/* ========================================
   CSS Variables & Base Styles
   ======================================== */

:root {
  /* Gradient colors - Tech style */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-success: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  --gradient-error: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  --gradient-warning: linear-gradient(135deg, #ffd89b 0%, #19547b 100%);

  /* Glow colors */
  --glow-primary: rgba(102, 126, 234, 0.6);
  --glow-accent: rgba(79, 172, 254, 0.6);
  --glow-success: rgba(67, 233, 123, 0.6);
  --glow-error: rgba(250, 112, 154, 0.6);

  /* Background colors */
  --bg-primary: #0a0e27;
  --bg-secondary: #151932;
  --bg-card: rgba(26, 31, 58, 0.8);
  --bg-card-hover: rgba(31, 37, 71, 0.9);

  /* Text colors */
  --text-primary: #e5e7eb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  /* Border colors */
  --border-default: rgba(255, 255, 255, 0.1);
  --border-focus: rgba(102, 126, 234, 0.5);
  --border-glow: rgba(102, 126, 234, 0.3);

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 24px;

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--glow-primary);

  color-scheme: dark;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

* {
  box-sizing: border-box;
}

/* ========================================
   Dynamic Gradient Background
   ======================================== */

body {
  margin: 0;
  background: var(--bg-primary);
  color: var(--text-primary);
  position: relative;
  overflow-x: hidden;
  min-height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(79, 172, 254, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 40% 20%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
  animation: gradientShift 20s ease infinite;
  z-index: -1;
  pointer-events: none;
}

@keyframes gradientShift {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-5%, -5%); }
}

/* ========================================
   Layout & Structure
   ======================================== */

main {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg) 48px;
  position: relative;
  z-index: 1;
  animation: fadeInUp 0.6s ease;
}

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

/* ========================================
   Navigation
   ======================================== */

nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
  margin-bottom: 20px;
  padding: var(--spacing-md);
  background: rgba(26, 31, 58, 0.6);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  animation: fadeInUp 0.6s ease 0.1s both;
}

nav a {
  color: var(--text-primary);
  text-decoration: none;
  position: relative;
  padding: var(--spacing-xs) 0;
  transition: color var(--transition-fast);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  transition: width var(--transition-normal);
}

nav a:hover {
  color: #4facfe;
}

nav a:hover::after {
  width: 100%;
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3 {
  margin: 0 0 var(--spacing-md);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.6s ease 0.2s both;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

.muted {
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* ========================================
   Cards
   ======================================== */

.card {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  animation: fadeInUp 0.6s ease 0.3s both;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(102, 126, 234, 0.2);
  transform: translateY(-2px);
}

/* ========================================
   Forms & Inputs
   ======================================== */

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--text-primary);
}

input,
textarea,
select {
  width: 100%;
  margin-top: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 10px var(--spacing-md);
  background: rgba(17, 24, 39, 0.8);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  transition: all var(--transition-normal);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2), 0 0 20px rgba(102, 126, 234, 0.3);
  background: rgba(17, 24, 39, 0.95);
}

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

/* Drag & drop file */
.drop-zone {
  border: 2px dashed var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--spacing-lg);
  text-align: center;
  background: rgba(17, 24, 39, 0.6);
  cursor: pointer;
  transition: all var(--transition-normal);
  user-select: none;
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15), 0 0 16px rgba(102, 126, 234, 0.2);
  background: rgba(17, 24, 39, 0.9);
}

.drop-zone:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.drop-zone-file {
  margin-top: var(--spacing-xs);
  font-size: 0.9rem;
  word-break: break-all;
}

/* ========================================
   Buttons
   ======================================== */

button {
  width: 100%;
  margin-top: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px var(--spacing-lg);
  background: var(--gradient-primary);
  color: white;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm), 0 0 20px rgba(102, 126, 234, 0.3);
}

button::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, transparent 100%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md), 0 0 30px var(--glow-primary);
}

button:hover::before {
  opacity: 1;
}

button:active {
  transform: translateY(0) scale(0.98);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: var(--shadow-sm);
}

button.secondary {
  background: rgba(55, 65, 81, 0.8);
  box-shadow: var(--shadow-sm);
}

button.secondary:hover {
  background: rgba(75, 85, 99, 0.9);
  box-shadow: var(--shadow-md);
}

button.inline {
  width: auto;
  margin: 0;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.9rem;
}

