/* ========================================
   HomeStuff - Mobile-First Design
   Friendly utility with subtle playfulness
   ======================================== */

/* === CSS Reset & Base === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Duotone: White & Emerald Green */
  --color-bg: #ffffff;
  --color-surface: #ffffff;
  --color-border: #d1d5db;
  --color-text: #1f2937;
  --color-text-secondary: #4b5563;
  --color-text-muted: #9ca3af;
  
  /* Primary: Emerald Green */
  --color-primary: #047857;
  --color-primary-dark: #065f46;
  --color-primary-light: #ecfdf5;
  
  /* Semantic Colors */
  --color-success: #047857;
  --color-success-light: #ecfdf5;
  
  --color-warning: #b45309;
  --color-warning-light: #fef3c7;
  
  --color-danger: #b91c1c;
  --color-danger-light: #fef2f2;
  
  --color-info: #047857;
  --color-info-light: #ecfdf5;
  
  /* Status Colors */
  --color-low: var(--color-warning);
  --color-low-bg: var(--color-warning-light);
  --color-ok: var(--color-success);
  --color-ok-bg: var(--color-success-light);
  
  /* Spacing Scale (large tap targets) */
  --space-xs: 0.5rem;   /* 8px */
  --space-sm: 0.75rem;  /* 12px */
  --space-md: 1rem;     /* 16px */
  --space-lg: 1.5rem;   /* 24px */
  --space-xl: 2rem;     /* 32px */
  --space-2xl: 3rem;    /* 48px */
  
  /* Typography (readable at arm's length) */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;      /* 16px */
  --font-size-lg: 1.125rem;    /* 18px */
  --font-size-xl: 1.25rem;     /* 20px */
  --font-size-2xl: 1.5rem;     /* 24px */
  --font-size-3xl: 1.875rem;   /* 30px */
  
  /* Touch Target Minimum */
  --tap-target: 44px;
  
  /* Border Radius (subtle playfulness) */
  --radius-sm: 0.375rem;  /* 6px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* === Base Styles === */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding: var(--space-sm);
  padding-bottom: var(--space-2xl);
}

/* === Header === */
header {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--space-lg);
  padding: var(--space-md);
  position: sticky;
  top: var(--space-sm);
  z-index: 100;
  border-bottom: 3px solid var(--color-primary);
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

header h1 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

header h1 a {
  line-height: 0;
  display: block;
}

header h1 .logo {
  height: 120px;
  width: auto;
  display: block;
  cursor: pointer;
}

/* === Mobile Nav Toggle === */
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--tap-target);
  height: var(--tap-target);
  padding: 0;
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-toggle:hover,
.nav-toggle:focus {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
}

.hamburger {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  position: relative;
  transition: background 0.2s ease;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.2s ease;
}

.hamburger::before {
  top: -6px;
}

.hamburger::after {
  top: 6px;
}

/* Hamburger to X animation */
.nav-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* === Navigation === */
.nav-menu {
  display: none;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
}

.nav-menu.nav-open {
  display: grid;
}

nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
}

nav a {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  padding: var(--space-sm);
  min-height: var(--tap-target);
  text-decoration: none;
  color: var(--color-text);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all 0.2s ease;
  border: 2px solid transparent;
}

nav a:hover,
nav a:active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

nav a::before {
  content: '';
  font-size: var(--font-size-xl);
}

nav a[href="/"]::before { content: '🏠'; }
nav a[href*="storage"]::before { content: '📦'; }
nav a[href*="items"]::before { content: '📋'; }
nav a[href*="vendors"]::before { content: '🏪'; }
nav a[href*="restock"]::before { content: '🛒'; }

/* Logout button in nav */
.nav-menu form[action*="logout"] {
  margin: 0;
}

.nav-menu form[action*="logout"] button {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  width: 100%;
  padding: var(--space-sm);
  min-height: var(--tap-target);
  color: var(--color-danger);
  background: var(--color-danger-light);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-menu form[action*="logout"] button:hover,
.nav-menu form[action*="logout"] button:focus {
  background: var(--color-danger);
  color: white;
  border-color: var(--color-danger);
}

