:root {
  /* Colors */
  --color-background: rgba(252, 252, 249, 1);
  --color-surface: rgba(255, 255, 253, 1);
  --color-text: rgba(19, 52, 59, 1);
  --color-text-secondary: rgba(98, 108, 113, 1);
  --color-primary: rgba(33, 128, 141, 1);
  --color-primary-hover: rgba(29, 116, 128, 1);
  --color-primary-active: rgba(26, 104, 115, 1);
  --color-secondary: rgba(94, 82, 64, 0.12);
  --color-secondary-hover: rgba(94, 82, 64, 0.2);
  --color-secondary-active: rgba(94, 82, 64, 0.25);
  --color-border: rgba(94, 82, 64, 0.2);
  --color-btn-primary-text: rgba(252, 252, 249, 1);
  --color-card-border: rgba(94, 82, 64, 0.12);
  --color-card-border-inner: rgba(94, 82, 64, 0.12);
  --color-error: rgba(192, 21, 47, 1);
  --color-success: rgba(33, 128, 141, 1);
  --color-warning: rgba(168, 75, 47, 1);
  --color-info: rgba(98, 108, 113, 1);
  --color-focus-ring: rgba(33, 128, 141, 0.4);
  --color-select-caret: rgba(19, 52, 59, 0.8);

  /* Common style patterns */
  --focus-ring: 0 0 0 3px var(--color-focus-ring);
  --focus-outline: 2px solid var(--color-primary);
  --status-bg-opacity: 0.15;
  --status-border-opacity: 0.25;
  --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

  /* RGB versions for opacity control */
  --color-success-rgb: 33, 128, 141;
  --color-error-rgb: 192, 21, 47;
  --color-warning-rgb: 168, 75, 47;
  --color-info-rgb: 98, 108, 113;

  /* Typography */
  --font-family-base: "FKGroteskNeue", "Geist", "Inter", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-mono: "Berkeley Mono", ui-monospace, SFMono-Regular, Menlo,
    Monaco, Consolas, monospace;
  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-md: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 20px;
  --font-size-3xl: 24px;
  --font-size-4xl: 30px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 550;
  --font-weight-bold: 600;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --letter-spacing-tight: -0.01em;

  /* Spacing */
  --space-0: 0;
  --space-1: 1px;
  --space-2: 2px;
  --space-4: 4px;
  --space-6: 6px;
  --space-8: 8px;
  --space-10: 10px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-base: 8px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.04),
    0 2px 4px -1px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04),
    0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.15),
    inset 0 -1px 0 rgba(0, 0, 0, 0.03);

  /* Animation */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: rgba(31, 33, 33, 1);
    --color-surface: rgba(38, 40, 40, 1);
    --color-text: rgba(245, 245, 245, 1);
    --color-text-secondary: rgba(167, 169, 169, 0.7);
    --color-primary: rgba(50, 184, 198, 1);
    --color-primary-hover: rgba(45, 166, 178, 1);
    --color-primary-active: rgba(41, 150, 161, 1);
    --color-secondary: rgba(119, 124, 124, 0.15);
    --color-secondary-hover: rgba(119, 124, 124, 0.25);
    --color-secondary-active: rgba(119, 124, 124, 0.3);
    --color-border: rgba(119, 124, 124, 0.3);
    --color-error: rgba(255, 84, 89, 1);
    --color-success: rgba(50, 184, 198, 1);
    --color-warning: rgba(230, 129, 97, 1);
    --color-info: rgba(167, 169, 169, 1);
    --color-focus-ring: rgba(50, 184, 198, 0.4);
    --color-btn-primary-text: rgba(19, 52, 59, 1);
    --color-card-border: rgba(119, 124, 124, 0.2);
    --color-card-border-inner: rgba(119, 124, 124, 0.15);
    --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
      inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    --button-border-secondary: rgba(119, 124, 124, 0.2);
    --color-border-secondary: rgba(119, 124, 124, 0.2);
    --color-select-caret: rgba(245, 245, 245, 0.8);

