/* ============================================
   Design Kit — CSS Variables & Component Styles
   Mobile-first design system
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --color-white: #FFFFFD;
  --color-grey: #C3C2C7;
  --color-dark: #130F10;
  --color-dark-secondary: #252325;
  --color-accent: #F75139;
  --color-primary: #499592;

  /* Semantic colors */
  --color-bg: var(--color-white);
  --color-bg-alt: var(--color-grey);
  --color-text: var(--color-dark);
  --color-text-secondary: var(--color-dark-secondary);
  --color-text-muted: var(--color-grey);
  --color-text-inverse: var(--color-white);
  --color-border: var(--color-grey);
  --color-border-focus: var(--color-accent);
  --color-error: var(--color-accent);
  --color-success: var(--color-primary);

  /* Typography */
  --font-heading: 'Anton', sans-serif;
  --font-body: 'Roboto Flex', sans-serif;

  /* Font sizes */
  --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;
  --text-4xl: 2.5rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Border radius */
  --radius: 6px;

  /* Transitions */
  --transition: 0.2s ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(19, 15, 16, 0.08);
  --shadow-md: 0 4px 6px rgba(19, 15, 16, 0.1);
  --shadow-lg: 0 10px 15px rgba(19, 15, 16, 0.12);
}

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

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 400;
  line-height: 1.2;
  margin: 0 0 var(--space-md);
  color: var(--color-text);
}

h1, .h1 {
  font-size: var(--text-4xl);
  letter-spacing: 0.02em;
}

h2, .h2 {
  font-size: var(--text-3xl);
}

h3, .h3 {
  font-size: var(--text-2xl);
}

h4, .h4 {
  font-size: var(--text-xl);
}

p {
  margin: 0 0 var(--space-md);
  color: var(--color-text-secondary);
}

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

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

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 400;
  text-decoration: none;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color var(--transition), transform var(--transition), border-color var(--transition);
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Primary */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn-primary:hover:not(:disabled) {
  background-color: #3d7d7a;
}

.btn-primary:active:not(:disabled) {
  background-color: #356a68;
}

/* Secondary */
.btn-secondary {
  background-color: var(--color-grey);
  color: var(--color-text);
}

.btn-secondary:hover:not(:disabled) {
  background-color: #b0afb4;
}

.btn-secondary:active:not(:disabled) {
  background-color: #9d9ca1;
}

/* Outline */
.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover:not(:disabled) {
  background-color: rgba(73, 149, 146, 0.08);
}

.btn-outline:active:not(:disabled) {
  background-color: rgba(73, 149, 146, 0.15);
}

/* Accent outline */
.btn-outline-accent {
  background-color: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}

.btn-outline-accent:hover:not(:disabled) {
  background-color: rgba(247, 81, 57, 0.08);
}

/* Size variants */
.btn-sm {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
}

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

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

.btn-block {
  width: 100%;
}

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

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-md);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-white);
  border: 1px solid #252325;
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
  -webkit-appearance: none;
  appearance: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 2px rgba(247, 81, 57, 0.2);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--color-error);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  background-color: var(--color-grey);
  opacity: 0.7;
  cursor: not-allowed;
}

/* Select */
.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23252325' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-md) center;
  padding-right: 2.5rem;
}

.form-textarea {
  min-height: 100px;
  resize: vertical;
}

/* Checkbox */
.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  cursor: pointer;
}

.form-checkbox input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.form-checkbox .checkbox-box {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-radius: 4px;
  background-color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition), background-color var(--transition);
}

.form-checkbox input:checked + .checkbox-box {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.form-checkbox input:checked + .checkbox-box::after {
  content: '';
  display: block;
  width: 6px;
  height: 10px;
  border: solid var(--color-white);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-bottom: 3px;
}

.form-checkbox input:focus + .checkbox-box {
  box-shadow: 0 0 0 2px rgba(247, 81, 57, 0.2);
}

.form-checkbox input:checked:focus + .checkbox-box {
  box-shadow: 0 0 0 2px rgba(73, 149, 146, 0.3);
}

.form-error {
  font-size: var(--text-sm);
  color: var(--color-error);
  margin-top: var(--space-xs);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.form-error::before {
  content: '!';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  background-color: var(--color-error);
  color: var(--color-white);
  border-radius: 50%;
  font-size: 12px;
  font-weight: bold;
}

/* --- Cards --- */
.card {
  background-color: var(--color-white);
  border: 1px solid #252325;
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: box-shadow var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

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

.card-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  color: var(--color-accent);
  margin: 0;
}

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

.card-body:last-child {
  margin-bottom: 0;
}

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

.card-highlight {
  border-color: var(--color-primary);
  background: linear-gradient(to bottom, rgba(73, 149, 146, 0.04), transparent);
}

/* --- Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.badge-primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.badge-accent {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
}

.badge-neutral {
  background-color: var(--color-grey);
  color: var(--color-text);
}

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

.badge-outline-accent {
  background-color: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

/* --- Icons --- */
.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.icon-sm {
  width: 16px;
  height: 16px;
}

.icon-lg {
  width: 32px;
  height: 32px;
}

.icon svg {
  width: 100%;
  height: 100%;
  fill: currentColor;
}

/* --- Utility classes --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-xl) 0;
}

.section-title {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
}

.grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  :root {
    --text-4xl: 3rem;
  }

  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}