff;
  --panel-alt: #fafbfa;
  --sidebar: #ffffff;
  --border: #e6eae8;
  --border-strong: #d5dbd8;
  --text: #17211d;
  --text-muted: #8a938e;
  --text-soft: #616b66;
  --primary: #16a34a;
  --primary-hover: #12833c;
  --primary-soft: #e8f6ee;
  --primary-text: #ffffff;
  --hover: #f1f4f2;
  --input-bg: #ffffff;
  --danger: #e5484d;
  --shadow-sm: 0 1px 2px rgba(20, 40, 30, 0.05);
  --shadow-md: 0 4px 16px rgba(20, 40, 30, 0.06);
  --shadow-lg: 0 20px 50px rgba(20, 40, 30, 0.14);
  --radius: 14px;
  --radius-sm: 10px;
  --status-done: #16a34a;
  --status-doing: #f5a524;
  --status-todo: #9aa4a0;
}

[data-theme="dark"] {
  --bg: #0d100e;
  --panel: #151915;
  --panel-alt: #1a1f1b;
  --sidebar: #131711;
  --border: #232a25;
  --border-strong: #2f3830;
  --text: #e7ede9;
  --text-muted: #79837d;
  --text-soft: #9aa39d;
  --primary: #22c55e;
  --primary-hover: #16a34a;
  --primary-soft: #16281c;
  --primary-text: #06210f;
  --hover: #1c221d;
  --input-bg: #1a1f1b;
  --danger: #ff6060;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.6);
  --status-done: #2ecc82;
  --status-doing: #ffb648;
  --status-todo: #6f7a74;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN",
    "Malgun Gothic", "Apple SD Gothic Neo", Roboto, "Noto Sans", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

.app {
  display: flex;
  min-height: 100vh;
}

/* -------------------- Sidebar -------------------- */
.sidebar {
  width: 248px;
  flex: 0 0 248px;
  background: var(--sidebar);
  border-right: 1px solid var(--border);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
}

.brand-logo {
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  border-radius: 11px;
  background: linear-gradient(135deg, #16a34a, #22c55e 60%, #4ade80);
  color: #fff;
  font-weight: 800;
  font-size: 19px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(22, 163, 74, 0.35);
}

.brand-title {
  font-weight: 800;
  font-size: 15px;
  letter-spacing: -0.01em;
}

.brand-sub {
  font-size: 11.5px;
  color: var(--text-muted);
  margin-top: 1px;
}

.status-badge {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid color-mix(in srgb, var(--primary) 25%, transparent);
  padding: 4px 10px;
  border-radius: 20px;
}

.status-badge::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 22%, transparent);
}

.sync-status {
  font-size: 11.5px;
  font-weight: 650;
  margin-top: -6px;
  color: var(--text-muted);
}

.sync-status.saved {
  color: var(--primary);
}

.sync-status.saving {
  color: var(--text-soft);
}

.sync-status.offline {
  color: var(--status-doing);
}

.sync-status.hidden {
  display: none;
}

.side-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.dl-row {
  display: flex;
  gap: 8px;
}

.dl-row .btn {
  flex: 1 1 0;
  text-align: center;
  padding: 8px 6px;
}

.side-section {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding-top: 4px;
}

.side-label {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  margin-top: 6px;
}

.side-footer {
  margin-top: auto;
  font-size: 11px;
  line-height: 1.6;
  white-space: pre-line;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 14px;
}

/* -------------------- Segmented toggle -------------------- */
.seg {
  display: inline-flex;
  background: var(--hover);
  border: 1px solid var(--border);
  border-radius: 11px;
  padding: 3px;
  gap: 3px;
  width: fit-content;
}

.seg button {
  border: none;
  background: transparent;
  color: var(--text-soft);
  font-weight: 700;
  font-size: 13px;
  padding: 6px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.14s, color 0.14s, box-shadow 0.14s;
  line-height: 1;
}

.seg button:hover:not(.active) {
  color: var(--text);
}

.seg button.active {
  background: var(--primary);
  color: var(--primary-text);
  box-shadow: 0 2px 6px rgba(22, 163, 74, 0.35);
}

/* -------------------- Buttons -------------------- */
.btn {
  border: 1px solid var(--border-strong);
  background: var(--panel);
  color: var(--text);
  padding: 9px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 650;
  transition: transform 0.08s, background 0.15s, border-color 0.15s, box-shadow 0.15s;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  text-align: left;
}

.btn:hover {
  background: var(--hover);
  border-color: var(--text-muted);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--primary);
  color: var(--primary-text);
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(22, 163, 74, 0.3);
}

.btn-primary:hover {
  background: var(--primary-hover);
  border-color: transparent;
}

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  box-shadow: none;
}

.btn-icon {
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 7px;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1;
  transition: background 0.12s, color 0.12s;
}

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

.btn-icon.danger:hover {
  color: var(--danger);
  background: color-mix(in srgb, var(--danger) 12%, transparent);
}

/* -------------------- Main -------------------- */
.main {
  flex: 1 1 auto;
  min-width: 0;
  padding: 30px 34px 80px;
  max-width: 1400px;
}

.demo-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  margin-bottom: 18px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 650;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid color-mix(in srgb, var(--primary) 30%, transparent);
}

.demo-banner.hidden {
  display: none;
}

.demo-back {
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
  white-space: nowrap;
  padding: 4px 10px;
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, var(--primary) 30%, transparent);
}

.demo-back:hover {
  background: color-mix(in srgb, var(--primary) 12%, transparent);
}

.page-head {
  margin-bottom: 22px;
}

.page-head h1 {
  font-size: 24px;
  font-weight: 800;
  margin: 0 0 6px;
  letter-spacing: -0.02em;
}

