:root {
  /* Color Palette */
  --color-primary: #0052CC;
  --color-primary-hover: #003E99;
  --color-accent: #FF7A00;
  --color-accent-hover: #E66E00;
  --color-neutral-1: #F4F6F8;
  --color-neutral-2: #DEEBFF;
  --color-neutral-3: #6C757D;
  --color-neutral-4: #343A40;
  --color-white: #FFFFFF;
  --color-border: #CED4DA;
  --color-success: #28A745;
  --color-danger: #DC3545;

  /* Typography */
  --font-family-base: 'Inter', system-ui, -apple-system, sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  --line-height-base: 1.5;
  --line-height-heading: 1.2;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;

  /* Layout */
  --container-max-width: 1200px;
  --header-height: 70px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: var(--font-family-base);
  line-height: var(--line-height-base);
  color: var(--color-neutral-4);
  background-color: var(--color-neutral-1);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul {
  list-style: none;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-heading);
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.75rem;
}

h4 {
  font-size: 1.5rem;
}

h5 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-md);
}

/* Layout Containers */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header & Navigation */
.main-header {
  background-color: var(--color-white);
  padding: var(--spacing-xxl) 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-white) 0%, var(--color-neutral-1) 100%);
}

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

.main-logo {
  height: 140px;
  width: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transition: transform 0.3s ease;
  border: 4px solid var(--color-white);
}

.main-logo:hover {
  transform: scale(1.02);
}

.header-text {
  flex: 1;
}

.brand-title {
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
  font-size: 3rem;
  letter-spacing: -1px;
}

.brand-subtitle {
  color: var(--color-neutral-3);
  font-size: 1.25rem;
  font-weight: var(--font-weight-medium);
  max-width: 800px;
}

.hero-actions {
  margin-top: var(--spacing-lg);
}

.btn-hero-cta {
  padding: 14px 32px;
  font-size: 1.1rem;
  font-weight: var(--font-weight-bold);
  border-radius: 50px;
  box-shadow: var(--shadow-md);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.main-nav {
  background-color: var(--color-primary);
  padding: var(--spacing-sm) 0;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-list {
  display: flex;
  gap: var(--spacing-sm);
  overflow-x: auto;
  padding-bottom: 2px;
  /* For scrollbar if needed */
}

.nav-item {
  white-space: nowrap;
}

.nav-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.nav-link:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
  text-decoration: none;
}

.nav-link.active {
  background-color: var(--color-white);
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
  box-shadow: var(--shadow-sm);
}

/* Content Sections */
.tab-content {
  display: none;
  padding: var(--spacing-lg) 0;
  animation: fadeIn 0.3s ease-in-out;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Components */
.btn-primary {
  display: inline-block;
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-bold);
  border: none;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-block;
  background-color: transparent;
  color: var(--color-primary);
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  border: 1px solid var(--color-primary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background-color: var(--color-neutral-2);
  text-decoration: none;
}

.btn-nav-auth {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--color-white);
  color: var(--color-primary);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-bold);
  border: 1px solid var(--color-white);
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.9rem;
}

.btn-nav-auth:hover {
  background-color: var(--color-neutral-1);
  transform: translateY(-1px);
}

/* Cards & Panels */
.panel {
  background: var(--color-white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.panel-gray {
  background: var(--color-neutral-1);
}

.flex-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.flex-col-2 {
  flex: 2;
  min-width: 300px;
}

.flex-col-3 {
  flex: 3;
  min-width: 400px;
}

.flex-col-1 {
  flex: 1;
  min-width: 300px;
}

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

label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-neutral-4);
}

input[type="text"],
input[type="email"],
input[type="file"],
select,
textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-base);
  font-size: 1rem;
  transition: border-color 0.2s ease;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-neutral-2);
}

/* Showroom List */
.showroom-list {
  padding: 0;
}

.showroom-item {
  background: var(--color-white);
  padding: var(--spacing-md);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid var(--color-border);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.showroom-item:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
  border-color: var(--color-primary);
}

