/**
 * PROJECT AI LAB — Layout Architecture & Structural Grid
 * Fully Responsive, Modern CSS Grid & Flexbox, Native LTR / RTL Logical Properties
 */

/* ==========================================================================
   1. RESET & FOUNDATIONS
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  width: 100%;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--color-canvas);
  color: var(--color-text-body);
  font-family: var(--font-family-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Eliminate 300ms mobile touch delay */
button,
a,
input[type="button"],
input[type="submit"],
select,
.btn,
.metric-pill-btn,
.star-btn,
.model-tab,
.category-pill {
  touch-action: manipulation;
}

/* Content Protection & Anti-Scraping */
body:not(.admin-shell) {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

input,
textarea,
select,
[contenteditable="true"],
.selectable {
  -webkit-user-select: text !important;
  -moz-user-select: text !important;
  -ms-user-select: text !important;
  user-select: text !important;
}

img, svg, video {
  display: block;
  max-width: 100%;
  height: auto;
}

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

ul, ol {
  list-style: none;
}

/* ==========================================================================
   2. CONTAINERS & SPACING
   ========================================================================== */

.container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.container-wide {
  width: 100%;
  max-width: 1400px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.container-narrow {
  width: 100%;
  max-width: 860px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.container-fluid {
  width: 100%;
  padding-inline: 1.5rem;
}

.section {
  padding-block: 4rem;
}

.section-sm {
  padding-block: 2.5rem;
}

.section-lg {
  padding-block: 6rem;
}

/* ==========================================================================
   3. HEADER & PUBLIC NAVIGATION
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 251, 253, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--anim-base);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
  gap: 1.5rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text-main);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--anim-fast);
  position: relative;
  padding-block: 0.35rem;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-brand-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-brand-primary);
  border-radius: var(--radius-full);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

/* ==========================================================================
   4. HERO SECTION LAYOUT
   ========================================================================== */

.hero-wrapper {
  position: relative;
  overflow: hidden;
  padding-block: 5rem 3.5rem;
  background: radial-gradient(circle at 50% 0%, rgba(37, 99, 235, 0.06) 0%, rgba(124, 58, 237, 0.03) 40%, transparent 70%);
}

.hero-content {
  text-align: center;
  max-width: 820px;
  margin-inline: auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--color-brand-primary-light);
  color: var(--color-brand-primary);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-brand-primary-border);
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-xs);
}

.hero-title {
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  font-weight: 800;
  color: var(--color-text-main);
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 1.25rem;
}

.hero-title .text-gradient {
  background: linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-creative) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1rem, 1.75vw, 1.25rem);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: 2.25rem;
}

.hero-search {
  max-width: 640px;
  margin-inline: auto;
  position: relative;
  margin-bottom: 1.5rem;
}

.hero-tags {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   5. GRIDS & FEED LAYOUTS
   ========================================================================== */

.prompt-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
  gap: 1.75rem;
}

.category-bar {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  overflow-x: auto;
  padding-block: 0.5rem 1.5rem;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.category-bar::-webkit-scrollbar {
  display: none;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

/* Split layout: Sidebar + Feed */
.layout-split {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.layout-sidebar {
  position: sticky;
  top: 5.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* ==========================================================================
   6. ADMIN SHELL & SAAS DASHBOARD
   ========================================================================== */

.admin-shell {
  display: flex;
  min-height: 100vh;
  background-color: var(--color-canvas);
}

.admin-sidebar {
  width: 270px;
  flex-shrink: 0;
  background-color: var(--color-surface);
  border-inline-end: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 50;
  transition: transform var(--anim-base);
}

.admin-sidebar-header {
  height: 4.5rem;
  display: flex;
  align-items: center;
  padding-inline: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.admin-sidebar-nav {
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
}

.admin-nav-heading {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-subtle);
  padding: 0.75rem 0.75rem 0.35rem;
}

.admin-nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-body);
  transition: all var(--anim-fast);
}

.admin-nav-item:hover {
  background-color: var(--color-canvas-subtle);
  color: var(--color-brand-primary);
}

