/**
 * QRCodeForLife Complete Design System v2
 * Comprehensive CSS Remaster with all features
 * Color Palette: Lime (#d1ed46), Teal (#5ad6c1), Green (#6cc750),
 *               Dark Blue (#4d6470), Black (#010600), White (#fefdfb)
 */

/* =====================================================
   CSS VARIABLES & TOKENS
   ===================================================== */

:root {
  /* PRIMARY COLORS */
  --color-lime: #d1ed46;
  --color-teal: #5ad6c1;
  --color-green: #6cc750;
  --color-dark-blue: #4d6470;
  --color-black: #010600;
  --color-white: #fefdfb;

  /* SEMANTIC COLORS */
  --color-success: #6cc750;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #5ad6c1;
  --color-disabled: #d1d5db;

  /* BACKGROUNDS */
  --bg-primary: var(--color-white);
  --bg-secondary: #f5f5f4;
  --bg-tertiary: #ede9e1;
  --bg-dark: var(--color-dark-blue);

  /* TEXT COLORS */
  --text-primary: var(--color-black);
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --text-light: var(--color-white);
  --text-disabled: #9ca3af;

  /* BORDERS */
  --border-color: #e5e7eb;
  --border-light: #f3f4f6;
  --border-dark: #d1d5db;

  /* TYPOGRAPHY */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Courier New', monospace;

  /* SPACING (8px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;

  /* RADIUS */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* SHADOWS */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);

  /* TRANSITIONS */
  --transition: 200ms ease-in-out;
}

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

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
}

/* =====================================================
   TYPOGRAPHY
   ===================================================== */

h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 {
  font-size: 32px;
  margin-bottom: var(--space-4);
}

h2 {
  font-size: 24px;
  margin-bottom: var(--space-3);
}

h3 {
  font-size: 18px;
  margin-bottom: var(--space-2);
}

h4 {
  font-size: 14px;
  font-weight: 600;
}

p {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  display: block;
  margin-bottom: var(--space-2);
}

small, .text-sm {
  font-size: 12px;
  color: var(--text-tertiary);
}

code {
  font-family: var(--font-mono);
  background-color: var(--bg-tertiary);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 13px;
}

/* =====================================================
   BUTTONS (SOLID COLORS, NO GRADIENTS)
   ===================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: 14px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition);
  min-height: 44px;
  white-space: nowrap;
  user-select: none;
  font-family: var(--font-family);
}

/* PRIMARY BUTTON - Solid Lime */
.btn-primary {
  background-color: var(--color-lime);
  color: var(--color-black);
  border: 2px solid var(--color-lime);
}

.btn-primary:hover:not(:disabled) {
  background-color: #c7e333;
  border-color: #c7e333;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

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

/* SECONDARY BUTTON - Solid Teal */
.btn-secondary {
  background-color: var(--color-teal);
  color: var(--color-white);
  border: 2px solid var(--color-teal);
}

.btn-secondary:hover:not(:disabled) {
  background-color: #4ac4b1;
  border-color: #4ac4b1;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

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

/* SUCCESS BUTTON - Solid Green */
.btn-success {
  background-color: var(--color-success);
  color: var(--color-white);
  border: 2px solid var(--color-success);
}

.btn-success:hover:not(:disabled) {
  background-color: #5ab03e;
  border-color: #5ab03e;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* DANGER BUTTON - Solid Red */
.btn-danger {
  background-color: var(--color-error);
  color: var(--color-white);
  border: 2px solid var(--color-error);
}

.btn-danger:hover:not(:disabled) {
  background-color: #dc2626;
  border-color: #dc2626;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* DISABLED STATE */
.btn:disabled {
  background-color: var(--color-disabled);
  color: var(--text-disabled);
  border-color: var(--color-disabled);
  cursor: not-allowed;
  opacity: 0.6;
  transform: none;
}

/* SIZE VARIANTS */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: 12px;
  min-height: 36px;
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: 16px;
  min-height: 52px;
}

.btn-block {
  width: 100%;
}

/* TEXT LINK BUTTON */
a {
  color: var(--color-teal);
  text-decoration: none;
  transition: color var(--transition);
  cursor: pointer;
}

.header-info a {
  color: var(--color-black);
}

/* =====================================================
   FORM ELEMENTS
   ===================================================== */

