/* ========================================
   CSS Custom Properties & Theme
   ======================================== */

:root {
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 50%;

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

/* Dark Theme (default) */
[data-theme="dark"] {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: rgba(22, 22, 35, 0.85);
  --bg-card-border: rgba(255, 255, 255, 0.08);
  --bg-action: rgba(255, 255, 255, 0.06);
  --bg-action-hover: rgba(255, 255, 255, 0.12);
  --bg-save: #6366f1;
  --bg-save-hover: #818cf8;
  --text-primary: #f1f1f4;
  --text-secondary: #9394a5;
  --text-muted: #5e5f73;
  --text-on-save: #ffffff;
  --accent: #818cf8;
  --accent-glow: rgba(129, 140, 248, 0.25);
  --gradient-start: #6366f1;
  --gradient-end: #a855f7;
  --detail-row-hover: rgba(255, 255, 255, 0.04);
  --social-hover: rgba(255, 255, 255, 0.1);
  --qr-bg: #ffffff;
  --shadow-card: 0 8px 40px rgba(0, 0, 0, 0.4), 0 0 80px rgba(99, 102, 241, 0.06);
  --shadow-avatar: 0 4px 20px rgba(99, 102, 241, 0.3);
  --toggle-bg: rgba(255, 255, 255, 0.08);
  --toggle-hover: rgba(255, 255, 255, 0.15);
  --divider: rgba(255, 255, 255, 0.06);
}

/* Light Theme */
[data-theme="light"] {
  --bg-primary: #f5f5f7;
  --bg-secondary: #eeeef0;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-border: rgba(0, 0, 0, 0.06);
  --bg-action: rgba(0, 0, 0, 0.04);
  --bg-action-hover: rgba(0, 0, 0, 0.08);
  --bg-save: #6366f1;
  --bg-save-hover: #4f46e5;
  --text-primary: #1a1a2e;
  --text-secondary: #64648c;
  --text-muted: #9898b0;
  --text-on-save: #ffffff;
  --accent: #6366f1;
  --accent-glow: rgba(99, 102, 241, 0.2);
  --gradient-start: #6366f1;
  --gradient-end: #a855f7;
  --detail-row-hover: rgba(0, 0, 0, 0.03);
  --social-hover: rgba(0, 0, 0, 0.06);
  --qr-bg: #ffffff;
  --shadow-card: 0 8px 40px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-avatar: 0 4px 20px rgba(99, 102, 241, 0.2);
  --toggle-bg: rgba(0, 0, 0, 0.06);
  --toggle-hover: rgba(0, 0, 0, 0.1);
  --divider: rgba(0, 0, 0, 0.06);
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--space-lg);
  transition: background-color var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
}

/* ========================================
   Background
   ======================================== */

.page-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, var(--accent-glow), transparent),
    radial-gradient(ellipse 40% 40% at 80% 80%, rgba(168, 85, 247, 0.08), transparent);
  transition: opacity var(--transition-slow);
}

/* ========================================
   Theme Toggle
   ======================================== */

.theme-toggle {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 100;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--toggle-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: background var(--transition-base), color var(--transition-base), transform var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--toggle-hover);
  color: var(--text-primary);
  transform: scale(1.08);
}

.theme-toggle:active {
  transform: scale(0.95);
}

[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* ========================================
   Card Container
   ======================================== */

.card-container {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

/* ========================================
   Card
   ======================================== */

.card {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: var(--shadow-card);
  padding: var(--space-2xl) var(--space-xl) var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  transition: background var(--transition-slow), border-color var(--transition-slow), box-shadow var(--transition-slow);
  animation: cardEnter 0.6s ease-out;
}

@keyframes cardEnter {
  from {
    opacity: 0;
    transform: translateY(24px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ========================================
   Profile Header
   ======================================== */

.card-header {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.avatar-wrapper {
  position: relative;
  width: 110px;
  height: 110px;
  margin-bottom: var(--space-sm);
}

.avatar-wrapper::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  z-index: 0;
  opacity: 0.8;
}

.avatar,
.avatar-placeholder {
  position: relative;
  z-index: 1;
  width: 110px;
  height: 110px;
  border-radius: var(--radius-full);
  object-fit: contain;
  background: #080810;
  box-shadow: var(--shadow-avatar);
}

.avatar {
  display: none;
}

.avatar.loaded {
  display: block;
}

.avatar-placeholder {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.25rem;
  font-weight: 700;
  color: #fff;
  position: absolute;
  inset: 0;
  margin: auto;
}

.avatar.loaded + .avatar-placeholder,
.avatar.loaded ~ .avatar-placeholder {
  display: none;
}

.name {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.title-company {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.title-company .separator {
  margin: 0 0.35em;
  color: var(--text-muted);
}

/* ========================================
   Quick Actions
   ======================================== */

.actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

.action-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: var(--space-md) var(--space-sm);
  border-radius: var(--radius-md);
  background: var(--bg-action);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 500;
  transition: background var(--transition-base), color var(--transition-base), transform var(--transition-fast);
}

.action-btn:hover {
  background: var(--bg-action-hover);
  color: var(--accent);
  transform: translateY(-2px);
}

.action-btn:active {
  transform: translateY(0) scale(0.97);
}

.action-btn svg {
  color: var(--accent);
  flex-shrink: 0;
}

/* ========================================
   Contact Details
   ======================================== */