    /* Common style patterns - updated for dark mode */
    --focus-ring: 0 0 0 3px var(--color-focus-ring);
    --focus-outline: 2px solid var(--color-primary);
    --status-bg-opacity: 0.15;
    --status-border-opacity: 0.25;
    --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

    /* RGB versions for dark mode */
    --color-success-rgb: 50, 184, 198;
    --color-error-rgb: 255, 84, 89;
    --color-warning-rgb: 230, 129, 97;
    --color-info-rgb: 167, 169, 169;
  }
}

/* Data attribute for manual theme switching */
[data-color-scheme="dark"] {
  --color-background: rgba(31, 33, 33, 1);
  --color-surface: rgba(38, 40, 40, 1);
  --color-text: rgba(245, 245, 245, 1);
  --color-text-secondary: rgba(167, 169, 169, 0.7);
  --color-primary: rgba(50, 184, 198, 1);
  --color-primary-hover: rgba(45, 166, 178, 1);
  --color-primary-active: rgba(41, 150, 161, 1);
  --color-secondary: rgba(119, 124, 124, 0.15);
  --color-secondary-hover: rgba(119, 124, 124, 0.25);
  --color-secondary-active: rgba(119, 124, 124, 0.3);
  --color-border: rgba(119, 124, 124, 0.3);
  --color-error: rgba(255, 84, 89, 1);
  --color-success: rgba(50, 184, 198, 1);
  --color-warning: rgba(230, 129, 97, 1);
  --color-info: rgba(167, 169, 169, 1);
  --color-focus-ring: rgba(50, 184, 198, 0.4);
  --color-btn-primary-text: rgba(19, 52, 59, 1);
  --color-card-border: rgba(119, 124, 124, 0.15);
  --color-card-border-inner: rgba(119, 124, 124, 0.15);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
    inset 0 -1px 0 rgba(0, 0, 0, 0.15);
  --color-border-secondary: rgba(119, 124, 124, 0.2);
  --color-select-caret: rgba(245, 245, 245, 0.8);

  /* Common style patterns - updated for dark mode */
  --focus-ring: 0 0 0 3px var(--color-focus-ring);
  --focus-outline: 2px solid var(--color-primary);
  --status-bg-opacity: 0.15;
  --status-border-opacity: 0.25;
  --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

  /* RGB versions for dark mode */
  --color-success-rgb: 50, 184, 198;
  --color-error-rgb: 255, 84, 89;
  --color-warning-rgb: 230, 129, 97;
  --color-info-rgb: 167, 169, 169;
}

[data-color-scheme="light"] {
  --color-background: rgba(252, 252, 249, 1);
  --color-surface: rgba(255, 255, 253, 1);
  --color-text: rgba(19, 52, 59, 1);
  --color-text-secondary: rgba(98, 108, 113, 1);
  --color-primary: rgba(33, 128, 141, 1);
  --color-primary-hover: rgba(29, 116, 128, 1);
  --color-primary-active: rgba(26, 104, 115, 1);
  --color-secondary: rgba(94, 82, 64, 0.12);
  --color-secondary-hover: rgba(94, 82, 64, 0.2);
  --color-secondary-active: rgba(94, 82, 64, 0.25);
  --color-border: rgba(94, 82, 64, 0.2);
  --color-btn-primary-text: rgba(252, 252, 249, 1);
  --color-card-border: rgba(94, 82, 64, 0.12);
  --color-card-border-inner: rgba(94, 82, 64, 0.12);
  --color-error: rgba(192, 21, 47, 1);
  --color-success: rgba(33, 128, 141, 1);
  --color-warning: rgba(168, 75, 47, 1);
  --color-info: rgba(98, 108, 113, 1);
  --color-focus-ring: rgba(33, 128, 141, 0.4);