.form-group {
  display: flex;
  flex-direction: column;
  margin-bottom: var(--space-6);
}

input[type="email"],
input[type="password"],
input[type="text"],
input[type="url"],
input[type="number"],
textarea,
select {
  font-family: var(--font-family);
  font-size: 14px;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: all var(--transition);
  min-height: 44px;
  width: 100%;
}

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

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-teal);
  box-shadow: 0 0 0 3px rgba(90, 214, 193, 0.1);
}

input:disabled,
textarea:disabled {
  background-color: var(--bg-tertiary);
  color: var(--text-disabled);
  cursor: not-allowed;
}

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

/* INPUT ERROR STATE */
input.error,
textarea.error {
  border-color: var(--color-error);
  background-color: rgba(239, 68, 68, 0.05);
}

input.error:focus,
textarea.error:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

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

header {
  background-color: var(--bg-primary);
  border-bottom: 2px solid var(--border-color);
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-6);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.header-brand img {
  height: 40px;
  width: auto;
}

.header-brand-text h1 {
  margin: 0;
  font-size: 24px;
  color: var(--color-lime);
}

.header-brand-text p {
  margin: 0;
  font-size: 12px;
  color: var(--text-secondary);
}

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

.tier-badge {
  padding: var(--space-2) var(--space-4);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.tier-badge.free {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.tier-badge.pro {
  background-color: var(--color-lime);
  color: var(--color-black);
  border: 2px solid var(--color-lime);
}

.header-link {
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  transition: color var(--transition);
}

.header-link:hover {
  color: var(--color-teal);
}

.header-logout {
  color: var(--color-error);
  font-weight: 600;
  transition: color var(--transition);
}

.header-logout:hover {
  color: #dc2626;
}

/* DASHBOARD HEADER */
.dashboard-header {
  background-color: var(--bg-primary);
  border-bottom: 2px solid var(--border-light);
  padding: var(--space-4) var(--space-6);
  box-shadow: var(--shadow-sm);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-6);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header-brand img {
  height: 40px;
  width: auto;
}

.header-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.header-info h1 {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary); 
  text-decoration: none;
}

.header-info p {
  margin: 0;
  font-size: 12px;
  color: var(--text-secondary);
}

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

.header-action-link {
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 500;
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--transition);
}

.header-action-link:hover {
  color: var(--color-teal);
}

/* LOGIN PAGE
   ===================================================== */

.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-teal) 0%, var(--color-black) 100%);
  padding: var(--space-4);
}

.login-card {
  background-color: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  max-width: 400px;
  width: 100%;
  box-shadow: var(--shadow-lg);
}

.login-card h1 {
  text-align: center;
  margin-bottom: var(--space-2);
  color: var(--color-lime);
}

.login-card p {
  text-align: center;
  margin-bottom: var(--space-6);
}

.login-features {
  list-style: none;
  margin-bottom: var(--space-6);
}

.login-features li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  font-size: 13px;
  color: var(--text-secondary);
}

.login-features span:first-child {
  color: var(--color-success);
  font-weight: 600;
}

/* =====================================================
   DASHBOARD MAIN CONTENT
   ===================================================== */

.dashboard-container {
  min-height: 100vh;
  background-color: var(--bg-secondary);
  display: flex;
  flex-direction: column;
}

.dashboard-content {
  padding: 10px;
  max-width: 1400px;
  flex: 1;
  margin: 0 auto;
  width: 100%;
}

.dashboard-container__login .dashboard-content {
  max-width: 100%;
  padding: 0;
}

.dashboard-actions {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
  justify-content: center;
}

/* CREATE FORM */
.create-form {
  background-color: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
  box-shadow: var(--shadow-sm);
  border: 2px solid var(--border-light);
}

.create-form h2 {
  margin-bottom: var(--space-4);
  color: var(--color-lime);
}

.create-form-fields {
  display: grid;
  gap: var(--space-4);
}

.create-form-help {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: var(--space-1);
}

.create-form-buttons {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.form-error {
  color: var(--color-error);
  font-size: 13px;
  margin-top: var(--space-2);
}

/* FORM SECTION (Alternative naming for create form) */
.create-form-section {
  background-color: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
  box-shadow: var(--shadow-sm);
  border: 2px solid var(--border-light);
}

.create-form-section h2 {
  margin-bottom: var(--space-4);
  color: var(--color-lime);
  font-size: 18px;
  font-weight: 600;
}

.form-section {
  display: grid;
  gap: var(--space-4);
}

.form-section > div {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-section label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.form-section input {
  font-size: 14px;
  padding: var(--space-2) var(--space-3);
}