.nav-menu form[action*="logout"] button::before {
  content: '🚪';
  font-size: var(--font-size-xl);
}

/* === Cards === */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  border: 1px solid var(--color-border);
}

.card h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--space-lg);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.card h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.card h4 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-text-secondary);
}

.card ul {
  margin-left: var(--space-lg);
  margin-bottom: var(--space-md);
}

.card li {
  margin-bottom: var(--space-xs);
  line-height: 1.6;
}

/* === Forms === */
form {
  margin-bottom: var(--space-xl);
}

.form-group {
  margin-bottom: var(--space-md);
}

label {
  display: block;
  margin-bottom: var(--space-xs);
  font-weight: 600;
  font-size: var(--font-size-base);
  color: var(--color-text);
}

input[type="text"],
input[type="number"],
input[type="email"],
input[type="password"],
select,
textarea {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  min-height: var(--tap-target);
  font-size: var(--font-size-lg);
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

input[type="checkbox"] {
  width: 24px;
  height: 24px;
  cursor: pointer;
  accent-color: var(--color-primary);
}

.form-group.checkbox-group {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--space-sm);
}

.form-group.checkbox-group label {
  margin-bottom: 0;
  cursor: pointer;
}

.form-group.checkbox-group input[type="checkbox"] {
  width: 24px;
  flex-shrink: 0;
}

.form-inline {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

/* === Buttons === */
button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-height: var(--tap-target);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-lg);
  font-weight: 600;
  font-family: inherit;
  color: white;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

button:hover,
.btn:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

button:active,
.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

button.secondary {
  background: var(--color-text-secondary);
}

button.secondary:hover {
  background: var(--color-text);
}

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

button.danger:hover {
  background: #b91c1c;
}

button.success {
  background: var(--color-success);
}

button.success:hover {
  background: #047857;
}

button.small {
  min-height: 36px;
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-base);
  font-weight: 500;
}

button.qty-btn {
  min-width: 44px;
  min-height: 44px;
  font-size: var(--font-size-xl);
  font-weight: 700;
  padding: var(--space-sm);
}

button[type="submit"] {
  width: 100%;
  margin-top: var(--space-sm);
}

/* === Items Page Scale === */
.items-page {
  font-size: 0.67em;
}

.items-page h2 {
  font-size: 1.5em;
}

.items-page .form-group label,
.items-page .form-group input,
.items-page .form-group select,
.items-page button {
  font-size: 1em;
}

.items-page .item {
  padding: calc(var(--space-md) * 0.67);
  gap: calc(var(--space-md) * 0.67);
}

.items-page .item-info strong {
  font-size: 1.1em;
}

.items-page .item-info small {
  font-size: 0.9em;
}

.items-page .item-actions button {
  padding: calc(var(--space-xs) * 0.67) calc(var(--space-sm) * 0.67);
  font-size: 0.9em;
  min-height: calc(var(--tap-target) * 0.67);
}

/* === Items & Lists === */
.item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

.item:hover {
  box-shadow: var(--shadow-sm);
}

.item.below {
  background: var(--color-low-bg);
  border-color: var(--color-low);
}

.item-info {
  flex: 1;
  min-width: 0;
}

.item-info strong {
  display: block;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

.item-info small {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.4;
}

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

.item-actions input[type="checkbox"] {
  margin: 0;
}

/* === Vendor Groups === */
.vendor-group {
  margin-bottom: var(--space-xl);
}

.vendor-group h4 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-xl);
  border-left: 4px solid var(--color-primary);
}

.vendor-group h4::before {
  content: '🏪';
  font-size: var(--font-size-2xl);
}

/* Collapsible storage area header */
.area-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.area-toggle {
  background: var(--color-border);
  border: 2px solid var(--color-border);
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--color-text);
}

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

.area-toggle:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.area-toggle .chev {
  display: inline-block;
  transition: transform 0.2s ease;
}

.card.collapsed .chev {
  transform: rotate(-90deg);
}

/* hide items when collapsed */
.card.collapsed .item {
  display: none;
}

/* Label next to low checkbox */
.item-actions label.check-label {
  margin-left: 8px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  display: inline-flex;
  align-items: center;
  cursor: pointer;
}