.admin-nav-item.active {
  background-color: var(--color-brand-primary-light);
  color: var(--color-brand-primary);
  font-weight: 600;
}

.admin-nav-item svg {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
}

.admin-nav-badge {
  margin-inline-start: auto;
  background-color: var(--color-brand-coral);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
}

.admin-sidebar-footer {
  margin-top: auto;
  border-top: 1px solid var(--color-border);
  padding: 1rem 1.125rem;
  background: var(--color-surface);
}

.admin-logout-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.08) 0%, rgba(220, 38, 38, 0.03) 100%);
  border: 1px solid rgba(239, 68, 68, 0.22);
  color: #EF4444;
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

.admin-logout-btn .logout-icon-wrap {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: rgba(239, 68, 68, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.22s ease;
}

.admin-logout-btn .logout-label {
  flex: 1;
  text-align: start;
}

.admin-logout-btn .logout-arrow-indicator {
  font-size: 0.875rem;
  opacity: 0.5;
  transition: all 0.22s ease;
}

.admin-logout-btn:hover {
  background: linear-gradient(135deg, #EF4444 0%, #DC2626 100%) !important;
  color: #FFFFFF !important;
  border-color: #EF4444 !important;
  box-shadow: 0 4px 18px rgba(239, 68, 68, 0.35);
  transform: translateY(-2px);
}

.admin-logout-btn:hover .logout-icon-wrap {
  background: rgba(255, 255, 255, 0.22) !important;
  color: #FFFFFF !important;
  transform: scale(1.08);
}

.admin-logout-btn:hover .logout-arrow-indicator {
  opacity: 1 !important;
  transform: translateX(4px);
}

[dir="rtl"] .admin-logout-btn:hover .logout-arrow-indicator {
  transform: translateX(-4px);
}

.admin-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.admin-topbar {
  height: 4.5rem;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: 2rem;
  position: sticky;
  top: 0;
  z-index: 40;
}

.admin-content {
  padding: 2rem;
  flex: 1;
}

.admin-grid-kpi {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

/* ==========================================================================
   7. FOOTER
   ========================================================================== */

.site-footer {
  margin-top: auto;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: 4rem 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-col h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 1.25rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: color var(--anim-fast);
}

.footer-link:hover {
  color: var(--color-brand-primary);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-bottom-left {
  flex: 1 1 auto;
}

.footer-bottom-center {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  justify-content: center;
}

.footer-bottom-right {
  flex: 1 1 auto;
  text-align: right;
}

[dir="rtl"] .footer-bottom-right {
  text-align: left;
}

.footer-policy-link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--anim-fast);
}

.footer-policy-link:hover {
  color: var(--color-brand-primary);
  text-decoration: underline;
}

.footer-dot-sep {
  opacity: 0.4;
  user-select: none;
}

.footer-host-link {
  color: var(--color-brand-creative);
  font-weight: 700;
  text-decoration: none;
  transition: opacity var(--anim-fast);
}

.footer-host-link:hover {
  text-decoration: underline;
  opacity: 0.85;
}

.footer-round-brand img {
  transition: transform var(--anim-normal), box-shadow var(--anim-normal);
}

.footer-round-brand:hover img {
  transform: scale(1.06);
  box-shadow: 0 0 32px rgba(37, 99, 235, 0.65);
}

.footer-tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.75rem;
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-canvas);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--anim-fast);
}

.footer-tag-pill:hover {
  color: var(--color-brand-creative);
  border-color: var(--color-brand-creative);
  background: rgba(37, 99, 235, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
}

/* ==========================================================================
   8. RESPONSIVE BREAKPOINTS (Desktop, Tablet & Mobile)
   ========================================================================== */

/* Tablet Optimization (769px to 1024px) */
@media (max-width: 1024px) {
  .container,
  .container-wide,
  .container-narrow {
    padding-inline: 1.5rem;
  }
  .section {
    padding-block: 3rem 3.5rem;
  }
  .hero-wrapper {
    padding-block: 3.5rem 2.5rem;
  }
  .hero-title {
    font-size: clamp(2rem, 4vw, 3rem);
  }
  .layout-split {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .layout-sidebar {
    position: static;
  }
  .nav-links {
    gap: 1.25rem;
  }
  .prompt-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
}