.form-help-text {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: var(--space-1);
}

.form-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

/* TEXT UTILITIES */
.text-error {
  color: var(--color-error);
  font-size: 13px;
}

.text-help {
  font-size: 12px;
  color: var(--text-tertiary);
}

.text-muted {
  color: var(--text-tertiary);
}

/* =====================================================
   QR CODE CARDS GRID
   ===================================================== */

.qr-grid {
  display: flex;
  flex-direction: row;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
  justify-content: center;
}

.qr-card {
  width: 350px;
  background-color: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  border: 2px solid var(--border-dark);
  transition: all var(--transition);
}

.qr-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-teal);
  transform: translateY(-4px);
}

/* DISABLED QR CARD (Frozen - was Pro, now Free) */
.qr-card.disabled {
  opacity: 0.7;
  background-color: var(--bg-tertiary);
  border-color: var(--border-dark);
}

.qr-card.disabled::after {
  content: 'FROZEN';
  display: block;
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  background-color: var(--color-warning);
  color: var(--color-white);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 600;
}

.qr-preview {
  background-color: var(--bg-secondary);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
}

.qr-preview img,
.qr-preview canvas {
  max-width: 150px;
  max-height: 150px;
}

.qr-info {
  margin-bottom: var(--space-4);
}

.qr-info-item {
  margin-bottom: var(--space-3);
}

.qr-info-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.qr-destination {
  display: flex;
  margin-bottom: var(--space-3);
}

.qr-destination input {
  font-size: 12px;
  padding: var(--space-2) var(--space-3);
}

.qr-stats {
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--color-lime);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

.qr-stats-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-1);
}

.qr-stats-number {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-lime);
}

.qr-date {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: var(--space-1);
}

.qr-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}

.qr-actions .btn {
  min-height: 40px;
  font-size: 13px;
  padding: var(--space-2) var(--space-3);
}

/* =====================================================
   EMPTY STATE
   ===================================================== */

.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-6);
}

.empty-state p {
  color: var(--text-secondary);
  font-size: 16px;
}

/* =====================================================
   MODALS
   ===================================================== */

.modal-backdrop {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(1, 6, 0, 0.5);
  z-index: 1040;
}

.modal-backdrop.active {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.modal {
  background-color: var(--bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  max-width: 500px;
  width: 100%;
  animation: slideUp 300ms ease-out;
  overflow-y: auto;
  max-height: 90vh;
  z-index: 1050;
}

/* MODAL OVERLAY & CONTENT (Alternative naming) */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(1, 6, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  z-index: 1040;
}

.modal-content {
  background-color: var(--bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  max-width: 500px;
  width: 100%;
  padding: var(--space-6);
  animation: slideUp 300ms ease-out;
  overflow-y: auto;
  max-height: 90vh;
  z-index: 1050;
}

.modal-content.modal-large {
  max-width: 900px;
}

.modal-content h2 {
  margin: 0 0 var(--space-4) 0;
  font-size: 20px;
  font-weight: 600;
  color: var(--color-lime);
}

.modal-content h3 {
  margin: 0 0 var(--space-3) 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-content p {
  margin: 0 0 var(--space-2) 0;
  font-size: 14px;
  color: var(--text-secondary);
  display:flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

.modal-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-6);
  justify-content: flex-end;
}

.modal-actions .btn {
  flex: 1;
}

/* UPGRADE MODAL */
.upgrade-modal-content {
  text-align: center;
}

.upgrade-description {
  margin: var(--space-4) 0 var(--space-6) 0;
  color: var(--text-secondary);
}

.upgrade-plan-box {
  background-color: #e0f7ff;
  border: 2px solid var(--color-teal);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin: var(--space-4) 0;
}

.upgrade-plan-text {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
}

.upgrade-price {
  margin: var(--space-2) 0 0 0;
  font-size: 32px;
  font-weight: 700;
  color: var(--color-lime);
}

.upgrade-features {
  text-align: left;
  margin: var(--space-4) 0;
  display: grid;
  gap: var(--space-2);
}

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 13px;
  color: var(--text-secondary);
}

.feature-check {
  color: var(--color-success);
  font-weight: 600;
  font-size: 16px;
}

/* ANALYTICS MODAL */
.analytics-main {
  margin: var(--space-4) 0;
}

.analytics-total {
  font-size: 16px;
  margin: 0;
  color: var(--text-primary);
}

