/* ==========================================================================
   PDF CONVERTER BOT • DESIGN SYSTEM: THEMES, SKELETONS & CONTROLS
   File: theme.css
   Author: Senior Frontend Engineer & UI/UX Specialist
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Root Variables & Light Theme Palette
   -------------------------------------------------------------------------- */
:root {
  --skeleton-bg: rgba(255, 255, 255, 0.06);
  --skeleton-shimmer: rgba(255, 255, 255, 0.16);
  --theme-transition-duration: 0.25s;
  --theme-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --theme-shadow-md: 0 4px 20px rgba(0, 0, 0, 0.06);
  --theme-shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.09);
}

/* Light Theme Variables & Overrides */
[data-theme="light"] {
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #fcfdfe;
  --border: rgba(15, 23, 42, 0.09);
  --border-focus: rgba(37, 99, 235, 0.45);

  --blue: #2563eb;
  --blue-glow: rgba(37, 99, 235, 0.14);
  --cyan: #0891b2;
  --purple: #7c3aed;
  --purple-glow: rgba(124, 58, 237, 0.14);
  --emerald: #059669;
  --emerald-glow: rgba(5, 150, 105, 0.14);
  --amber: #d97706;

  --text-main: #0f172a;
  --text-muted: #334155;
  --text-dim: #64748b;

  --skeleton-bg: #e2e8f0;
  --skeleton-shimmer: #cbd5e1;
}

/* Smooth color transitions for theme switches */
body, .navbar, .stat-card, .goal-card, .calc-card, .chart-card, .event-card, .cta-banner, .footer {
  transition: background-color var(--theme-transition-duration) ease,
              border-color var(--theme-transition-duration) ease,
              color var(--theme-transition-duration) ease,
              box-shadow var(--theme-transition-duration) ease;
}

/* --------------------------------------------------------------------------
   2. Light Theme Layout & Component Adaptations
   -------------------------------------------------------------------------- */
[data-theme="light"] body {
  background-color: var(--bg);
  color: var(--text-main);
}

[data-theme="light"] .glow-orb {
  opacity: 0.12;
  filter: blur(120px);
}

[data-theme="light"] .grid-pattern {
  background-image: radial-gradient(rgba(15, 23, 42, 0.04) 1px, transparent 1px);
  mask-image: radial-gradient(ellipse at 50% 30%, black 50%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 30%, black 50%, transparent 85%);
}

/* Navbar */
[data-theme="light"] .navbar {
  background: rgba(248, 250, 252, 0.88);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

[data-theme="light"] .brand-name {
  color: var(--text-main);
}

[data-theme="light"] .brand-icon {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(124, 58, 237, 0.12));
  border-color: rgba(37, 99, 235, 0.25);
}

[data-theme="light"] .nav-status {
  background: rgba(15, 23, 42, 0.04);
  border-color: var(--border);
  color: var(--text-muted);
}

[data-theme="light"] .btn-outline {
  background: #ffffff;
  border-color: var(--border);
  color: var(--text-main);
  box-shadow: var(--theme-shadow-sm);
}

[data-theme="light"] .btn-outline:hover {
  background: #f1f5f9;
  border-color: rgba(15, 23, 42, 0.18);
}

/* Hero Section */
[data-theme="light"] .hero-badge {
  background: rgba(37, 99, 235, 0.08);
  border-color: rgba(37, 99, 235, 0.22);
  color: #1d4ed8;
}

[data-theme="light"] .hero-title {
  color: #0f172a;
}

[data-theme="light"] .hero-subtitle {
  color: #475569;
}

[data-theme="light"] .hero-features-bar {
  background: rgba(255, 255, 255, 0.88);
  border-color: var(--border);
  box-shadow: var(--theme-shadow-md);
}

[data-theme="light"] .feature-item {
  color: #334155;
}

/* Live Marquee Ticker */
[data-theme="light"] .ticker-wrap {
  background: rgba(241, 245, 249, 0.8);
  border-color: var(--border);
}

[data-theme="light"] .ticker-wrap::before {
  background: linear-gradient(90deg, var(--bg) 0%, transparent 100%);
}

[data-theme="light"] .ticker-wrap::after {
  background: linear-gradient(-90deg, var(--bg) 0%, transparent 100%);
}

[data-theme="light"] .ticker-item {
  color: #475569;
  border-right-color: rgba(15, 23, 42, 0.08);
}

/* Stat Cards & Grid */
[data-theme="light"] .stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--theme-shadow-md);
}

[data-theme="light"] .stat-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(37, 99, 235, 0.28);
  box-shadow: var(--theme-shadow-lg);
  transform: translateY(-4px);
}

[data-theme="light"] .stat-value {
  color: #0f172a !important;
}

[data-theme="light"] .stat-icon-wrap {
  background: #f8fafc;
  border-color: var(--border);
}

