/* Humanizator Web Design System - Ultra-Flat Architectural Theme (Syne + DM Sans + IBM Plex Mono) */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&family=Syne:wght@600;700;800&display=swap');

:root {
  /* Golden Ratio Constant */
  --phi: 1.618;

  /* Golden Ratio Spacing Scale (8px base * 1.618) */
  --space-3xs: 5px;
  --space-2xs: 8px;
  --space-xs: 13px;  /*  8 * 1.618 */
  --space-sm: 21px;  /* 13 * 1.618 */
  --space-md: 34px;  /* 21 * 1.618 */
  --space-lg: 55px;  /* 34 * 1.618 */
  --space-xl: 89px;  /* 55 * 1.618 */

  /* Golden Ratio Typography Scale */
  --font-xs: 0.75rem;
  --font-sm: 0.85rem;
  --font-base: 1rem;
  --font-md: 1.25rem;   /* 1 * 1.25 */
  --font-lg: 1.618rem;  /* Golden Ratio Title */
  --font-xl: 2.618rem;  /* Phi^2 Super Title */

  --line-height-phi: 1.618;

  /* Color Palette - 75% Dark Violet / 10% Cyan / 10% Magenta / 5% Red */
  --bg-dark: #100720;
  --bg-navy: #160A2C;
  --card-bg: #1B0D36;
  --card-border: #2D1654;
  --card-border-hover: #00C2FF;
  
  --cyan-vibrant: #00C2FF;
  --cyan-subtle: rgba(0, 194, 255, 0.12);

  --magenta-neon: #E500EF;
  --magenta-subtle: rgba(229, 0, 239, 0.12);

  --red-intense: #ED0F15;
  --red-subtle: rgba(237, 15, 21, 0.12);
  
  --text-main: #F8FAFC;
  --text-muted: #CBD5E1;
  --text-dim: #94A3B8;
  
  --success-green: #10B981;
  
  /* Distinctive Non-AI Typography Stack */
  --font-heading: 'Syne', system-ui, sans-serif;
  --font-sans: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  
  /* Flat Architectural Geometry (Zero Blurry Box-Shadow Glows) */
  --radius-card: 8px;
  --radius-button: 6px;
  --radius-input: 6px;
  --radius-badge: 4px;
  --radius-pill: 6px;
  
  --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Accessibility Utility */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

*:focus-visible {
  outline: 2px solid var(--cyan-vibrant);
  outline-offset: 2px;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: var(--line-height-phi);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Background Texture & Flowing Lines Overlay */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('/static/img/flowing_lines_bg.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.30;
  pointer-events: none;
  z-index: 0;
}

.app-wrapper {
  position: relative;
  z-index: 1;
  max-width: 1360px;
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md) var(--space-lg) var(--space-md);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* --- HEADER & NAVIGATION --- */
.site-header {
  margin-bottom: var(--space-md);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-xs) var(--space-sm);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-card);
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  text-decoration: none;
  color: inherit;
}

.brand-link:hover .logo-badge {
  border-color: var(--magenta-neon);
}

.logo-badge {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--cyan-vibrant), var(--magenta-neon));
  border: 1px solid var(--card-border);
  border-radius: var(--radius-input);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.logo-badge svg {
  width: 22px;
  height: 22px;
  fill: #FFFFFF;
}

.brand-title {
  font-family: var(--font-heading);
  font-size: var(--font-md);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

.brand-title span {
  color: var(--cyan-vibrant);
}

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

.lang-selector-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
}

.lang-label {
  font-size: var(--font-xs);
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.lang-select {
  background: var(--bg-navy);
  color: var(--text-main);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-input);
  padding: 6px 14px;
  font-family: var(--font-sans);
  font-size: var(--font-sm);
  font-weight: 600;
  cursor: pointer;
  outline: none;
  transition: var(--transition-fast);
}

.lang-select:hover, .lang-select:focus {
  border-color: var(--cyan-vibrant);
}

.nav-link {
  color: var(--cyan-vibrant);
  font-size: var(--font-sm);
  font-weight: 700;
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius-button);
  border: 1px solid transparent;
  transition: var(--transition-fast);
}

.nav-link:hover {
  background: var(--cyan-subtle);
  border-color: var(--cyan-vibrant);
}

/* --- HERO BANNER --- */
.hero-banner {
  text-align: center;
  margin-bottom: var(--space-md);
  max-width: 890px;
  margin-left: auto;
  margin-right: auto;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: var(--font-xl);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-2xs);
  background: linear-gradient(135deg, #FFFFFF 0%, var(--cyan-vibrant) 50%, var(--magenta-neon) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* --- MAIN WORKBENCH --- */
.workbench-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

@media (max-width: 1024px) {
  .workbench-grid {
    grid-template-columns: 1fr;
  }
}

.card-panel {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-card);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: var(--transition-fast);
}

.card-panel:hover {
  border-color: var(--card-border-hover);
}

.output-panel {
  border: 1.5px solid var(--magenta-neon);
}

.panel-header {
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-navy);
  border-bottom: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2xs);
}

