/* ==========================================================================
   Paper Airplane — Modern Minimalist Design System
   Brand Guide Compliant
   Dark Mode Default with Theme Switcher
   ========================================================================== */

/* --- Custom Properties / Color Palette from Brand Guide --- */
:root {
  /* Brand Gradient Colors (Strict Order: Green -> Yellow -> Orange -> Red -> Purple -> Blue) */
  --pa-green: #62BA48;
  --pa-yellow: #F9B621;
  --pa-orange: #F58220;
  --pa-red: #E2383C;
  --pa-purple: #953E97;
  --pa-blue: #1A9CD6;

  /* Neutrals from Brand Guide */
  --pa-gray-light: #DEDFE0;
  --pa-gray-medium: #BBBCBF;
  --pa-gray-dark: #88898C;

  /* Official Brand Gradient */
  --pa-brand-gradient: linear-gradient(
    90deg,
    #62BA48 0%,
    #F9B621 20%,
    #F58220 40%,
    #E2383C 60%,
    #953E97 80%,
    #1A9CD6 100%
  );

  /* Typography */
  --font-heading: "Rajdhani", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body: "Rubik", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Layout */
  --container-max-width: 1200px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- Dark Theme (Enabled by Default) --- */
:root,
html[data-theme="dark"] {
  --pa-bg: #0E1013;
  --pa-surface: #17191E;
  --pa-surface-elevated: #1F2229;
  --pa-surface-hover: #232730;
  --pa-border: #282C35;
  --pa-border-subtle: #20232A;
  --pa-border-focus: #1A9CD6;
  --pa-text-primary: #FFFFFF;
  --pa-text-secondary: #BBBCBF;
  --pa-text-muted: #88898C;
  --header-bg: rgba(14, 16, 19, 0.88);
  --card-media-bg: #121417;
  --cta-btn-bg: #1F2228;
  --cta-btn-text: #FFFFFF;
  --cta-btn-border: #2B2F38;
  --play-overlay-bg: rgba(23, 25, 30, 0.94);
  --play-overlay-text: #FFFFFF;
  --pill-bg: #17191E;
  --pill-border: #282C35;
  --switch-track: #20232A;
  --switch-thumb: #FFFFFF;
  --footer-bg: #0B0D0F;
  --footer-border: #202329;
  --footer-divider: #1A1D23;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 24px 44px -8px rgba(0, 0, 0, 0.65), 0 8px 20px -4px rgba(0, 0, 0, 0.45);
}

/* --- Light Theme (Activated via Switch) --- */
html[data-theme="light"] {
  --pa-bg: #F8F9FA;
  --pa-surface: #FFFFFF;
  --pa-surface-elevated: #FDFDFE;
  --pa-surface-hover: #F8F9FA;
  --pa-border: #DEDFE0;
  --pa-border-subtle: #E8EAED;
  --pa-border-focus: #1A9CD6;
  --pa-text-primary: #111111;
  --pa-text-secondary: #5A5C60;
  --pa-text-muted: #88898C;
  --header-bg: rgba(255, 255, 255, 0.94);
  --card-media-bg: #EAECEF;
  --cta-btn-bg: #F8F9FA;
  --cta-btn-text: #111111;
  --cta-btn-border: #DEDFE0;
  --play-overlay-bg: rgba(255, 255, 255, 0.94);
  --play-overlay-text: #111111;
  --pill-bg: #FFFFFF;
  --pill-border: #DEDFE0;
  --switch-track: #E4E6EA;
  --switch-thumb: #FFFFFF;
  --footer-bg: #FFFFFF;
  --footer-border: #DEDFE0;
  --footer-divider: #F1F3F5;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05), 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 22px 38px -10px rgba(0, 0, 0, 0.14), 0 8px 18px -4px rgba(0, 0, 0, 0.06);
}

/* --- Base Resets & Global Styles --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--pa-text-primary);
  background-color: var(--pa-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--pa-text-primary);
  line-height: 1.15;
  transition: color var(--transition-normal);
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button, input {
  font-family: inherit;
}

/* --- Header / Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--pa-border);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-accent-bar {
  width: 100%;
  height: 3px;
  background: var(--pa-brand-gradient);
}

.header-inner {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* Header Brand Logo (Button Grouping) */
.brand-logo-btn {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--transition-normal), background-color var(--transition-normal);
}

.brand-logo-btn:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

html[data-theme="light"] .brand-logo-btn:hover {
  background-color: rgba(0, 0, 0, 0.04);
}

.brand-icon-wrapper {
  position: relative;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-icon {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform var(--transition-smooth);
}

/* Hover effect on logo button */
.brand-logo-btn:hover .brand-icon {
  transform: translateY(-2px) rotate(-8deg) scale(1.1);
}

