/* ==========================================================================
   Tikt Design System
   37signals-inspired: utilitarian, warm, focused
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Colors - warm, honest palette */
  --color-ink: #1d1d1d;
  --color-ink-light: #555;
  --color-ink-muted: #888;
  --color-paper: #fffef9;
  --color-paper-warm: #faf8f3;
  --color-border: #e5e2da;
  --color-border-strong: #d0cdc5;

  /* Accent - purposeful yellow (like Basecamp) */
  --color-accent: #ffcc00;
  --color-accent-hover: #e6b800;

  /* Semantic */
  --color-success: #2e7d32;
  --color-success-bg: #e8f5e9;
  --color-warning: #f57c00;
  --color-warning-bg: #fff3e0;
  --color-danger: #c62828;
  --color-danger-bg: #ffebee;
  --color-info: #1565c0;
  --color-info-bg: #e3f2fd;

  /* Typography - system stack with character */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, Monaco, monospace;

  /* Type scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Layout */
  --container-max: 64rem;
  --container-narrow: 48rem;

  /* Borders */
  --radius-sm: 3px;
  --radius-md: 5px;
  --radius-lg: 8px;

  /* Shadows - subtle, functional */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 2px 4px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.08);
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-ink);
  background: var(--color-paper);
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p {
  margin: 0 0 var(--space-4);
}

a {
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: var(--color-border-strong);
  text-underline-offset: 2px;
  transition: text-decoration-color 0.15s;
}

a:hover {
  text-decoration-color: var(--color-ink);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.container--narrow {
  max-width: var(--container-narrow);
}

/* App shell */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app__main {
  flex: 1;
  padding: var(--space-6) 0 var(--space-12);
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.nav {
  background: var(--color-ink);
  color: white;
  padding: var(--space-3) 0;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.nav__brand {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: white;
  text-decoration: none;
}

.nav__brand:hover {
  color: var(--color-accent);
}

.nav__links {
  display: flex;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav__link {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: background 0.15s, color 0.15s;
}

.nav__link:hover,
.nav__link--active {
  color: white;
  background: rgba(255,255,255,0.1);
}

.nav__link--active {
  background: rgba(255,255,255,0.15);
}

/* Mobile nav */
@media (max-width: 640px) {
  .nav__inner {
    flex-wrap: wrap;
  }

  .nav__links {
    width: 100%;
    justify-content: flex-start;
    margin-top: var(--space-2);
    gap: 0;
  }

  .nav__link {
    padding: var(--space-2);
  }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Primary - bold yellow */
.btn--primary {
  background: var(--color-accent);
  color: var(--color-ink);
  border-color: var(--color-accent);
}

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

/* Secondary - outlined */
.btn--secondary {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-border-strong);
}

.btn--secondary:hover {
  background: var(--color-paper-warm);
  border-color: var(--color-ink-muted);
}

/* Ghost - minimal */
.btn--ghost {
  background: transparent;
  color: var(--color-ink-light);
  border-color: transparent;
  padding: var(--space-1) var(--space-2);
}

.btn--ghost:hover {
  color: var(--color-ink);
  background: var(--color-paper-warm);
}

/* Danger */
.btn--danger {
  background: var(--color-danger);
  color: white;
  border-color: var(--color-danger);
}

.btn--danger:hover {
  background: #b71c1c;
  border-color: #b71c1c;
}

/* Sizes */
.btn--sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
}

.btn--lg {
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
}

/* Full width on mobile */
.btn--block {
  width: 100%;
}

/* --------------------------------------------------------------------------
   Forms
   -------------------------------------------------------------------------- */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink);
}

.form-hint {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.form-input,
.form-select,
.form-textarea {
  display: block;
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-family: inherit;
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-ink);
  background: white;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-ink);
  box-shadow: 0 0 0 3px rgba(0,0,0,0.05);
}

.form-input::placeholder {
  color: var(--color-ink-muted);
}

.form-input--error {
  border-color: var(--color-danger);
}

.form-error {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-danger);
}

/* Inline form */
.form-inline {
  display: flex;
  gap: var(--space-3);
  align-items: flex-end;
}

.form-inline .form-group {
  margin-bottom: 0;
  flex: 1;
}

.form-inline .btn {
  flex-shrink: 0;
}

@media (max-width: 640px) {
  .form-inline {
    flex-direction: column;
    align-items: stretch;
  }

  .form-inline .btn {
    width: 100%;
  }
}

/* Form row - side by side fields */
.form-row {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* --------------------------------------------------------------------------
   Tables
   -------------------------------------------------------------------------- */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.table th,
.table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.table th {
  font-weight: 600;
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--color-paper-warm);
}

.table tbody tr:hover {
  background: var(--color-paper-warm);
}

.table td:last-child {
  text-align: right;
}

/* Numeric columns */
.table .num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* Compact table */
.table--compact th,
.table--compact td {
  padding: var(--space-2) var(--space-3);
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.card__header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.card__title {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: 600;
}

