/**
 * Global Styles - Design Studio
 * 
 * Main site styles for the Design Studio landing page
 */

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

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
}

/* ============================================================================
 * BACKGROUND ATMOSPHERE
 * ============================================================================ */

.page-wrapper {
  min-height: 100vh;
  position: relative;
}

.page-wrapper::before {
  content: '';
  position: fixed;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(245, 158, 11, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(139, 92, 246, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

[data-theme="light"] .page-wrapper::before {
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(245, 158, 11, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-8) var(--spacing-6);
}

/* ============================================================================
 * HEADER
 * ============================================================================ */

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.logo__icon {
  width: 24px;
  height: 24px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo__icon svg {
  width: var(--icon-size-sm);
  height: var(--icon-size-sm);
  color: white;
}

.logo__text {
  font-family: var(--font-display);
  font-size: var(--font-size-16);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.025em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-in-out);
}

.theme-toggle:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
}

.theme-toggle svg {
  width: var(--icon-size-base);
  height: var(--icon-size-base);
  color: var(--color-text-2);
}

/* ============================================================================
 * HERO
 * ============================================================================ */

.hero {
  text-align: center;
  margin-bottom: var(--spacing-4);
}

.hero__badge {
  display: inline-block;
  padding: var(--spacing-1) var(--spacing-4);
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-6);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--font-size-24);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: var(--spacing-6);
  letter-spacing: -0.025em;
}

@media (max-width: 768px) {
  .hero__title {
    font-size: var(--font-size-20);
  }
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-2);
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ============================================================================
 * TABS NAVIGATION
 * ============================================================================ */

.tabs-wrapper {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-tab-outer);
  padding: var(--radius-tab-gap);
  margin-bottom: var(--spacing-8);
  box-shadow: var(--shadow-lg);
}

.tabs-nav {
  display: flex;
  gap: var(--spacing-2);
  flex-wrap: wrap;
}

.tab-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-5);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-tab-inner);
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-2);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-in-out);
}

.tab-link:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.tab-link--active {
  background: var(--color-surface-elevated);
  border-color: var(--color-border);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
}

.tab-link__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
}

.tab-link--active .tab-link__number {
  background: var(--color-primary);
  color: white;
}

/* ============================================================================
 * PROJECT CARDS GRID
 * ============================================================================ */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-6);
}

@media (max-width: 768px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-6);
  text-decoration: none;
  transition: all var(--duration-normal) var(--ease-in-out);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-normal) var(--ease-in-out);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.project-card:hover::before {
  transform: scaleX(1);
}

.project-card__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: rgba(245, 158, 11, 0.1);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-3);
}

.project-card__title {
  font-family: var(--font-display);
  font-size: var(--font-size-16);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-2);
  line-height: 1.3;
}

.project-card__description {
  font-size: var(--font-size-sm);
  color: var(--color-text-2);
  line-height: 1.6;
  margin-bottom: var(--spacing-4);
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.project-card__tag {
  padding: var(--spacing-1) var(--spacing-2);
  background: var(--color-surface-elevated);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-3);
}

.project-card__arrow {
  position: absolute;
  bottom: var(--spacing-4);
  right: var(--spacing-4);
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-elevated);
  border-radius: var(--radius-full);
  color: var(--color-text-2);
  transition: all var(--duration-fast) var(--ease-in-out);
}

.project-card:hover .project-card__arrow {
  background: var(--color-primary);
  color: white;
  transform: translateX(4px);
}

.project-card__arrow svg {
  width: var(--icon-size-sm);
  height: var(--icon-size-sm);
}

/* Placeholder card */
.project-card--placeholder {
  border-style: dashed;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  cursor: default;
}

.project-card--placeholder:hover {
  transform: none;
  box-shadow: none;
}

.project-card--placeholder::before {
  display: none;
}

.project-card--placeholder .placeholder-icon {
  width: var(--icon-size-xl);
  height: var(--icon-size-xl);
  color: var(--color-text-3);
  margin-bottom: var(--spacing-4);
}

.project-card--placeholder .placeholder-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-3);
}

/* ============================================================================
 * FOOTER
 * ============================================================================ */

.site-footer {
  text-align: center;
  padding: var(--spacing-12) 0;
  margin-top: var(--spacing-16);
  border-top: 1px solid var(--color-border-2);
}

.site-footer p {
  font-size: var(--font-size-sm);
  color: var(--color-text-3);
}

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

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero {
  animation: fadeInUp var(--duration-slow) var(--ease-out) forwards;
}

.tabs-wrapper {
  opacity: 0;
  animation: fadeInUp var(--duration-slow) var(--ease-out) 100ms forwards;
}

.project-card {
  opacity: 0;
  animation: fadeInUp var(--duration-normal) var(--ease-out) forwards;
}

.project-card:nth-child(1) { animation-delay: 200ms; }
.project-card:nth-child(2) { animation-delay: 300ms; }
.project-card:nth-child(3) { animation-delay: 400ms; }