/* =========================================
   NUTRICERN - MINIMALIST LUXE DESIGN SYSTEM
   ========================================= */

/* CSS Variables - Design Tokens */
:root {
  /* Colors - Primary */
  --color-primary: #2D5F5D;
  --color-primary-light: #4A8886;
  --color-primary-dark: #1A3938;
  
  /* Colors - Neutrals */
  --color-background: #FAFAF8;
  --color-surface: #FFFFFF;
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #6B6B6B;
  --color-text-tertiary: #A0A0A0;
  
  /* Colors - Accents */
  --color-accent: #C8A882;
  --color-success: #4A8886;
  --color-error: #C85858;
  --color-warning: #D4A574;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-focus: 0 0 0 3px rgba(45, 95, 93, 0.15);
  
  /* Borders */
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-radius-lg: 16px;
  --border-color: rgba(0, 0, 0, 0.06);
  
  /* Typography */
  --font-heading: 'Newsreader', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.625vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.25rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.5rem + 2.5vw, 3.5rem);
  
  /* 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;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Container */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* =========================================
   RESET & BASE STYLES
   ========================================= */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  min-height: 100vh;
}

/* =========================================
   TYPOGRAPHY
   ========================================= */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

h1 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-6);
}

h2 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-5);
}

h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

/* =========================================
   LAYOUT
   ========================================= */

.container {
  width: 100%;
  max-width: var(--container-lg);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

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

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

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.content-wrapper {
  flex: 1;
  padding: var(--space-16) 0;
}

/* =========================================
   CARDS & SURFACES
   ========================================= */

.card {
  background: var(--color-surface);
  border-radius: var(--border-radius);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card-header {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.card-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  font-weight: 400;
  margin-bottom: 0;
}

.card-body {
  margin-bottom: var(--space-6);
}

.card-footer {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-color);
}

/* =========================================
   BUTTONS
   ========================================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  line-height: 1;
  text-align: center;
  border: none;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

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

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

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

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

.btn-accent:hover {
  background: #B69772;
  transform: translateY(-1px);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* =========================================
   FORMS
   ========================================= */

.form-group {
  margin-bottom: var(--space-6);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  letter-spacing: 0.01em;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-base);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
}

.form-input::placeholder {
  color: var(--color-text-tertiary);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-hint {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.form-error {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-error);
}

/* Checkbox & Radio Styling */
.form-checkbox,
.form-radio {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  cursor: pointer;
}

.form-checkbox input,
.form-radio input {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--color-primary);
}

.form-checkbox label,
.form-radio label {
  cursor: pointer;
  user-select: none;
}

/* =========================================
   BADGES & TAGS
   ========================================= */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.badge-success {
  background: rgba(74, 136, 134, 0.1);
  color: var(--color-success);
}

.badge-warning {
  background: rgba(212, 165, 116, 0.1);
  color: var(--color-warning);
}

.badge-error {
  background: rgba(200, 88, 88, 0.1);
  color: var(--color-error);
}

.badge-neutral {
  background: rgba(0, 0, 0, 0.05);
  color: var(--color-text-secondary);
}

/* =========================================
   ALERTS & NOTIFICATIONS
   ========================================= */

.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--border-radius-sm);
  margin-bottom: var(--space-4);
  border-left: 3px solid;
}

.alert-success {
  background: rgba(74, 136, 134, 0.08);
  border-color: var(--color-success);
  color: var(--color-success);
}

.alert-error {
  background: rgba(200, 88, 88, 0.08);
  border-color: var(--color-error);
  color: var(--color-error);
}

.alert-warning {
  background: rgba(212, 165, 116, 0.08);
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.alert-info {
  background: rgba(45, 95, 93, 0.08);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* =========================================
   LOADING STATES
   ========================================= */

.loading-spinner {
  display: inline-block;
  width: 24px;
  height: 24px;
  border: 3px solid var(--border-color);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.skeleton {
  background: linear-gradient(
    90deg,
    rgba(0, 0, 0, 0.04) 25%,
    rgba(0, 0, 0, 0.06) 50%,
    rgba(0, 0, 0, 0.04) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--border-radius-sm);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* =========================================
   UTILITY CLASSES
   ========================================= */

/* Spacing */
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

/* Text Alignment */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Text Colors */
.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-accent { color: var(--color-accent); }

/* Display */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.grid { display: grid; }

/* Flexbox */
.flex-center { 
  display: flex; 
  align-items: center; 
  justify-content: center; 
}
.flex-between { 
  display: flex; 
  align-items: center; 
  justify-content: space-between; 
}
.flex-col { flex-direction: column; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

/* =========================================
   RESPONSIVE DESIGN
   ========================================= */

@media (max-width: 768px) {
  :root {
    --text-2xl: 2rem;
    --text-xl: 1.5rem;
  }
  
  .container {
    padding: 0 var(--space-4);
  }
  
  .content-wrapper {
    padding: var(--space-8) 0;
  }
  
  .card {
    padding: var(--space-6);
  }
  
  .btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
  }
}

/* =========================================
   ANIMATIONS
   ========================================= */

.fade-in {
  animation: fadeIn var(--transition-base) ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-up {
  animation: slideUp var(--transition-slow) ease-out;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =========================================
   FOCUS STATES (Accessibility)
   ========================================= */

*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}