[data-theme="light"] .stat-card-glow {
  opacity: 0.12;
}

/* Goal Card */
[data-theme="light"] .goal-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--theme-shadow-md);
}

[data-theme="light"] .goal-title {
  color: #0f172a;
}

[data-theme="light"] .goal-subtitle {
  color: #475569;
}

[data-theme="light"] .goal-stat-item strong {
  color: #0f172a !important;
}

[data-theme="light"] .progress-bar-container {
  background: #e2e8f0;
}

[data-theme="light"] .goal-percent-badge {
  background: rgba(37, 99, 235, 0.1);
  border-color: rgba(37, 99, 235, 0.25);
  color: #1d4ed8;
}

/* Calculator */
[data-theme="light"] .calc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--theme-shadow-md);
}

[data-theme="light"] .calc-title {
  color: #0f172a;
}

[data-theme="light"] .calc-subtitle {
  color: #475569;
}

[data-theme="light"] .calc-slider-box {
  background: #f8fafc;
  border: 1px solid var(--border);
}

[data-theme="light"] .calc-label {
  color: #0f172a;
}

[data-theme="light"] .calc-slider {
  background: #e2e8f0;
}

[data-theme="light"] .calc-slider::-webkit-slider-thumb {
  background: #2563eb;
  border-color: #ffffff;
  box-shadow: 0 0 14px rgba(37, 99, 235, 0.5);
}

[data-theme="light"] .calc-slider::-moz-range-thumb {
  background: #2563eb;
  border-color: #ffffff;
  box-shadow: 0 0 14px rgba(37, 99, 235, 0.5);
}

[data-theme="light"] .calc-current-value {
  background: rgba(37, 99, 235, 0.09);
  border-color: rgba(37, 99, 235, 0.25);
  color: #1d4ed8;
}

[data-theme="light"] .calc-current-value span:first-child {
  color: #0f172a !important;
}

[data-theme="light"] .preset-pill {
  background: #ffffff;
  border-color: var(--border);
  color: #334155;
}

[data-theme="light"] .preset-pill:hover {
  background: #f1f5f9;
  border-color: rgba(15, 23, 42, 0.18);
}

[data-theme="light"] .preset-pill.active {
  background: #2563eb;
  color: #ffffff;
  border-color: #2563eb;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
}

[data-theme="light"] .calc-result-card {
  background: #ffffff;
  border: 1px solid var(--border);
  box-shadow: var(--theme-shadow-sm);
}

[data-theme="light"] .result-title {
  color: #64748b;
}

[data-theme="light"] .result-value {
  color: #0f172a !important;
}

[data-theme="light"] .result-desc {
  color: #475569;
}

/* Charts */
[data-theme="light"] .chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--theme-shadow-md);
}

[data-theme="light"] .chart-title-wrap h3 {
  color: #0f172a;
}

[data-theme="light"] .chart-title-wrap p {
  color: #475569;
}

[data-theme="light"] .chart-actions {
  background: #f1f5f9;
  border-color: var(--border);
}

[data-theme="light"] .chart-tab-btn {
  color: #64748b;
}

[data-theme="light"] .chart-tab-btn.active {
  background: #ffffff;
  color: #1d4ed8 !important;
  border-color: rgba(37, 99, 235, 0.25);
  box-shadow: var(--theme-shadow-sm);
}

[data-theme="light"] .format-name {
  color: #334155;
}

[data-theme="light"] .format-count {
  color: #0f172a;
}

[data-theme="light"] .format-pct {
  color: #64748b;
}

/* Pulse / Events */
[data-theme="light"] .event-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--theme-shadow-sm);
}

[data-theme="light"] .event-title {
  color: #0f172a !important;
}

[data-theme="light"] .event-desc {
  color: #475569;
}

/* Final CTA Banner */
[data-theme="light"] .cta-banner {
  background: radial-gradient(ellipse at 50% 0%, rgba(37, 99, 235, 0.08) 0%, #ffffff 80%);
  border: 1px solid rgba(37, 99, 235, 0.22);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .cta-banner h2 {
  color: #0f172a;
}

[data-theme="light"] .cta-banner p {
  color: #475569;
}

/* Footer */
[data-theme="light"] .footer {
  border-top-color: var(--border);
  color: #64748b;
}

[data-theme="light"] .footer-links a {
  color: #475569;
}

[data-theme="light"] .footer-links a:hover {
  color: #0f172a !important;
}

/* Toast */
[data-theme="light"] .toast {
  background: #ffffff;
  color: #0f172a;
  border-color: var(--border);
  box-shadow: var(--theme-shadow-lg);
}


/* --------------------------------------------------------------------------
   3. Skeleton Loaders with Shimmer Animation (IDEA 6)
   -------------------------------------------------------------------------- */
.skeleton {
  display: inline-block !important;
  position: relative;
  overflow: hidden;
  background: var(--skeleton-bg) !important;
  border-radius: var(--radius-sm, 8px) !important;
  color: transparent !important;
  pointer-events: none !important;
  user-select: none !important;
  min-height: 1.2em;
  min-width: 65px;
  vertical-align: middle;
}