.analytics-count {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-lime);
}

.analytics-section {
  margin: var(--space-6) 0;
  padding: var(--space-4);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.analytics-section h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 var(--space-4) 0;
  color: var(--text-primary);
}

.analytics-section canvas {
  max-width: 100%;
  height: auto;
}

.analytics-upgrade-prompt {
  background: linear-gradient(135deg, rgba(90, 214, 193, 0.1), rgba(209, 237, 70, 0.1));
  border: 2px solid var(--color-teal);
  padding: var(--space-6);
  text-align: center;
}

.analytics-upgrade-prompt p {
  margin: 0;
  font-size: 16px;
  color: var(--text-primary);
}

.analytics-clicks-list {
  display: grid;
  gap: var(--space-2);
}

.analytics-click-item {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  font-size: 12px;
}

.click-time {
  font-family: var(--font-mono);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.click-referer {
  color: var(--text-secondary);
  font-size: 11px;
}

.modal-header {
  padding: var(--space-6);
  border-bottom: 2px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.modal-header h2 {
  margin: 0;
  flex: 1;
  color: var(--color-lime);
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-tertiary);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition);
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: var(--space-6);
}

.modal-footer {
  padding: var(--space-6);
  border-top: 2px solid var(--border-color);
  display: flex;
  gap: var(--space-2);
  justify-content: flex-end;
}

.modal-footer .btn {
  flex: 1;
}

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

footer {
  background-color: var(--color-dark-blue);
  color: var(--text-light);
  padding: var(--space-8) var(--space-6);
  margin-top: auto;
  text-align: center;
  border-top: 3px solid var(--color-lime);
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
}

.footer-text {
  font-size: 14px;
  margin-bottom: var(--space-2);
}

.footer-link {
  color: var(--color-lime);
  text-decoration: none;
  transition: color var(--transition);
}

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

.footer-copyright {
  font-size: 12px;
  color: rgba(254, 253, 251, 0.7);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(254, 253, 251, 0.2);
}

.dashboard-footer {
  background-color: var(--color-primary);
  color: var(--text-light);
  padding: var(--space-6);
  margin-top: auto;
  text-align: center;
  border-top: 3px solid var(--color-lime);
}

.dashboard-footer p {
  margin: 0;
  font-size: 13px;
}

.dashboard-footer a {
  color: var(--color-teal);
  text-decoration: none;
  transition: color var(--transition);
}

.dashboard-footer a:hover {
  color: var(--color-teal);
  text-decoration: underline;
}

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

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.fade-in {
  animation: fadeIn 300ms ease-out;
}

/* =====================================================
   UTILITY CLASSES
   ===================================================== */

.hidden {
  display: none !important;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.flex {
  display: flex;
}

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

.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }

.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }

.text-center { text-align: center; }
.text-sm { font-size: 13px; }

.text-error { color: var(--color-error); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* =====================================================
   RESPONSIVE DESIGN
   ===================================================== */

@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    gap: var(--space-2);
  }

  .header-content {
    justify-content: center;
  }

  .header-brand {
    display: none;
  }

  .header-brand-text h1 {
    font-size: 18px;
  }

  .qr-grid {
    grid-template-columns: 1fr;
  }

  .qr-actions {
    grid-template-columns: 1fr;
  }

  .dashboard-actions {
    flex-direction: column;
  }

  .dashboard-actions .btn {
    width: 100%;
  }

  .modal {
    max-width: 90vw;
  }

  h1 { font-size: 24px; }
  h2 { font-size: 18px; }
}

@media (max-width: 480px) {
  :root {
    font-size: 14px;
  }

  .btn {
    padding: var(--space-2) var(--space-4);
    min-height: 40px;
    font-size: 13px;
  }

  .login-card {
    padding: var(--space-4);
  }

  .create-form {
    padding: var(--space-4);
  }

  .qr-card {
    padding: var(--space-4);
  }

  .modal-footer .btn {
    width: 100%;
  }

  .modal-footer {
    flex-direction: column;
  }

  h1 { font-size: 20px; }
  h2 { font-size: 16px; }
}

/* =====================================================
   ACCESSIBILITY
   ===================================================== */

*:focus-visible {
  outline: 3px solid var(--color-teal);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-contrast: more) {
  .btn,
  input,
  textarea {
    border-width: 3px;
  }
}

@media (max-width: 768px) {
  .only-wide {
    display: none;
  }
}