/* ==========================================================================
   CAD|SKILL — Unified Design System Tokens & Base Styles
   Typography: Hanken Grotesk
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Hanken+Grotesk:ital,wght@0,300..900;1,300..900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200&display=swap');

:root {
  /* --- Light Theme (Pure Monochrome High-Contrast) --- */
  --color-page: #FFFFFF;
  --color-card: #FFFFFF;
  --color-subtle: #F4F4F4;
  --color-text: #0A0A0A;
  --color-text-muted: #666666;
  --color-primary: #0A0A0A;
  --color-primary-hover: #262626;
  --color-primary-text: #FFFFFF;
  --color-sage: #525252;
  --color-pale-sage: #E5E5E5;
  --color-border: #E5E5E5;
  --color-input: #FFFFFF;
  --color-selected: #E5E5E5;
  --color-error: #DC2626;
  --color-error-bg: #FEE2E2;
  --color-success: #16A34A;
  --color-success-bg: #DCFCE7;
  
  --font-sans: 'Hanken Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius-sm: 0.125rem;
  --radius-md: 0.25rem;
  --radius-lg: 0.375rem;
  --radius-full: 9999px;
  
  --header-height: 4.5rem;
  --content-max-width: 1440px;
  --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-dropdown: 0 4px 20px -2px rgba(0, 0, 0, 0.12);
}

html.dark, [data-theme="dark"] {
  /* --- Dark Theme (Default — Deep Pitch Black Editorial Monochrome) --- */
  --color-page: #000000;
  --color-card: #121212;
  --color-subtle: #1A1A1A;
  --color-text: #FFFFFF;
  --color-text-muted: #A3A3A3;
  --color-primary: #FFFFFF;
  --color-primary-hover: #E5E5E5;
  --color-primary-text: #000000;
  --color-sage: #D4D4D4;
  --color-pale-sage: #262626;
  --color-border: #262626;
  --color-input: #121212;
  --color-selected: #262626;
  --color-error: #FFB4AB;
  --color-error-bg: #301010;
  --color-success: #E5E5E5;
  --color-success-bg: #202020;

  --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.5);
  --shadow-dropdown: 0 6px 24px -2px rgba(0, 0, 0, 0.75);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--color-page);
  color: var(--color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  transition: background-color 0.2s ease, color 0.2s ease;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

main {
  flex: 1 0 auto;
  padding-top: var(--header-height);
}

a {
  color: inherit;
  text-decoration: none;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.text-hero {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

.text-section-title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 600;
  line-height: 1.2;
}

.text-card-title {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.35;
}

.text-body-lg {
  font-size: 1.125rem;
  line-height: 1.6;
}

.text-body {
  font-size: 0.9375rem;
  line-height: 1.55;
}

.text-body-sm {
  font-size: 0.8125rem;
  line-height: 1.45;
}

.text-caption {
  font-size: 0.75rem;
  line-height: 1.35;
  letter-spacing: 0.02em;
}

/* Material Icons */
.material-symbols-outlined {
  font-family: 'Material Symbols Outlined';
  font-weight: normal;
  font-style: normal;
  font-size: 20px;
  line-height: 1;
  display: inline-block;
  text-transform: none;
  letter-spacing: normal;
  word-wrap: normal;
  white-space: nowrap;
  direction: ltr;
  vertical-align: middle;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

@media (max-width: 768px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

.surface-page { background-color: var(--color-page); }
.surface-card { background-color: var(--color-card); }
.surface-subtle { background-color: var(--color-subtle); }
.text-main { color: var(--color-text); }
.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.border-subtle { border-color: var(--color-border); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  height: 2.625rem;
  padding: 0 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
  text-decoration: none;
  white-space: nowrap;
}

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

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.btn-secondary {
  background-color: var(--color-subtle);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-card);
  border-color: var(--color-primary);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-outline:hover:not(:disabled) {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-sm {
  height: 2.125rem;
  padding: 0 0.875rem;
  font-size: 0.8125rem;
}

.btn-lg {
  height: 3rem;
  padding: 0 1.75rem;
  font-size: 1rem;
}

/* Cards */
.card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.card-hover:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-subtle);
}

/* Form Inputs */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 0.375rem;
}

.form-label .required {
  color: var(--color-error);
  margin-left: 0.25rem;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

.input, .select, .textarea {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text);
  background-color: var(--color-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.625rem 0.875rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.input:focus, .select:focus, .textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-pale-sage);
}

.input::placeholder, .textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.8;
}

.textarea {
  min-height: 6.5rem;
  resize: vertical;
}

/* Badge & Tag Pills */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
  background-color: var(--color-subtle);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.badge-primary {
  background-color: var(--color-pale-sage);
  color: var(--color-primary);
  border-color: transparent;
}

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

.badge-warning {
  background-color: #FEF3C7;
  color: #92400E;
  border-color: transparent;
}

.badge-error {
  background-color: var(--color-error-bg);
  color: var(--color-error);
  border-color: transparent;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 1.5rem;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.empty-state-icon {
  font-size: 3rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.empty-state-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.empty-state-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  max-width: 28rem;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 1.5rem;
}

/* Honeypot field (hidden from humans) */
.hp-field {
  display: none !important;
  visibility: hidden !important;
  position: absolute !important;
  left: -9999px !important;
}

/* CAD|SKILL Consistent Wordmark */
.brand-wordmark {
  font-family: var(--font-sans);
  font-size: 1.3125rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  display: inline-flex;
  align-items: center;
  user-select: none;
  text-decoration: none;
  color: var(--color-text);
  line-height: 1;
}

.brand-wordmark .cad-part {
  color: var(--color-text);
  font-weight: 700;
}

.brand-wordmark .divider-part {
  color: var(--color-text-muted);
  margin: 0 0.15rem;
  font-weight: 300;
  opacity: 0.6;
}

.brand-wordmark .skill-part {
  color: var(--color-text);
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* Popular Search Chips */
.badge-chip {
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid var(--color-border);
  background-color: var(--color-subtle);
  color: var(--color-text);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
  line-height: 1.25;
}

.badge-chip:hover,
.badge-chip:focus-visible {
  background-color: var(--color-primary);
  color: var(--color-primary-text);
  border-color: var(--color-primary);
  outline: none;
}

/* Hero Search Field Focus State */
.search-field {
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.search-field:focus-within {
  border-color: var(--color-primary) !important;
  box-shadow: 0 0 0 1px var(--color-primary);
}

/* Monochrome Architectural Graphic Filter */
.hero-illustration img, img[src*="hero-drafting"] {
  filter: grayscale(100%) contrast(105%);
}