/* ═══════════════════════════════════════════════════════════════
   DA ARCHITECH - ENHANCED MASTER DESIGN SYSTEM v2.0
   Professional AI Architecture Rendering Platform
   Refined typography, spacing, colors, and component system
   ═══════════════════════════════════════════════════════════════ */

/* Reset and Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors - Refined Palette */
  --color-white: #ffffff;
  --color-black: #000000;
  --color-dark: #0a0a0a;
  --color-gray-50: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-light: #f0f0f0;
  --color-gray-medium: #7a7a7a;
  --color-gray-dark: #2d2d2d;
  --color-accent: #d4af37;
  --color-accent-hover: #e6c547;
  --color-primary-blue: #3b82f6;
  --color-primary-blue-dark: #2563eb;
  --color-primary-blue-light: #60a5fa;

  /* Typography */
  --font-serif: 'Instrument Serif', serif;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

  /* Spacing Scale */
  --space-xs: 0.375rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 5rem;
  --space-5xl: 6rem;
  --space-6xl: 8rem;

  /* Line Heights */
  --line-height-tight: 1.1;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.8;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease;

  /* Border Radius */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.12);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.15);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-gray-dark);
  background: var(--color-white);
  line-height: var(--line-height-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography Scales - Enhanced */
h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
  margin: 0;
}

h2 {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0;
  margin-bottom: var(--space-md);
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0;
  margin-bottom: var(--space-sm);
}

h4 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
  margin: 0;
  margin-bottom: var(--space-sm);
}

h5 {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  margin: 0;
}

h6 {
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.4;
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-gray-medium);
}

p {
  font-size: 1rem;
  line-height: var(--line-height-relaxed);
  color: var(--color-gray-medium);
  margin: 0;
  margin-bottom: var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

small {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-gray-medium);
}

/* Links */
a {
  color: var(--color-primary-blue);
  text-decoration: none;
  transition: color var(--transition-normal);
  font-weight: 500;
}

a:hover {
  color: var(--color-primary-blue-dark);
  text-decoration: underline;
}

a:active {
  opacity: 0.8;
}

/* Buttons */
button,
.btn {
  font-family: inherit;
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

button:disabled,
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Button Variants */
.btn-primary {
  background: var(--color-primary-blue);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-blue-dark);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--color-gray-100);
  color: var(--color-gray-dark);
  border: 1.5px solid var(--color-gray-light);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-gray-light);
  border-color: var(--color-gray-medium);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.btn-accent {
  background: var(--color-accent);
  color: var(--color-dark);
  font-weight: 700;
}

.btn-accent:hover:not(:disabled) {
  background: var(--color-accent-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary-blue);
  border: 1.5px solid var(--color-primary-blue);
}

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

.btn-sm {
  padding: var(--space-xs) var(--space-md);
  font-size: 0.875rem;
  border-radius: var(--radius-xs);
}

.btn-lg {
  padding: var(--space-md) var(--space-2xl);
  font-size: 1.025rem;
  border-radius: var(--radius-md);
}

/* Navigation */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  box-shadow: var(--shadow-sm);
}

nav > div {
  max-width: 1600px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-dark);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  transition: color var(--transition-normal);
}

.logo:hover {
  color: var(--color-primary-blue);
}

.logo img {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-xs);
  object-fit: contain;
}

nav ul {
  display: flex;
  gap: var(--space-2xl);
  list-style: none;
}

nav a {
  color: var(--color-gray-medium);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition-normal);
  text-decoration: none;
}

nav a:hover,
nav a.active {
  color: var(--color-primary-blue);
}

.nav-cta {
  padding: 0.625rem 1.375rem;
  background: var(--color-dark);
  color: white;
  border-radius: var(--radius-xs);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: all var(--transition-normal);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-cta:hover {
  background: var(--color-gray-dark);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* Containers */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container-sm {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container-lg {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Sections */
section {
  padding: var(--space-5xl) var(--space-lg);
}

section.hero {
  padding: 0;
  margin-top: 70px;
}

section.light {
  background: var(--color-gray-50);
}

section.accent {
  background: var(--color-dark);
  color: white;
}

section.accent h1,
section.accent h2,
section.accent h3,
section.accent h4,
section.accent h5 {
  color: white;
}

section.accent p {
  color: rgba(255, 255, 255, 0.85);
}

/* Grid */
.grid {
  display: grid;
  gap: var(--space-2xl);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

/* Cards */
.card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0, 0, 0, 0.02);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(0, 0, 0, 0.05);
}

.card-image {
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-gray-100) 0%, var(--color-gray-light) 100%);
  position: relative;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform var(--transition-slow);
}

.card:hover .card-image img {
  transform: scale(1.05);
}

.card-content {
  padding: var(--space-lg);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-dark);
}

.card-text {
  font-size: 0.95rem;
  line-height: var(--line-height-relaxed);
  color: var(--color-gray-medium);
}

/* Form Elements */
input,
textarea,
select {
  font-family: inherit;
  font-size: 1rem;
  padding: var(--space-sm) var(--space-md);
  border: 1.5px solid var(--color-gray-light);
  border-radius: var(--radius-sm);
  transition: all var(--transition-normal);
  background: white;
  color: var(--color-gray-dark);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary-blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  font-size: 0.9rem;
  color: var(--color-gray-dark);
}

/* Badges */
.badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

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

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

.badge-light {
  background: var(--color-gray-100);
  color: var(--color-gray-dark);
}

/* Utility Classes */
.text-center {
  text-align: center;
}

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

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

.text-muted {
  color: var(--color-gray-medium);
  font-size: 0.9rem;
}

.text-small {
  font-size: 0.875rem;
}

.text-large {
  font-size: 1.125rem;
}

/* Spacing Utilities */
.mt-xs { margin-top: var(--space-xs); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-xs { margin-bottom: var(--space-xs); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.mx-auto { margin-left: auto; margin-right: auto; }

.px-lg { padding-left: var(--space-lg); padding-right: var(--space-lg); }
.py-lg { padding-top: var(--space-lg); padding-bottom: var(--space-lg); }
.py-xl { padding-top: var(--space-xl); padding-bottom: var(--space-xl); }

/* Dividers */
.divider {
  height: 1px;
  background: rgba(0, 0, 0, 0.05);
  margin: var(--space-lg) 0;
}

/* Opacity */
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

/* Display */
.hidden {
  display: none !important;
}

.block {
  display: block;
}

.inline {
  display: inline;
}

.inline-block {
  display: inline-block;
}

.flex {
  display: flex;
  gap: var(--space-md);
}

.flex-col {
  flex-direction: column;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Responsive */
@media (max-width: 1024px) {
  section {
    padding: var(--space-4xl) var(--space-lg);
  }

  .grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }

  .grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

@media (max-width: 768px) {
  nav {
    padding: var(--space-sm) var(--space-md);
  }

  nav ul {
    display: none;
  }

  nav > div {
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: var(--space-md);
  }

  section {
    padding: var(--space-3xl) var(--space-md);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
  }

  h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
  }

  .btn {
    width: 100%;
  }

  .card-content {
    padding: var(--space-md);
  }
}

@media (max-width: 480px) {
  section {
    padding: var(--space-2xl) var(--space-md);
  }

  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  h3 {
    font-size: 1.1rem;
  }

  nav {
    padding: var(--space-sm);
  }

  .logo {
    font-size: 0.75rem;
  }

  .logo img {
    width: 24px;
    height: 24px;
  }
}