.page-head p {
  margin: 0;
  color: var(--text-soft);
  font-size: 13.5px;
  line-height: 1.5;
}

.board {
  overflow-x: auto;
  padding-bottom: 6px;
}

.board-inner {
  min-width: 1080px;
}

.table-head,
.row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.table-head {
  padding: 4px 16px 10px;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.col-toggle {
  width: 24px;
  flex: 0 0 24px;
  text-align: center;
}

.col-title {
  flex: 1 1 auto;
  min-width: 156px;
  display: flex;
  align-items: center;
}

.col-field {
  flex: 0 0 120px;
  display: flex;
  align-items: center;
  gap: 4px;
  position: relative;
}

.col-actions {
  flex: 0 0 74px;
  display: flex;
  gap: 2px;
  justify-content: flex-end;
}

.col-field.col-wide {
  flex: 1 1 170px;
  min-width: 150px;
}

.col-field .col-del {
  opacity: 0;
  transition: opacity 0.12s;
  margin-left: auto;
}

.table-head:hover .col-field .col-del {
  opacity: 0.8;
}

/* -------------------- Project card -------------------- */
.project {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.project:hover {
  box-shadow: var(--shadow-lg);
}

.project-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: linear-gradient(
    to right,
    color-mix(in srgb, var(--primary) 5%, var(--panel-alt)),
    var(--panel-alt)
  );
  border-bottom: 1px solid transparent;
}

.project.expanded .project-head {
  border-bottom-color: var(--border);
}

.project-name {
  font-weight: 750;
  font-size: 15.5px;
  flex: 1 1 auto;
  letter-spacing: -0.01em;
}

.task-count {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--text-soft);
  background: var(--hover);
  border: 1px solid var(--border);
  padding: 3px 9px;
  border-radius: 20px;
  white-space: nowrap;
}

/* -------------------- Rows -------------------- */
.project-body {
  padding: 4px 0;
}

.row {
  padding: 5px 16px;
  position: relative;
  transition: background 0.1s;
}

.row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: transparent;
  transition: background 0.12s;
}

.row:hover {
  background: var(--hover);
}

.row:hover::before {
  background: var(--primary);
}

.row:hover .col-actions .btn-icon {
  opacity: 1;
}

.col-actions .btn-icon {
  opacity: 0;
  transition: opacity 0.12s;
}

.toggle {
  cursor: pointer;
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 12px;
  user-select: none;
  font-weight: 800;
  border: 1px solid transparent;
}

.toggle:hover {
  background: var(--primary-soft);
  color: var(--primary);
  border-color: color-mix(in srgb, var(--primary) 25%, transparent);
}

.toggle.leaf {
  cursor: default;
  visibility: hidden;
}

/* Tree indent guide */
.indent {
  position: relative;
  flex: 0 0 auto;
  align-self: stretch;
}

.indent i {
  display: inline-block;
  width: 22px;
  height: 100%;
  position: relative;
}

.indent i::before {
  content: "";
  position: absolute;
  left: 10px;
  top: -6px;
  bottom: -6px;
  border-left: 1.5px dashed var(--border-strong);
  opacity: 0.7;
}

/* -------------------- Inline inputs -------------------- */
.cell-input {
  flex: 1 1 0;
  width: 100%;
  min-width: 0;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  padding: 6px 8px;
  border-radius: 8px;
  font-size: 13px;
  font-family: inherit;
  transition: border-color 0.12s, background 0.12s, box-shadow 0.12s;
}

.cell-input:hover {
  border-color: var(--border-strong);
  background: var(--input-bg);
}

.cell-input:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--input-bg);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 16%, transparent);
}

.title-input {
  font-weight: 550;
  font-size: 13.5px;
}

input[type="date"].cell-input {
  color-scheme: light;
}

[data-theme="dark"] input[type="date"].cell-input {
  color-scheme: dark;
}

/* Status cell with colored dot */
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: 0 0 8px;
  background: var(--status-todo);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--status-todo) 20%, transparent);
}

.status-dot.done {
  background: var(--status-done);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--status-done) 20%, transparent);
}

.status-dot.doing {
  background: var(--status-doing);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--status-doing) 20%, transparent);
}

/* Progress cell with mini bar */
.progress-wrap {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.progress-track {
  height: 4px;
  border-radius: 4px;
  background: var(--border);
  overflow: hidden;
  margin: 0 8px;
}

.progress-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, #16a34a, #4ade80);
  transition: width 0.25s ease;
}

/* -------------------- Empty state -------------------- */
.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 80px 20px;
  font-size: 15px;
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--panel) 50%, transparent);
}

.empty-state.hidden {
  display: none;
}

/* -------------------- Modal -------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 25, 20, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fade 0.15s ease;
}

@keyframes fade {
  from {
    opacity: 0;
  }
}

.modal-overlay.hidden {
  display: none;
}

.modal {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  width: 360px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 16px;
  animation: pop 0.16s ease;
}

@keyframes pop {
  from {
    transform: translateY(8px) scale(0.98);
    opacity: 0;
  }
}

.modal h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 750;
}

.modal label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12.5px;
  color: var(--text-soft);
  font-weight: 650;
}

.modal input,
.modal select {
  border: 1px solid var(--border-strong);
  background: var(--input-bg);
  color: var(--text);
  padding: 10px 11px;
  border-radius: 10px;
  font-size: 14px;
  font-family: inherit;
}

.modal input:focus,
.modal select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 16%, transparent);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 4px;
}

/* -------------------- Responsive -------------------- */
@media (max-width: 820px) {
  .app {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    flex: none;
    height: auto;
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .main {
    padding: 20px 16px 60px;
  }
}