  /* RGB versions for light mode */
  --color-success-rgb: 33, 128, 141;
  --color-error-rgb: 192, 21, 47;
  --color-warning-rgb: 168, 75, 47;
  --color-info-rgb: 98, 108, 113;
}

/* Base styles */
html {
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  letter-spacing: var(--letter-spacing-tight);
}

h1 {
  font-size: var(--font-size-4xl);
}
h2 {
  font-size: var(--font-size-3xl);
}
h3 {
  font-size: var(--font-size-2xl);
}
h4 {
  font-size: var(--font-size-xl);
}
h5 {
  font-size: var(--font-size-lg);
}
h6 {
  font-size: var(--font-size-md);
}

p {
  margin: 0 0 var(--space-16) 0;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard);
}

a:hover {
  color: var(--color-primary-hover);
}

code,
pre {
  font-family: var(--font-family-mono);
  font-size: calc(var(--font-size-base) * 0.95);
  background-color: var(--color-secondary);
  border-radius: var(--radius-sm);
}

code {
  padding: var(--space-1) var(--space-4);
}

pre {
  padding: var(--space-16);
  margin: var(--space-16) 0;
  overflow: auto;
  border: 1px solid var(--color-border);
}

pre code {
  background: none;
  padding: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-base);
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1.5;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  border: none;
  text-decoration: none;
  position: relative;
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

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

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

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

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

.btn--secondary:hover {
  background: var(--color-secondary-hover);
}

.btn--secondary:active {
  background: var(--color-secondary-active);
}

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

.btn--outline:hover {
  background: var(--color-secondary);
}

.btn--sm {
  padding: var(--space-4) var(--space-12);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-sm);
}

.btn--lg {
  padding: var(--space-10) var(--space-20);
  font-size: var(--font-size-lg);
  border-radius: var(--radius-md);
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Form elements */
.form-control {
  display: block;
  width: 100%;
  padding: var(--space-8) var(--space-12);
  font-size: var(--font-size-md);
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  transition: border-color var(--duration-fast) var(--ease-standard),
    box-shadow var(--duration-fast) var(--ease-standard);
}

textarea.form-control {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
}

select.form-control {
  padding: var(--space-8) var(--space-12);
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: var(--select-caret-light);
  background-repeat: no-repeat;
  background-position: right var(--space-12) center;
  background-size: 16px;
  padding-right: var(--space-32);
}

/* Add a dark mode specific caret */
@media (prefers-color-scheme: dark) {
  select.form-control {
    background-image: var(--select-caret-dark);
  }
}

/* Also handle data-color-scheme */
[data-color-scheme="dark"] select.form-control {
  background-image: var(--select-caret-dark);
}

[data-color-scheme="light"] select.form-control {
  background-image: var(--select-caret-light);
}

.form-control:focus {
  border-color: var(--color-primary);
  outline: var(--focus-outline);
}

.form-label {
  display: block;
  margin-bottom: var(--space-8);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.form-group {
  margin-bottom: var(--space-16);
}

/* Card component */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--duration-normal) var(--ease-standard);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card__body {
  padding: var(--space-16);
}

.card__header,
.card__footer {
  padding: var(--space-16);
  border-bottom: 1px solid var(--color-card-border-inner);
}

/* Status indicators - simplified with CSS variables */
.status {
  display: inline-flex;
  align-items: center;
  padding: var(--space-6) var(--space-12);
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.status--success {
  background-color: rgba(
    var(--color-success-rgb, 33, 128, 141),
    var(--status-bg-opacity)
  );
  color: var(--color-success);
  border: 1px solid
    rgba(var(--color-success-rgb, 33, 128, 141), var(--status-border-opacity));
}

.status--error {
  background-color: rgba(
    var(--color-error-rgb, 192, 21, 47),
    var(--status-bg-opacity)
  );
  color: var(--color-error);
  border: 1px solid
    rgba(var(--color-error-rgb, 192, 21, 47), var(--status-border-opacity));
}