/* Button loading state */
.button-loading {
  pointer-events: none;
}

.button-spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  margin-right: var(--spacing-sm);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ========================================
   Grid & Layout
   ======================================== */

.row {
  display: grid;
  gap: var(--spacing-md);
}

@media (min-width: 800px) {
  .row.two {
    grid-template-columns: 1fr 1fr;
  }
}

.actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* ========================================
   Tables
   ======================================== */

.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  text-align: left;
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-default);
  vertical-align: top;
}

th {
  font-weight: 600;
  color: var(--text-primary);
  background: rgba(17, 24, 39, 0.5);
  position: relative;
}

th.sortable {
  cursor: pointer;
  user-select: none;
  padding-right: 30px;
  transition: color var(--transition-fast);
}

th.sortable:hover {
  color: #4facfe;
}

th.sortable::after {
  content: '⇅';
  position: absolute;
  right: 10px;
  opacity: 0.3;
  transition: opacity var(--transition-fast);
}

th.sortable:hover::after {
  opacity: 0.7;
}

th.sort-asc::after {
  content: '↑';
  opacity: 1;
  color: #4facfe;
}

th.sort-desc::after {
  content: '↓';
  opacity: 1;
  color: #4facfe;
}

tr {
  transition: background var(--transition-fast);
}

tbody tr:hover {
  background: rgba(102, 126, 234, 0.05);
}

/* Table search */
.table-search {
  margin-bottom: var(--spacing-md);
}

.search-input {
  max-width: 400px;
  margin-bottom: 0;
}

/* Table pagination */
.table-pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  background: rgba(26, 31, 58, 0.5);
  border-radius: var(--radius-sm);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.page-info {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ========================================
   Code & Pre
   ======================================== */

pre {
  background: rgba(11, 18, 32, 0.8);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: var(--spacing-md);
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  box-shadow: var(--shadow-sm);
}

code {
  background: rgba(17, 24, 39, 0.8);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 2px var(--spacing-sm);
  font-family: 'Courier New', monospace;
  font-size: 0.9em;
}

pre > code {
  background: transparent;
  border: 0;
  padding: 0;
  display: block;
}

/* Syntax highlighting */
.hl-keyword {
  color: #93c5fd;
  font-weight: 600;
}

.hl-string {
  color: #f9a8d4;
}

.hl-number {
  color: #fcd34d;
}

.hl-comment {
  color: #94a3b8;
  font-style: italic;
}

/* ========================================
   Images
   ======================================== */

img.preview {
  max-width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-default);
  box-shadow: var(--shadow-md);
}

/* ========================================
   QR Code
   ======================================== */

.qr-box {
  width: max-content;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: #ffffff;
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  max-width: 100%;
  overflow: auto;
  box-shadow: var(--shadow-md);
}

#otpQrContainer {
  line-height: 0;
}

#otpQrContainer canvas,
#otpQrContainer img {
  display: block;
}

/* ========================================
   Toast Notifications
   ======================================== */

#toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  max-width: 400px;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  color: var(--text-primary);
  pointer-events: auto;
  transform: translateX(400px);
  opacity: 0;
  transition: all var(--transition-normal);
}

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

.toast-hide {
  transform: translateX(400px);
  opacity: 0;
}

.toast-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.toast-message {
  flex: 1;
  font-size: 0.95rem;
}

.toast-close {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  padding: 0;
  margin: 0;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: color var(--transition-fast);
  box-shadow: none;
}

.toast-close:hover {
  color: var(--text-primary);
  transform: none;
  box-shadow: none;
}

.toast-success {
  border-left: 4px solid #43e97b;
}

.toast-success .toast-icon {
  color: #43e97b;
}

.toast-error {
  border-left: 4px solid #fa709a;
}

.toast-error .toast-icon {
  color: #fa709a;
}

.toast-info {
  border-left: 4px solid #4facfe;
}

.toast-info .toast-icon {
  color: #4facfe;
}

/* ========================================
   Global Loading Overlay
   ======================================== */

#global-loading {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(10, 14, 39, 0.8);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

#global-loading.loading-active {
  opacity: 1;
  pointer-events: auto;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.2);
  border-top-color: #4facfe;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 600px) {
  main {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  #toast-container {
    left: var(--spacing-md);
    right: var(--spacing-md);
    max-width: none;
  }

  .toast {
    transform: translateY(-100px);
  }

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

  .toast-hide {
    transform: translateY(-100px);
  }
}

/* ========================================
   Accessibility
   ======================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}