.panel-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.panel-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-main);
}

.badge-mode {
  background: var(--magenta-subtle);
  color: var(--magenta-neon);
  border: 1px solid var(--magenta-neon);
  border-radius: var(--radius-badge);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 2px 8px;
}

/* Mode Tabs */
.mode-tabs {
  display: flex;
  background: var(--bg-dark);
  padding: 3px;
  border-radius: var(--radius-input);
  border: 1px solid var(--card-border);
  flex-wrap: wrap;
  gap: 2px;
}

.mode-tab {
  padding: 5px var(--space-xs);
  font-size: var(--font-xs);
  font-weight: 600;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-fast);
}

.mode-tab.active {
  background: linear-gradient(135deg, var(--cyan-vibrant), var(--magenta-neon));
  color: #FFFFFF;
}

/* Editor Container & Line Numbers Gutter */
.editor-body {
  position: relative;
  flex: 1;
  min-height: 380px;
  display: flex;
  background: transparent;
  overflow: hidden;
}

.line-numbers {
  width: 48px;
  padding: var(--space-sm) 0;
  background: var(--bg-navy);
  border-right: 1px solid var(--card-border);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: var(--line-height-phi);
  text-align: right;
  padding-right: var(--space-2xs);
  user-select: none;
  display: none; /* Dynamic for code mode */
}

.editor-body.show-lines .line-numbers {
  display: block;
}

.code-textarea {
  flex: 1;
  width: 100%;
  height: 100%;
  min-height: 380px;
  padding: var(--space-sm);
  background: transparent;
  border: none;
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: var(--line-height-phi);
  resize: none;
  outline: none;
  white-space: pre;
  tab-size: 4;
}

.code-textarea::placeholder {
  color: var(--text-dim);
}

/* Loading Overlay & Spinner */
.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(27, 13, 54, 0.92);
  backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  z-index: 10;
  color: var(--magenta-neon);
  font-family: var(--font-heading);
  font-weight: 600;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid rgba(229, 0, 239, 0.2);
  border-top-color: var(--magenta-neon);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.panel-footer {
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-navy);
  border-top: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--font-sm);
  color: var(--text-muted);
}

/* --- BUTTONS --- */
.btn-primary-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: 9px var(--space-sm);
  background: linear-gradient(135deg, var(--cyan-vibrant), var(--magenta-neon));
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  border: 1px solid transparent;
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-primary-pill:hover {
  border-color: #FFFFFF;
  transform: translateY(-1px);
}

.btn-secondary-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: 8px var(--space-xs);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-main);
  font-size: var(--font-sm);
  font-weight: 600;
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-secondary-pill:hover {
  border-color: var(--cyan-vibrant);
  background: var(--bg-navy);
}

/* --- CUSTOMIZATION SETTINGS DRAWER --- */
.settings-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-card);
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
}

.settings-header {
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.settings-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.sliders-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-sm);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.control-label {
  display: flex;
  justify-content: space-between;
  font-size: var(--font-sm);
  font-weight: 600;
  color: var(--text-muted);
}

.slider-val {
  color: var(--cyan-vibrant);
  font-family: var(--font-mono);
}

.custom-range {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(to right, var(--cyan-vibrant) 0%, var(--magenta-neon) var(--fill-percent, 30%), var(--bg-navy) var(--fill-percent, 30%), var(--bg-navy) 100%);
  outline: none;
  transition: var(--transition-fast);
}

.custom-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 3px;
  background: var(--red-intense);
  cursor: pointer;
  border: 1px solid #FFFFFF;
}

/* --- FEATURES GRID --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-card);
  padding: var(--space-sm);
  transition: var(--transition-fast);
}

.feature-card:hover {
  border-color: var(--cyan-vibrant);
}

.feature-icon {
  width: 44px;
  height: 44px;
  background: var(--cyan-subtle);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-input);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-xs);
}

.feature-icon svg {
  width: 22px;
  height: 22px;
  fill: var(--cyan-vibrant);
}

.feature-heading {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-2xs);
}

.feature-desc {
  font-size: var(--font-sm);
  color: var(--text-muted);
}

/* --- FOOTER --- */
.site-footer {
  border-top: 1px solid var(--card-border);
  padding-top: var(--space-md);
  text-align: center;
  font-size: var(--font-sm);
  color: var(--text-dim);
}

.site-footer a {
  color: var(--cyan-vibrant);
  text-decoration: none;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-xs);
}

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

.footer-link:hover {
  color: var(--magenta-neon);
}

.footer-link.highlight {
  color: var(--magenta-neon);
  font-weight: 700;
}

/* --- DYNAMIC RESPONSIVE BREAKPOINTS (Mobile & Tablet) --- */
@media (max-width: 768px) {
  .app-wrapper {
    padding: var(--space-xs);
  }

  .site-nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-right {
    width: 100%;
    justify-content: space-between;
  }

  .hero-title {
    font-size: 1.8rem;
  }

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