.brand-text-wrapper {
  display: flex;
  flex-direction: column;
  line-height: 0.95;
}

.brand-name-top,
.brand-name-bottom {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 22px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--pa-text-primary);
  transition: color var(--transition-normal);
}

.brand-logo-btn:hover .brand-name-top {
  color: var(--pa-blue);
}

.brand-logo-btn:hover .brand-name-bottom {
  color: var(--pa-green);
}

/* Header Controls: Search, Theme Toggle, Feedback */
.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 14px;
  width: 16px;
  height: 16px;
  color: var(--pa-text-muted);
  pointer-events: none;
  transition: color var(--transition-normal);
}

.search-input {
  width: 200px;
  height: 38px;
  padding: 0 14px 0 38px;
  border-radius: var(--radius-pill);
  border: 1.5px solid var(--pa-border);
  background: var(--pa-surface);
  font-size: 13px;
  color: var(--pa-text-primary);
  outline: none;
  transition: width var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), background-color var(--transition-normal);
}

.search-input::placeholder {
  color: var(--pa-text-muted);
}

.search-input:focus {
  width: 240px;
  border-color: var(--pa-border-focus);
  box-shadow: 0 0 0 3px rgba(26, 156, 214, 0.22);
}

.search-box:focus-within .search-icon {
  color: var(--pa-border-focus);
}

/* --- Dark Mode Toggle Switch --- */
.theme-toggle-switch {
  position: relative;
  width: 58px;
  height: 32px;
  border-radius: var(--radius-pill);
  background-color: var(--switch-track);
  border: 1.5px solid var(--pa-border);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 6px;
  outline: none;
  transition: background-color var(--transition-normal), border-color var(--transition-normal), transform var(--transition-normal);
}

.theme-toggle-switch:hover {
  border-color: var(--pa-gray-medium);
  transform: translateY(-1px);
}

.theme-toggle-switch:focus-visible {
  box-shadow: 0 0 0 3px rgba(26, 156, 214, 0.35);
  border-color: var(--pa-blue);
}

/* Switch Icons (Sun & Moon) */
.switch-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  z-index: 2;
  pointer-events: none;
  transition: opacity var(--transition-normal), color var(--transition-normal);
}

.switch-icon-sun {
  color: #F9B621; /* Brand yellow */
  opacity: 0.45;
}

.switch-icon-moon {
  color: #1A9CD6; /* Brand blue */
  opacity: 0.95;
}

/* Light mode icon state */
html[data-theme="light"] .switch-icon-sun {
  opacity: 1;
}

html[data-theme="light"] .switch-icon-moon {
  opacity: 0.4;
  color: var(--pa-gray-dark);
}

/* Sliding Thumb */
.switch-thumb {
  position: absolute;
  top: 3px;
  left: 4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: var(--switch-thumb);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  pointer-events: none;
  transition: transform var(--transition-smooth), background-color var(--transition-normal);
}

/* In Dark Mode (Default): thumb moves to right side */
html[data-theme="dark"] .switch-thumb {
  transform: translateX(24px);
  background: linear-gradient(135deg, #FFFFFF, #DEDFE0);
}

/* In Light Mode: thumb is on the left side */
html[data-theme="light"] .switch-thumb {
  transform: translateX(0);
  background-color: #FFFFFF;
}

.header-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  border: 1.5px solid var(--pa-border);
  background: var(--pa-surface);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--pa-text-primary);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.header-link-btn:hover {
  background: var(--pa-text-primary);
  color: var(--pa-bg);
  border-color: var(--pa-text-primary);
  transform: translateY(-1px);
}

/* --- Main Layout --- */
.main-content {
  flex: 1;
  max-width: var(--container-max-width);
  width: 100%;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

/* Hero Section */
.hero-section {
  margin-bottom: 40px;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  background: var(--pill-bg);
  border: 1px solid var(--pill-border);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 500;
  color: var(--pa-text-secondary);
  margin-bottom: 14px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.hero-pill-badge .status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--pa-green);
  box-shadow: 0 0 0 3px rgba(98, 186, 72, 0.25);
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(44px, 5vw, 54px); /* Brand guide spec: 54pt negotiable 10pt */
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--pa-text-primary);
  line-height: 1;
  margin-bottom: 12px;
}

/* Iconic Brand Guide Accent Bar (under headings) */
.brand-accent-line {
  width: 88px;
  height: 5px;
  background: var(--pa-brand-gradient);
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
}

.hero-description {
  font-size: 16px; /* Brand guide body spec ~13pt */
  color: var(--pa-text-secondary);
  max-width: 620px;
  line-height: 1.6;
}

/* ==========================================================================
   Games Grid & Interactive Card Groupings (Buttons)
   ========================================================================== */