.stat-value.skeleton {
  min-width: 140px;
  min-height: 2.5rem;
  height: 2.5rem;
  border-radius: 10px !important;
}

.skeleton-text {
  min-width: 90px;
  height: 1.2em;
}

.skeleton::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  transform: translateX(-100%);
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--skeleton-shimmer) 50%,
    transparent 100%
  );
  animation: skeletonShimmer 1.6s ease-in-out infinite;
}

@keyframes skeletonShimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

/* Smooth Fade In Transition when real metrics replace skeletons */
.fade-in {
  animation: fadeInSmooth 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeInSmooth {
  from {
    opacity: 0.15;
    transform: translateY(3px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


/* --------------------------------------------------------------------------
   4. Navbar Interactive Controls: Theme Switcher & Language Selector
   -------------------------------------------------------------------------- */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  position: relative;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  color: var(--text-main);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 0;
  flex-shrink: 0;
}

[data-theme="light"] .theme-toggle-btn {
  background: #ffffff;
  border-color: var(--border);
  box-shadow: var(--theme-shadow-sm);
  color: #0f172a;
}

.theme-toggle-btn:hover {
  transform: scale(1.06);
  border-color: var(--border-focus);
  box-shadow: 0 0 14px var(--blue-glow);
}

.theme-toggle-btn:active {
  transform: scale(0.94);
}

.theme-icon-sun,
.theme-icon-moon {
  position: absolute;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.25s ease;
  width: 19px;
  height: 19px;
}

/* Default Dark: Show Sun icon to invite Light mode */
:root:not([data-theme="light"]) .theme-icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: #fbbf24;
}

:root:not([data-theme="light"]) .theme-icon-moon {
  opacity: 0;
  transform: rotate(90deg) scale(0.4);
}

/* Light Mode: Show Moon icon to invite Dark mode */
[data-theme="light"] .theme-icon-sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0.4);
}

[data-theme="light"] .theme-icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: #6366f1;
}

/* Language Selector Dropdown */
.lang-dropdown {
  position: relative;
  flex-shrink: 0;
}

.lang-btn {
  height: 40px;
  padding: 0 12px;
  border-radius: var(--radius-md, 14px);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  user-select: none;
}

[data-theme="light"] .lang-btn {
  background: #ffffff;
  border-color: var(--border);
  box-shadow: var(--theme-shadow-sm);
  color: #0f172a;
}

.lang-btn:hover {
  border-color: var(--border-focus);
  box-shadow: 0 0 12px var(--blue-glow);
}

.lang-flag {
  font-size: 1.05rem;
  line-height: 1;
}

.lang-code {
  font-weight: 700;
}

.lang-chevron {
  transition: transform 0.25s ease;
  color: var(--text-muted);
}

.lang-dropdown.open .lang-chevron {
  transform: rotate(180deg);
}

.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 165px;
  background: rgba(13, 17, 27, 0.96);
  border: 1px solid var(--border);
  border-radius: var(--radius-md, 14px);
  padding: 6px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.2s cubic-bezier(0.16, 1, 0.3, 1),
              visibility 0.2s;
  z-index: 120;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

[data-theme="light"] .lang-menu {
  background: #ffffff;
  border-color: var(--border);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.12);
}

.lang-dropdown.open .lang-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 8px 12px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
  text-align: left;
}

.lang-item-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lang-item .flag {
  font-size: 1rem;
}

.lang-item .tag {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-dim);
}

[data-theme="light"] .lang-item .tag {
  background: #f1f5f9;
  color: #64748b;
}

.lang-item:hover {
  background: rgba(59, 130, 246, 0.12);
  color: var(--text-main);
}

.lang-item.active {
  background: rgba(59, 130, 246, 0.2);
  color: #60a5fa;
}

[data-theme="light"] .lang-item.active {
  background: rgba(37, 99, 235, 0.12);
  color: #1d4ed8;
}

.lang-item.active .tag {
  background: rgba(59, 130, 246, 0.3);
  color: #ffffff;
}

[data-theme="light"] .lang-item.active .tag {
  background: #2563eb;
  color: #ffffff;
}

/* --------------------------------------------------------------------------
   5. Responsive Tweaks for Navbar Controls
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  .nav-actions {
    gap: 0.4rem;
  }
  .lang-btn {
    padding: 0 8px;
    height: 36px;
  }
  .theme-toggle-btn {
    width: 36px;
    height: 36px;
  }
  .btn-share span {
    display: none;
  }
  .btn-share {
    padding: 0.55rem 0.75rem;
    height: 36px;
  }
  .navbar .btn-primary span {
    font-size: 0.85rem;
  }
}