/* Mobile & Small Tablet Optimization (<= 768px) */
@media (max-width: 768px) {
  /* Prevent iOS Safari automatic zoom on form elements */
  input[type="text"],
  input[type="search"],
  input[type="password"],
  input[type="email"],
  select,
  textarea {
    font-size: 16px !important;
  }

  .container,
  .container-wide,
  .container-narrow {
    padding-inline: max(1rem, env(safe-area-inset-left, 0px));
    padding-inline-end: max(1rem, env(safe-area-inset-right, 0px));
  }
  .section {
    padding-block: 2rem 2.75rem;
  }
  .hero-wrapper {
    padding-block: 2.25rem 1.75rem;
  }
  .hero-badge {
    font-size: 0.75rem;
    padding: 0.3rem 0.75rem;
    margin-bottom: 1rem;
  }
  .hero-title {
    font-size: clamp(1.75rem, 5.5vw, 2.35rem);
    letter-spacing: -0.02em;
    margin-bottom: 0.85rem;
    line-height: 1.2;
  }
  .hero-subtitle {
    font-size: 0.95rem;
    line-height: 1.55;
    margin-bottom: 1.5rem;
    padding-inline: 0.25rem;
  }
  .hero-search {
    margin-bottom: 1.25rem;
  }
  .hero-search input {
    height: 3rem !important;
    font-size: 16px !important;
    padding-inline: 2.85rem 1rem !important;
  }

  /* Trending Tags: Smooth Swipeable Horizontal Strip on Mobile */
  .hero-tags {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding-bottom: 0.35rem;
    padding-inline: 0.25rem;
    gap: 0.4rem;
  }
  .hero-tags::-webkit-scrollbar {
    display: none;
  }
  .hero-tags > span {
    flex-shrink: 0;
    font-size: 0.8rem;
  }
  .hero-tags .tag-pill {
    flex-shrink: 0;
    white-space: nowrap;
  }

  .nav-links {
    display: none !important;
  }

  .admin-sidebar {
    position: fixed;
    transform: translateX(calc(-100% * var(--dir-factor)));
  }
  .admin-sidebar.open {
    transform: translateX(0);
  }
  .prompt-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .grid-2 {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 0.85rem;
    text-align: center;
    padding-top: 1.5rem;
    word-break: break-word;
  }
  .footer-bottom-left,
  .footer-bottom-center,
  .footer-bottom-right {
    text-align: center !important;
    width: 100%;
    justify-content: center;
    font-size: 0.8125rem;
    line-height: 1.55;
    word-break: break-word;
  }
  .admin-topbar {
    padding-inline: 1rem;
    height: 3.75rem;
  }
  .admin-content {
    padding: 1.25rem 1rem;
  }
}

/* Extra Small Phones (<= 480px) */
@media (max-width: 480px) {
  .container,
  .container-wide,
  .container-narrow {
    padding-inline: max(0.85rem, env(safe-area-inset-left, 0px));
    padding-inline-end: max(0.85rem, env(safe-area-inset-right, 0px));
  }
  .section {
    padding-block: 1.75rem 2.25rem;
  }
  .hero-wrapper {
    padding-block: 1.75rem 1.35rem;
  }
  .hero-title {
    font-size: clamp(1.55rem, 6vw, 2rem);
    letter-spacing: -0.015em;
  }
  .hero-subtitle {
    font-size: 0.88rem;
    margin-bottom: 1.25rem;
  }
  .hero-badge {
    font-size: 0.725rem;
    padding: 0.25rem 0.65rem;
    margin-bottom: 0.85rem;
  }
  .hero-search input {
    height: 2.85rem !important;
    padding-inline: 2.6rem 0.85rem !important;
  }
  .hero-tags .tag-pill {
    padding: 0.25rem 0.65rem;
    font-size: 0.75rem;
  }
}