/* ── Tokens ── */

:root {
  --background:               #f9f9f9;
  --surface:                  #ffffff;
  --primary:                  #000000;
  --on-primary:               #ffffff;
  --on-surface:               #1a1c1c;
  --on-surface-variant:       #4c4546;
  --outline:                  #7e7576;
  --outline-variant:          #cfc4c5;
  --surface-container:        #eeeeee;
  --surface-container-high:   #e8e8e8;
  --surface-container-highest:#e2e2e2;
  --error:                    #ba1a1a;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --space-xs:    4px;
  --space-xs2:   6px;
  --space-sm:    8px;
  --space-md:    16px;
  --space-lg:    24px;
  --space-xl:    32px;
  --side-margin: 20px;

  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;

  --text-xs:      11px;
  --text-sm:      12px;
  --text-base:    14px;
  --text-md:      16px;
  --text-lg:      18px;
  --text-xl:      20px;
  --text-2xl:     24px;
  --text-display: 64px;

  --max-width:        600px;
  --header-height:    64px;
  --bottomnav-height: 72px;
}

/* ── Reset ── */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── Base ── */

body {
  font-family: var(--font-sans);
  background-color: var(--background);
  color: var(--on-surface);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100dvh;
}

/* ── Icon base ── */

.icon {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 1.5;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  display: inline-block;
  vertical-align: middle;
  flex-shrink: 0;
}

/* ── Layout ── */

.app-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md) var(--side-margin) calc(var(--bottomnav-height) + env(safe-area-inset-bottom) + var(--space-md));
}

/* ── Header ── */

.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--surface);
  border-bottom: 1px solid var(--outline-variant);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.header-content {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--side-margin);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: inherit;
}

.logo h1 {
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-transform: lowercase;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* ── Bottom nav ── */

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottomnav-height);
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--surface);
  border-top: 1px solid var(--outline-variant);
  display: flex;
  align-items: stretch;
  z-index: 50;
}

.nav-content {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: stretch;
}

.nav-tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  text-decoration: none;
  color: var(--on-surface);
  opacity: 0.4;
}

.nav-tab.active {
  color: var(--primary);
  opacity: 1;
}

.nav-label {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ── Buttons ── */

.sort-button {
  display: flex;
  align-items: center;
  gap: var(--space-xs2);
  padding: var(--space-xs2) 10px;
  border: 1px solid var(--outline-variant);
  background: var(--surface);
  text-decoration: none;
  color: var(--on-surface);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background 0.1s;
}

.sort-button:active {
  background: var(--surface-container);
}

.sort-label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.close-btn {
  display: flex;
  align-items: center;
  padding: var(--space-sm);
  color: var(--on-surface-variant);
  border-radius: 50%;
  text-decoration: none;
}

.back-btn {
  display: flex;
  align-items: center;
  padding: var(--space-sm);
  color: var(--on-surface-variant);
  text-decoration: none;
  margin-right: var(--space-sm);
}

.page-title {
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* General purpose btn variants (profile, dialog) */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 16px;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: var(--radius-md);
  font-family: inherit;
  transition: opacity 0.2s;
  text-decoration: none;
}

.btn:active { opacity: 0.8; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: var(--primary);
  border: 1px solid var(--primary);
  color: var(--on-primary);
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary);
}

.btn-logout {
  background: transparent;
  border: 1px solid var(--error);
  color: var(--error);
  width: 100%;
}

.btn-lg {
  padding: 18px;
  font-size: var(--text-lg);
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0;
}

.btn-full {
  width: 100%;
  margin-top: var(--space-sm);
}

.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--on-surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: background 0.15s;
}

.icon-btn:hover { background: var(--surface-container); }

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

/* ── Forms (shared) ── */

.field-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs2);
}

label,
.field-label,
.section-label {
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

label,
.field-label {
  font-size: var(--text-xs);
  color: var(--on-surface-variant);
}

/* Shared input base */
.input-underline,
.input-box {
  width: 100%;
  font-size: var(--text-md);
  color: var(--on-surface);
  outline: none;
  transition: border-color 0.2s ease;
  font-family: inherit;
}

/* Bottom-border inputs */
.input-underline {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--outline-variant);
  padding: 10px 0;
  border-radius: 0;
}

.input-underline:focus {
  border-bottom-color: var(--primary);
}

input::placeholder,
textarea::placeholder { color: rgba(126, 117, 118, 0.4); }

/* Full-border inputs */
select,
textarea,
input[type="date"],
input[type="number"] {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--outline-variant);
  padding: 10px var(--space-sm);
  font-size: var(--text-md);
  color: var(--on-surface);
  outline: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  transition: border-color 0.2s ease;
  appearance: none;
}

select:focus,
textarea:focus,
input[type="date"]:focus,
input[type="number"]:focus { border-color: var(--primary); }

textarea { min-height: 120px; resize: none; padding: var(--space-md); }

.select-wrapper { position: relative; }

.select-wrapper::after {
  content: '';
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
  width: 6px;
  height: 6px;
  border-right: 2px solid var(--on-surface-variant);
  border-bottom: 2px solid var(--on-surface-variant);
  pointer-events: none;
}