.details {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--divider);
  border-bottom: 1px solid var(--divider);
  padding: var(--space-xs) 0;
}

.detail-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: background var(--transition-base), color var(--transition-base);
}

.detail-row:hover {
  background: var(--detail-row-hover);
  color: var(--text-primary);
}

.detail-row svg {
  color: var(--accent);
  flex-shrink: 0;
  align-self: flex-start;
  margin-top: 2px;
}

.detail-row span {
  white-space: pre-line;
  line-height: 1.5;
}

.detail-label-group {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.detail-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 500;
}

/* ========================================
   Social Links
   ======================================== */

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.social-btn {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-action);
  color: var(--text-secondary);
  transition: background var(--transition-base), color var(--transition-base), transform var(--transition-fast), box-shadow var(--transition-base);
}

.social-btn:hover {
  background: var(--social-hover);
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.social-btn:active {
  transform: translateY(0) scale(0.93);
}

/* ========================================
   Save Contact Button
   ======================================== */

.save-section {
  display: flex;
  justify-content: center;
}

.save-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-on-save);
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 50px;
  box-shadow: 0 4px 20px var(--accent-glow);
  transition: transform var(--transition-fast), box-shadow var(--transition-base), opacity var(--transition-base);
}

.save-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px var(--accent-glow);
}

.save-btn:active {
  transform: translateY(0) scale(0.97);
}

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

.qr-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.qr-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

.qr-code {
  background: var(--qr-bg);
  padding: 12px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

.qr-code img,
.qr-code canvas {
  display: block;
  width: 140px;
  height: 140px;
}

/* ========================================
   Footer
   ======================================== */

.footer {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer strong {
  color: var(--text-secondary);
  font-weight: 600;
}

/* ========================================
   Hidden Utility
   ======================================== */

.hidden {
  display: none !important;
}

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

@media (max-width: 480px) {
  body {
    padding: var(--space-md);
    align-items: flex-start;
    padding-top: 60px;
  }

  .card {
    padding: var(--space-xl) var(--space-lg) var(--space-lg);
    border-radius: var(--radius-md);
  }

  .name {
    font-size: 1.4rem;
  }

  .avatar-wrapper {
    width: 96px;
    height: 96px;
  }

  .avatar,
  .avatar-placeholder {
    width: 96px;
    height: 96px;
  }

  .avatar-placeholder {
    font-size: 2rem;
  }

  .save-btn {
    width: 100%;
    justify-content: center;
  }

  .theme-toggle {
    top: var(--space-md);
    right: var(--space-md);
  }
}

@media (max-width: 360px) {
  .actions {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Auto Save Prompt
   ======================================== */

.save-prompt {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  padding: var(--space-md);
  transform: translateY(100%);
  opacity: 0;
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.4s ease;
  pointer-events: none;
}

.save-prompt.visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.save-prompt.dismissing {
  transform: translateY(100%);
  opacity: 0;
  transition: transform 0.35s ease-in, opacity 0.3s ease-in;
}

.save-prompt-content {
  max-width: 420px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: 0 -4px 30px rgba(0, 0, 0, 0.2), 0 0 60px var(--accent-glow);
}

.save-prompt-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  animation: promptPulse 2s ease-in-out infinite;
}

@keyframes promptPulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); }
  50% { box-shadow: 0 0 0 10px transparent; }
}

.save-prompt-text {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.save-prompt-text strong {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.save-prompt-text span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.save-prompt-btn {
  flex-shrink: 0;
  padding: 10px 22px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-base);
  box-shadow: 0 2px 12px var(--accent-glow);
}

.save-prompt-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 18px var(--accent-glow);
}

.save-prompt-btn:active {
  transform: scale(0.96);
}

.save-prompt-close {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: transparent;
  border: none;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--transition-base), color var(--transition-base);
}

.save-prompt-close:hover {
  background: var(--bg-action-hover);
  color: var(--text-primary);
}

@media (max-width: 480px) {
  .save-prompt {
    padding: var(--space-sm);
  }

  .save-prompt-content {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
  }
}

/* ========================================
   NFC Writer Page (reused styles)
   ======================================== */

.nfc-container {
  width: 100%;
  max-width: 480px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xl);
}

.nfc-container h1 {
  font-size: 1.5rem;
  font-weight: 700;
}

.nfc-container p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.nfc-icon {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 6px 30px var(--accent-glow);
}

.nfc-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 16px 36px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 50px;
  box-shadow: 0 4px 20px var(--accent-glow);
  transition: transform var(--transition-fast), box-shadow var(--transition-base);
}

.nfc-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px var(--accent-glow);
}

.nfc-btn:active {
  transform: translateY(0) scale(0.97);
}

.nfc-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.nfc-status {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  transition: background var(--transition-base), color var(--transition-base);
}

.nfc-status.info {
  background: var(--bg-action);
  color: var(--text-secondary);
}

.nfc-status.success {
  background: rgba(34, 197, 94, 0.12);
  color: #22c55e;
}

.nfc-status.error {
  background: rgba(239, 68, 68, 0.12);
  color: #ef4444;
}

.nfc-url-display {
  padding: var(--space-md);
  background: var(--bg-action);
  border-radius: var(--radius-sm);
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.85rem;
  color: var(--accent);
  word-break: break-all;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.05); opacity: 0.8; }
}

.nfc-btn.writing {
  animation: pulse 1.5s ease-in-out infinite;
}