/* ===== MODERN CSS RESET ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-lg));
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

/* Remove default button styles */
button {
  background: none;
  border: none;
  font: inherit;
  cursor: pointer;
  outline: none;
}

/* Remove default input styles */
input,
textarea,
select {
  font: inherit;
  background: transparent;
  border: none;
  outline: none;
}

/* Remove default list styles */
ul,
ol {
  list-style: none;
}

/* Remove default link styles */
a {
  color: inherit;
  text-decoration: none;
}

/* Improve image defaults */
img,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ===== LAYOUT STRUCTURE ===== */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-top: var(--header-height);
  padding-bottom: var(--footer-height);
}

.main-content {
  flex: 1;
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

/* ===== FLOATING HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-overlay);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  z-index: var(--z-fixed);
  display: flex;
  align-items: center;
  padding: 0 var(--space-lg);
}

.header__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
}

.header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
}

.header__brand-icon {
  font-size: var(--font-size-2xl);
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.header__nav-link {
  color: var(--text-primary);
  text-decoration: none;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.header__nav-link:hover {
  background: var(--bg-secondary);
  color: var(--primary-color);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* ===== FLOATING FOOTER ===== */
.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--footer-height);
  background: var(--bg-overlay);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--border-light);
  z-index: var(--z-fixed);
  display: flex;
  align-items: center;
  padding: 0 var(--space-lg);
}

.footer__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.footer__left {
  display: flex;
  align-items: center;
}

.footer__center {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.footer__right {
  display: flex;
  align-items: center;
}

.footer__link {
  color: var(--primary-color);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--primary-hover);
}

/* ===== FLOATING KO-FI BUTTON ===== */
.kofi-button {
  position: fixed;
  bottom: calc(var(--footer-height) + var(--space-lg));
  left: var(--space-lg);
  z-index: var(--z-tooltip);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-xl);
  padding: var(--space-sm) var(--space-md);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  text-decoration: none;
}

.kofi-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.kofi-button__icon {
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, #ff5f5f, #ff9500);
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

/* Adjust Ko-fi positioning on small screens */
@media (max-width: 768px) {
  .kofi-button {
    bottom: calc(var(--footer-height) + var(--space-2xl) + 3rem); /* Account for feedback button */
    /* Keep same size as feedback button on mobile */
    font-size: var(--font-size-sm);
    padding: var(--space-sm) var(--space-md);
  }
  
  .kofi-button__icon {
    width: 20px;
    height: 20px;
    font-size: 12px;
  }
}

/* ===== BUTTON COMPONENTS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border: 1px solid transparent;
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

.btn--primary {
  background: var(--primary-color);
  color: var(--text-inverse);
}

.btn--primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn--secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary-color);
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn--ghost:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.btn--small {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-xs);
}

.btn--large {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-lg);
}

.btn--icon-only {
  padding: var(--space-sm);
  width: 2.5rem;
  height: 2.5rem;
}

/* ===== THEME TOGGLE BUTTON ===== */
.theme-toggle {
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--border-radius-full);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.theme-toggle:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary-color);
  transform: scale(1.05);
}

.theme-toggle__icon {
  font-size: var(--font-size-lg);
  transition: transform var(--transition-normal);
}

.theme-toggle[data-theme="dark"] .theme-toggle__icon {
  transform: rotate(180deg);
}

/* ===== INSTALL BUTTON ===== */
.install-prompt {
  display: none;
  align-items: center;
  gap: var(--space-sm);
  background: var(--primary-color);
  color: var(--text-inverse);
  border-radius: var(--border-radius-md);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.install-prompt:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.install-prompt.show {
  display: flex;
}

.install-prompt__icon {
  font-size: var(--font-size-base);
}

/* Install prompt as overlay on mobile */
@media (max-width: 768px) {
  .install-prompt.show {
    position: fixed;
    top: calc(var(--header-height) + var(--space-sm));
    right: var(--space-md);
    z-index: var(--z-tooltip);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    opacity: 0;
    visibility: hidden;
    animation: slideInFade 0.3s ease-out forwards;
  }
  
  .install-prompt.show.fade-out {
    animation: slideOutFade 0.3s ease-out forwards;
  }
}

@keyframes slideInFade {
  0% {
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
  }
  100% {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
}

@keyframes slideOutFade {
  0% {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
  }
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  :root {
    --header-height: 3.5rem;
    --footer-height: 3rem;
  }
  
  .header,
  .footer {
    padding: 0 var(--space-md);
  }
  
  .main-content {
    padding: var(--space-lg) var(--space-md);
  }
  
  .header__brand {
    font-size: var(--font-size-base);
  }
  
  .footer__content {
    font-size: var(--font-size-xs);
    gap: var(--space-sm);
  }
  
  .footer__center {
    flex-direction: column;
    gap: var(--space-xs);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .header__nav {
    display: none;
  }
  
  .footer__content {
    flex-direction: column;
    gap: var(--space-xs);
    text-align: center;
  }
  
  .footer__left,
  .footer__right {
    display: none;
  }
}
/* ============================================
   Upgrade Button & Modal Styles (Phase 0)
   ============================================ */

/* Upgrade Button in Header */
.upgrade-button {
  background: linear-gradient(135deg, #ff9500, #ffd700);
  border: none;
  border-radius: var(--border-radius-lg);
  padding: var(--space-xs) var(--space-md);
  color: #000;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  box-shadow: 0 2px 8px rgba(255, 149, 0, 0.3);
}