.password-wrapper { position: relative; }

.toggle-btn {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--on-surface-variant);
  padding: var(--space-xs);
  display: flex;
  align-items: center;
}

.error-message,
.form-error {
  font-size: var(--text-base);
  color: var(--error);
}

/* ── Login ── */

.login-main {
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  padding: var(--side-margin);
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  min-height: 100dvh;
  justify-content: center;
}

.hero-container {
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(207, 196, 197, 0.4);
  line-height: 0;
}

.hero-image {
  width: 100%;
  height: auto;
  max-height: 240px;
  object-fit: cover;
  filter: grayscale(100%);
}

.login-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  opacity: 0.3;
}

.footer-line {
  height: 1px;
  width: 40px;
  background-color: var(--outline);
}

.version-text {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* ── Task list ── */

.task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.task-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: 20px 0;
  border-bottom: 1px solid var(--surface-container-high);
  transition: opacity 2s ease;
}


.checkbox {
  width: 22px;
  height: 22px;
  min-width: 22px;
  border: 2px solid var(--primary);
  background: transparent;
  cursor: pointer;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  margin-top: 2px;
  padding: 0;
  flex-shrink: 0;
}

.task-content {
  flex: 1;
  min-width: 0;
}

.task-title {
  display: block;
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--on-surface);
  margin-bottom: var(--space-xs2);
}

.task-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.context-tag {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--on-surface-variant);
  border: 1px solid var(--outline-variant);
  padding: 2px 8px;
  text-transform: capitalize;
  white-space: nowrap;
}

.due-date {
  font-size: var(--text-base);
  color: var(--on-surface-variant);
  opacity: 0.6;
}

.priority-badge {
  width: 24px;
  height: 24px;
  min-width: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-container-highest);
  border-radius: 50%;
  font-size: var(--text-sm);
  font-weight: 700;
  margin-top: 2px;
}

.empty-state {
  padding: var(--space-xl) 0;
  color: var(--on-surface-variant);
  font-size: var(--text-md);
}

/* ── Completion animation ── */

.task-item.completing { opacity: 0.3; }

.task-item.completing .checkbox { background-color: var(--primary); }

.task-item.completing .checkbox::after {
  content: '';
  width: 6px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-bottom: 2px;
}

.task-item.completing .task-title { text-decoration: line-through; }

/* ── Add Task ── */

.add-main { padding-top: var(--space-xl); }

.stacked-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.profile-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.input-box {
  background: var(--surface);
  border: 1px solid var(--outline-variant);
  padding: 10px var(--space-sm);
  border-radius: var(--radius-md);
}

.input-box:focus {
  border-color: var(--primary);
}

.submit-container { margin-top: var(--space-md); }

/* ── Profile ── */

.profile-section {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--surface-container-high);
}

.profile-section:last-child { border-bottom: none; }

.section-label {
  font-size: var(--text-sm);
  color: var(--on-surface-variant);
  margin-bottom: var(--space-md);
}

/* Context list */

.context-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: var(--space-md);
}

.context-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
}

.context-icon {
  display: flex;
  align-items: center;
  color: var(--on-surface-variant);
}

.context-name {
  flex: 1;
  font-size: var(--text-md);
}

.context-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}


.add-context-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: none;
  border: 1px dashed var(--outline-variant);
  color: var(--on-surface-variant);
  font-size: var(--text-base);
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: background 0.15s, border-color 0.15s;
  width: 100%;
  justify-content: center;
}

.add-context-btn:hover {
  background: var(--surface-container);
  border-color: var(--outline);
}

/* Account list */

.account-list {
  list-style: none;
  margin-bottom: var(--space-md);
}

.account-item { border-bottom: 1px solid var(--surface-container-high); }
.account-item:first-child { border-top: 1px solid var(--surface-container-high); }

.account-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) 0;
  text-decoration: none;
  color: var(--on-surface);
  font-size: var(--text-md);
}

.logout-form .btn-logout { margin-top: var(--space-sm); }

/* ── Context dialog ── */

dialog {
  position: fixed;
  inset: 0;
  margin: auto;
  width: calc(100% - 48px);
  max-width: 360px;
  max-height: calc(100dvh - 48px);
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
}

.context-dialog h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-lg);
}

.context-dialog form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.icon-grid-container {
  border: 1px solid var(--outline-variant);
  background: var(--surface);
  padding: var(--space-xs);
}

.icon-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-xs);
}

/* Override icon-btn inside the grid */
.icon-grid .icon-btn {
  aspect-ratio: 1;
  padding: var(--space-sm);
  color: var(--primary);
  border-radius: 0;
}

.icon-grid .icon-btn.active {
  background: var(--primary);
  color: var(--on-primary);
}

/* Active icon svg fill override (for Lucide icons using fill="none") */
.icon-grid .icon-btn.active .icon {
  stroke: var(--on-primary);
}

.dialog-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.dialog-actions .btn { flex: 1; }

/* ── 404 ── */

.error-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  gap: var(--space-md);
  text-align: center;
  padding: var(--side-margin);
}

.error-main h1 {
  font-size: var(--text-display);
  font-weight: 700;
}

.error-main a { color: var(--primary); }

/* ── Animations ── */

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

.spin { animation: spin 0.8s linear infinite; }