.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 32px;
}

/* The Card: A grouping of image and text functioning as an interactive button */
.game-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--pa-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--pa-border);
  overflow: hidden;
  text-decoration: none;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-smooth),
              box-shadow var(--transition-smooth),
              border-color var(--transition-normal),
              background-color var(--transition-normal);
  outline: none;
}

/* Focus outline for accessibility */
.game-card:focus-visible {
  box-shadow: 0 0 0 3px rgba(26, 156, 214, 0.45), var(--shadow-hover);
  border-color: var(--pa-blue);
}

/* Top Accent Strip: Brand Gradient reveals on card hover */
.card-accent-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3.5px;
  background: var(--pa-brand-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-smooth);
  z-index: 10;
}

/* Thumbnail / Media Container */
.card-media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: var(--card-media-bg);
  overflow: hidden;
}

.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform var(--transition-smooth), filter var(--transition-normal);
}

/* Floating Play Button Overlay on Thumbnail */
.card-play-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  opacity: 0;
  z-index: 6;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--play-overlay-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--play-overlay-text);
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  pointer-events: none;
  transition: opacity var(--transition-smooth), transform var(--transition-smooth);
}

.play-icon-triangle {
  width: 0;
  height: 0;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 10px solid var(--play-overlay-text);
  transition: border-left-color var(--transition-normal);
}

/* Card Body Content */
.card-body {
  padding: 22px 20px 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  justify-content: space-between;
  background: var(--pa-surface);
  transition: background-color var(--transition-normal);
}

.card-info {
  margin-bottom: 20px;
}

.card-title {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 700;
  color: var(--pa-text-primary);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
  transition: color var(--transition-normal);
}

.card-description {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--pa-text-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Card Bottom Action Button / Pill */
.card-cta-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--cta-btn-border);
  background-color: var(--cta-btn-bg);
  color: var(--cta-btn-text);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  transition: all var(--transition-smooth);
}

.cta-arrow {
  display: inline-block;
  width: 16px;
  height: 16px;
  transition: transform var(--transition-smooth);
}

/* ==========================================================================
   HOVER EFFECTS ON GROUPINGS (Game Cards Functioning as Buttons)
   ========================================================================== */

.game-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: var(--pa-gray-medium);
}

/* Reveal Brand Gradient Bar on Top Edge */
.game-card:hover .card-accent-bar {
  transform: scaleX(1);
}

/* Smooth Image Scale and Brightness Enhancement */
.game-card:hover .card-img {
  transform: scale(1.06);
  filter: brightness(1.05);
}

/* Play Button Overlay Bloom */
.game-card:hover .card-play-overlay {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

/* Title Color Accent Shift to Brand Blue on hover */
.game-card:hover .card-title {
  color: var(--pa-blue);
}

/* Bottom CTA Button Transforms into Brand Gradient Button */
.game-card:hover .card-cta-btn {
  background: var(--pa-brand-gradient);
  color: #FFFFFF;
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(98, 186, 72, 0.3);
}

.game-card:hover .cta-arrow {
  transform: translateX(5px);
}

/* Active / Pressed state on the grouping */
.game-card:active {
  transform: translateY(-3px) scale(0.99);
  box-shadow: var(--shadow-md);
}

/* Empty State (when search has no matches) */
.empty-state {
  display: none;
  text-align: center;
  padding: 60px 20px;
  background: var(--pa-surface);
  border-radius: var(--radius-lg);
  border: 1px dashed var(--pa-border);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.empty-state.visible {
  display: block;
}

.empty-state-title {
  font-size: 22px;
  margin-bottom: 8px;
  color: var(--pa-text-primary);
}

.empty-state-desc {
  font-size: 14px;
  color: var(--pa-text-muted);
}

/* --- Footer --- */
.site-footer {
  margin-top: auto;
  background: var(--footer-bg);
  border-top: 1px solid var(--footer-border);
  padding: 32px 24px;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-inner {
  max-width: var(--container-max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-logo-img {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

.footer-brand-title {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--pa-text-primary);
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13px;
  color: var(--pa-text-muted);
}

.footer-link {
  transition: color var(--transition-normal);
}

.footer-link:hover {
  color: var(--pa-text-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 20px;
  border-top: 1px solid var(--footer-divider);
  font-size: 12px;
  color: var(--pa-text-muted);
}

.footer-tagline {
  font-size: 12px;
  color: var(--pa-text-muted);
}

/* --- Responsive Adjustments --- */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
  }

  .header-actions {
    justify-content: space-between;
    width: 100%;
    flex-wrap: wrap;
  }

  .search-input {
    width: 100%;
  }

  .search-box {
    flex-grow: 1;
    min-width: 180px;
  }

  .main-content {
    padding: 32px 16px 60px;
  }

  .games-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}