.card__body {
  padding: var(--space-5);
}

.card__footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  background: var(--color-paper-warm);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* Card with no padding (for tables inside) */
.card--flush .card__body {
  padding: 0;
}

/* --------------------------------------------------------------------------
   Stats / Metrics
   -------------------------------------------------------------------------- */
.stats {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.stat {
  padding: var(--space-4);
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.stat__value {
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  margin-bottom: var(--space-1);
}

.stat__label {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* --------------------------------------------------------------------------
   Badges / Tags
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge--draft {
  background: var(--color-paper-warm);
  color: var(--color-ink-muted);
}

.badge--sent {
  background: var(--color-info-bg);
  color: var(--color-info);
}

.badge--paid {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.badge--overdue {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

/* --------------------------------------------------------------------------
   Flash Messages
   -------------------------------------------------------------------------- */
.flash {
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
}

.flash--notice {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.flash--alert {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

/* --------------------------------------------------------------------------
   Empty States
   -------------------------------------------------------------------------- */
.empty {
  text-align: center;
  padding: var(--space-12) var(--space-4);
  color: var(--color-ink-muted);
}

.empty__title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-ink-light);
  margin-bottom: var(--space-2);
}

.empty__text {
  margin-bottom: var(--space-4);
}

/* --------------------------------------------------------------------------
   Page Header
   -------------------------------------------------------------------------- */
.page-header {
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.page-header__title {
  margin: 0;
}

.page-header__actions {
  display: flex;
  gap: var(--space-2);
}

/* --------------------------------------------------------------------------
   List Items (for time entries, etc.)
   -------------------------------------------------------------------------- */
.entry-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.entry {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
  align-items: flex-start;
}

.entry:last-child {
  border-bottom: none;
}

.entry:hover {
  background: var(--color-paper-warm);
}

.entry__main {
  flex: 1;
  min-width: 0;
}

.entry__project {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin-bottom: var(--space-1);
}

.entry__description {
  font-weight: 500;
}

.entry__meta {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin-top: var(--space-1);
}

.entry__hours {
  font-size: var(--text-lg);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.entry__actions {
  display: flex;
  gap: var(--space-1);
  opacity: 0;
  transition: opacity 0.15s;
}

.entry:hover .entry__actions {
  opacity: 1;
}

@media (max-width: 640px) {
  .entry__actions {
    opacity: 1;
  }
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */
.text-muted { color: var(--color-ink-muted); }
.text-sm { font-size: var(--text-sm); }
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-danger { color: var(--color-danger); }

.font-mono { font-family: var(--font-mono); }
.font-bold { font-weight: 700; }

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }

.flex { display: flex; }
.flex-between { justify-content: space-between; }
.flex-center { align-items: center; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }

/* Hide but accessible */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* --------------------------------------------------------------------------
   Progress Bar (Budget)
   -------------------------------------------------------------------------- */
.progress-bar {
  height: 8px;
  background: var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background: var(--color-success);
  border-radius: var(--radius-sm);
  transition: width 0.3s ease;
}

.progress-bar__fill--danger {
  background: var(--color-danger);
}

/* --------------------------------------------------------------------------
   Turbo loading indicator
   -------------------------------------------------------------------------- */
.turbo-progress-bar {
  height: 3px;
  background: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Invoice Preview (document-style)
   -------------------------------------------------------------------------- */
.invoice-preview {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-8);
  max-width: 800px;
}

.invoice-preview__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-6);
  border-bottom: 2px solid var(--color-ink);
}

.invoice-preview__title {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin: 0;
  letter-spacing: 0.05em;
}

.invoice-preview__number {
  font-size: var(--text-lg);
  color: var(--color-ink-muted);
  margin: var(--space-1) 0 0;
}

.invoice-preview__status {
  display: flex;
  gap: var(--space-2);
}

.badge--lg {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
}

.invoice-preview__meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.invoice-preview__dates p {
  margin: var(--space-1) 0;
}

.invoice-preview__client p {
  margin: var(--space-1) 0;
}

.invoice-preview__table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-6);
}

.invoice-preview__table th,
.invoice-preview__table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.invoice-preview__table th {
  background: var(--color-paper-warm);
  font-weight: 600;
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-ink-muted);
}

.invoice-preview__table .num {
  text-align: right;
}

.invoice-preview__total {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-4) 0;
  border-top: 2px solid var(--color-ink);
  font-weight: 700;
}

.invoice-preview__total-amount {
  font-size: var(--text-2xl);
}

.invoice-preview__notes {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.invoice-preview__notes p {
  margin: var(--space-1) 0;
}

.invoice-preview__footer {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
}

@media (max-width: 640px) {
  .invoice-preview {
    padding: var(--space-4);
  }

  .invoice-preview__meta {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .invoice-preview__header {
    flex-direction: column;
    gap: var(--space-4);
  }
}