.action-link {
  margin-left: var(--spacing-sm);
  font-size: 0.9rem;
  font-weight: var(--font-weight-medium);
}

.action-link.delete {
  color: var(--color-danger);
}

/* 3D Viewer Placeholder */
.viewer-placeholder {
  width: 100%;
  height: 400px;
  background: #E9ECEF;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.viewer-overlay {
  position: absolute;
  bottom: var(--spacing-md);
  left: var(--spacing-md);
  background: rgba(0, 0, 0, 0.7);
  color: var(--color-white);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}

/* Emerging Apps Grid */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.app-card {
  background: var(--color-white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.app-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.app-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  background: var(--color-neutral-1);
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.app-card h5 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-neutral-4);
}

.app-card p {
  color: var(--color-neutral-3);
  font-size: 0.95rem;
  flex-grow: 1;
}

/* Footer */
.main-footer {
  text-align: center;
  padding: var(--spacing-xl) 0;
  color: var(--color-neutral-3);
  font-size: 0.9rem;
  border-top: 1px solid var(--color-border);
  margin-top: var(--spacing-xxl);
  background: var(--color-white);
}

/* Utilities */
.text-center {
  text-align: center;
}

.mt-1 {
  margin-top: var(--spacing-sm);
}

.mt-2 {
  margin-top: var(--spacing-md);
}

.mb-1 {
  margin-bottom: var(--spacing-sm);
}

.mb-2 {
  margin-bottom: var(--spacing-md);
}

.w-100 {
  width: 100%;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: #333;
  color: #fff;
  padding: 12px 24px;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast.success {
  background-color: var(--color-success);
}

.toast.error {
  background-color: var(--color-danger);
}

.toast.info {
  background-color: var(--color-primary);
}

/* Modal Styles */
.modal {
  display: none;
  /* Hidden by default */
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.5);
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease-out;
}

.modal-content {
  background-color: var(--color-white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
  position: relative;
  animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }

  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.close-modal {
  position: absolute;
  top: 10px;
  right: 15px;
  font-size: 28px;
  font-weight: bold;
  color: var(--color-neutral-3);
  cursor: pointer;
}

.close-modal:hover {
  color: var(--color-neutral-4);
}

/* Auth Tabs */
.auth-tabs {
  display: flex;
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.auth-tab {
  flex: 1;
  padding: 10px;
  background: none;
  border: none;
  font-weight: var(--font-weight-medium);
  color: var(--color-neutral-3);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.auth-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: var(--font-weight-bold);
}

.auth-form {
  display: none;
}

.auth-form.active {
  display: block;
}

.text-muted {
  color: var(--color-neutral-3);
  font-size: 0.9em;
}

/* Responsive Branding */
@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
    padding: 2rem 0;
  }

  .main-logo {
    height: 90px !important;
    width: 90px !important;
    max-width: 90px !important;
    max-height: 90px !important;
    object-fit: contain !important;
    margin: 0 auto;
    display: block;
  }

  .header-container {
    padding: 1rem 0;
  }

  .hero-actions {
    margin-top: 1.5rem;
  }

  .btn-hero-cta {
    width: 100%;
    max-width: 300px;
    padding: 16px 24px;
    font-size: 1.1rem;
  }

  .brand-title {
    font-size: 1.8rem;
    line-height: 1.1;
  }

  .brand-subtitle {
    font-size: 0.95rem;
    margin: 0.5rem auto 0;
    max-width: 90%;
    opacity: 0.9;
  }

  .nav-logo-icon {
    display: none;
    /* Hide icon on mobile to save space for menu items */
  }
}

/* Extra Small Devices */
@media (max-width: 480px) {
  .brand-title {
    font-size: 1.55rem;
  }

  .main-logo {
    height: 80px;
    width: 80px;
  }
}