/* === Empty States === */
.empty-state {
  padding: var(--space-2xl);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
  font-style: italic;
}

.empty-state::before {
  content: '📭';
  display: block;
  font-size: 4rem;
  margin-bottom: var(--space-md);
  opacity: 0.5;
}

/* === Logout Button === */
form[action*="logout"] {
  margin: 0;
}

form[action*="logout"] button {
  min-height: 36px;
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-sm);
  background: var(--color-text-secondary);
}

/* === Responsive Typography === */
@media (max-width: 639px) {
  :root {
    --space-xs: 0.375rem;
    --space-sm: 0.5rem;
    --space-md: 0.625rem;
    --space-lg: 0.875rem;
    --space-xl: 1.25rem;
    --space-2xl: 1.75rem;
    
    --font-size-sm: 0.75rem;
    --font-size-base: 0.875rem;
    --font-size-lg: 0.9375rem;
    --font-size-xl: 1rem;
    --font-size-2xl: 1.125rem;
    --font-size-3xl: 1.375rem;
    
    --tap-target: 36px;
    
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.625rem;
  }
  
  body {
    padding: 0.375rem;
    padding-bottom: 1.25rem;
  }
  
  header {
    padding: 0.5rem;
    margin-bottom: 0.625rem;
  }
  
  .card {
    padding: 0.625rem;
    margin-bottom: 0.625rem;
  }
  
  .card h2,
  .card h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
  }
  
  .form-group label {
    font-size: 0.75rem;
    margin-bottom: 0.25rem;
  }
  
  .form-group input,
  .form-group select,
  .form-group textarea {
    min-height: 36px;
    padding: 0.375rem 0.5rem;
    font-size: 0.875rem;
  }
  
  button,
  .btn {
    min-height: 36px;
    padding: 0.375rem 0.625rem;
    font-size: 0.813rem;
  }
  
  nav a {
    min-height: 36px;
    padding: 0.375rem;
    font-size: 0.75rem;
  }
  
  .item,
  .vendor-item,
  .storage-item,
  .restock-item {
    padding: 0.5rem;
    gap: 0.375rem;
  }
  
  .item-info,
  .item-meta {
    font-size: 0.75rem;
  }
  
  .item-name {
    font-size: 0.875rem;
  }
  
  .item small {
    font-size: 0.688rem;
  }
}

@media (min-width: 640px) {
  body {
    padding: var(--space-lg);
  }
  
  header h1 {
    font-size: var(--font-size-3xl);
  }

  header h1 .logo {
    height: 200px;
  }
  
  nav {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Login page specific styles */
body:not(:has(.nav-menu)) .nav-toggle {
  display: none;
}

@media (min-width: 640px) {
  body:has(.card) header {
    padding: var(--space-xs) var(--space-md);
    margin-left: calc(-1 * var(--space-lg));
    margin-right: calc(-1 * var(--space-lg));
    margin-bottom: var(--space-md);
    width: calc(100% + 2 * var(--space-lg));
    border-radius: 0;
  }
  
  body:has(.card) header h1 .logo {
    height: 200px;
  }
}

@media (min-width: 768px) {
  :root {
    --font-size-base: 1.0625rem;  /* 17px */
    --font-size-lg: 1.1875rem;    /* 19px */
  }
  
  .form-inline {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .card {
    padding: var(--space-xl);
  }
}

@media (min-width: 1024px) {
  body {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-xl);
  }
  
  header {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-lg);
  }
  
  .header-top {
    margin-bottom: 0;
  }
  
  header h1 {
    margin-bottom: 0;
  }
  
  /* Hide hamburger on desktop */
  .nav-toggle {
    display: none;
  }
  
  /* Always show nav on desktop */
  .nav-menu {
    display: grid;
    flex: 1;
    margin-bottom: 0;
  }
  
  nav {
    flex: 1;
    margin-bottom: 0;
  }
}

/* === Utility Classes === */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-center {
  text-align: center;
}

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

.mb-lg {
  margin-bottom: var(--space-lg);
}