.upgrade-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 149, 0, 0.4);
}

.upgrade-button__icon {
  font-size: 16px;
}

.upgrade-button__text {
  white-space: nowrap;
}

/* Upgrade Link in Footer */
.upgrade-link {
  color: var(--primary-color);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.upgrade-link:hover {
  color: #ff9500;
  text-decoration: underline;
}

/* Upgrade Modal */
.upgrade-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-modal);
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
}

.upgrade-modal__backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.upgrade-modal__container {
  position: relative;
  background: var(--bg-primary);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-2xl);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  z-index: 1;
}

.upgrade-modal__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
}

.upgrade-modal__header h2 {
  margin: 0;
  font-size: var(--font-size-xl);
  color: var(--text-primary);
}

.upgrade-modal__close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-secondary);
  padding: var(--space-xs);
  line-height: 1;
  transition: color var(--transition-fast);
}

.upgrade-modal__close:hover {
  color: var(--text-primary);
}

.upgrade-modal__body {
  padding: var(--space-lg);
}

.upgrade-feature {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.upgrade-feature__icon {
  font-size: 32px;
  flex-shrink: 0;
}

.upgrade-feature__content h3 {
  margin: 0 0 var(--space-xs) 0;
  font-size: var(--font-size-lg);
  color: var(--text-primary);
}

.upgrade-feature__content p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.6;
}

.upgrade-status {
  margin-top: var(--space-xl);
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--border-radius-lg);
  border-left: 4px solid #ff9500;
}

.upgrade-status p {
  margin: var(--space-xs) 0;
  color: var(--text-secondary);
}

.upgrade-status strong {
  color: var(--text-primary);
}

.upgrade-modal__footer {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-lg);
  border-top: 1px solid var(--border-color);
}

.upgrade-btn {
  flex: 1;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--border-radius-lg);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
}

.upgrade-btn--secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.upgrade-btn--secondary:hover {
  background: var(--bg-tertiary);
}

.upgrade-btn--primary {
  background: linear-gradient(135deg, #ff9500, #ffd700);
  color: #000;
  box-shadow: 0 2px 8px rgba(255, 149, 0, 0.3);
}

.upgrade-btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 149, 0, 0.4);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .upgrade-button__text {
    display: none;
  }

  .upgrade-button {
    padding: var(--space-xs);
  }

  .upgrade-modal__container {
    max-height: 95vh;
  }

  .upgrade-modal__footer {
    flex-direction: column;
  }

  .upgrade-btn {
    width: 100%;
  }
}

/* ============================================
   Batch Processing Table Styles
   ============================================ */

.batch-table-container {
  width: 100%;
  overflow-x: auto;
}

.batch-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
}

.batch-table thead {
  background: var(--bg-secondary);
  border-bottom: 2px solid var(--border-color);
}

.batch-table th {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.batch-table td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border-light);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.batch-table tbody tr {
  transition: background-color var(--transition-fast);
}

.batch-table tbody tr:hover {
  background: var(--bg-secondary);
}

.batch-remove-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  font-size: 16px;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.batch-remove-btn:hover {
  opacity: 1;
}

.batch-empty {
  text-align: center;
  padding: var(--space-xl);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

/* Mobile responsive */
@media (max-width: 768px) {
  .batch-table {
    font-size: var(--font-size-xs);
  }

  .batch-table th,
  .batch-table td {
    padding: var(--space-xs) var(--space-sm);
  }

  .batch-table th:nth-child(4),
  .batch-table td:nth-child(4) {
    display: none; /* Hide aspect ratio on mobile */
  }
}

/* Survey Modal Styles */
.survey-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 10000;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
}

.survey-modal[aria-hidden="false"] {
  display: flex;
}

.survey-content {
  background: var(--card-bg);
  border-radius: 12px;
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.survey-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
}

.survey-header h2 {
  margin: 0 0 var(--space-xs) 0;
  color: var(--text-primary);
  font-size: var(--font-size-lg);
}

.survey-header p {
  margin: 0;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.survey-form-container {
  padding: var(--space-lg);
}

.survey-question {
  margin-bottom: var(--space-lg);
}

.survey-question label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.survey-question .required {
  color: var(--accent-color);
}

.survey-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.survey-option {
  display: flex;
  align-items: center;
  padding: var(--space-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.survey-option:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-color);
}

.survey-option input[type="radio"] {
  margin-right: var(--space-sm);
  cursor: pointer;
}

.survey-option label {
  margin: 0;
  cursor: pointer;
  flex: 1;
  font-weight: normal;
}

.survey-question input[type="email"] {
  width: 100%;
  padding: var(--space-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: var(--font-size-base);
}

.survey-question input[type="email"]:focus {
  outline: none;
  border-color: var(--accent-color);
}

.survey-actions {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-lg);
  border-top: 1px solid var(--border-color);
}

.survey-btn {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  border: none;
  border-radius: 6px;
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.survey-btn-primary {
  background: var(--accent-color);
  color: white;
}

.survey-btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.survey-btn-secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.survey-btn-secondary:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

#survey-thank-you {
  display: none;
  text-align: center;
  padding: var(--space-xl);
}

#survey-thank-you h3 {
  margin: 0 0 var(--space-sm) 0;
  color: var(--text-primary);
  font-size: var(--font-size-lg);
}

#survey-thank-you p {
  margin: 0 0 var(--space-md) 0;
  color: var(--text-secondary);
}

/* Mobile responsive */
@media (max-width: 768px) {
  .survey-content {
    max-height: 95vh;
  }

  .survey-header,
  .survey-form-container,
  .survey-actions {
    padding: var(--space-md);
  }

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

/* Honeypot field - hidden from humans, visible to bots */
.survey-honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}