.status--warning {
  background-color: rgba(
    var(--color-warning-rgb, 168, 75, 47),
    var(--status-bg-opacity)
  );
  color: var(--color-warning);
  border: 1px solid
    rgba(var(--color-warning-rgb, 168, 75, 47), var(--status-border-opacity));
}

.status--info {
  background-color: rgba(
    var(--color-info-rgb, 98, 108, 113),
    var(--status-bg-opacity)
  );
  color: var(--color-info);
  border: 1px solid
    rgba(var(--color-info-rgb, 98, 108, 113), var(--status-border-opacity));
}

/* Container layout */
.container {
  width: 100%;
  margin-right: auto;
  margin-left: auto;
  padding-right: var(--space-16);
  padding-left: var(--space-16);
}

@media (min-width: 640px) {
  .container {
    max-width: var(--container-sm);
  }
}
@media (min-width: 768px) {
  .container {
    max-width: var(--container-md);
  }
}
@media (min-width: 1024px) {
  .container {
    max-width: var(--container-lg);
  }
}
@media (min-width: 1280px) {
  .container {
    max-width: var(--container-xl);
  }
}

/* Utility classes */
.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.items-center {
  align-items: center;
}
.justify-center {
  justify-content: center;
}
.justify-between {
  justify-content: space-between;
}
.gap-4 {
  gap: var(--space-4);
}
.gap-8 {
  gap: var(--space-8);
}
.gap-16 {
  gap: var(--space-16);
}

.m-0 {
  margin: 0;
}
.mt-8 {
  margin-top: var(--space-8);
}
.mb-8 {
  margin-bottom: var(--space-8);
}
.mx-8 {
  margin-left: var(--space-8);
  margin-right: var(--space-8);
}
.my-8 {
  margin-top: var(--space-8);
  margin-bottom: var(--space-8);
}

.p-0 {
  padding: 0;
}
.py-8 {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}
.px-8 {
  padding-left: var(--space-8);
  padding-right: var(--space-8);
}
.py-16 {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}
.px-16 {
  padding-left: var(--space-16);
  padding-right: var(--space-16);
}

.block {
  display: block;
}
.hidden {
  display: none;
}

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

:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

/* Dark mode specifics */
[data-color-scheme="dark"] .btn--outline {
  border: 1px solid var(--color-border-secondary);
}

@font-face {
  font-family: 'FKGroteskNeue';
  src: url('https://r2cdn.perplexity.ai/fonts/FKGroteskNeue.woff2')
    format('woff2');
}

/* Space Background Animation */
.space-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #0a0a1a 0%, #1a0a2e 50%, #16213e 100%);
    z-index: -1;
    overflow: hidden;
}

.stars {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, rgba(255,255,255,0.8), transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.6), transparent),
        radial-gradient(1px 1px at 90px 40px, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 130px 80px, rgba(255,255,255,0.7), transparent),
        radial-gradient(2px 2px at 160px 30px, rgba(255,255,255,0.5), transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: twinkle 4s linear infinite;
}

.moving-particles {
    position: absolute;
    width: 100%;
    height: 100%;
}

.moving-particles::before,
.moving-particles::after {
    content: '';
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(50, 184, 198, 0.6);
    border-radius: 50%;
    animation: float-particle 8s linear infinite;
}

.moving-particles::before {
    top: 20%;
    left: 10%;
    animation-delay: -2s;
}

.moving-particles::after {
    top: 60%;
    right: 15%;
    animation-delay: -4s;
    background: rgba(138, 43, 226, 0.6);
}

@keyframes twinkle {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes float-particle {
    0% { transform: translateY(100vh) scale(0); }
    10% { transform: translateY(90vh) scale(1); }
    90% { transform: translateY(-10vh) scale(1); }
    100% { transform: translateY(-20vh) scale(0); }
}

/* App Layout */
.app-container {
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

.app-header {
    padding: var(--space-16) 0;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(50, 184, 198, 0.3);
}

.logo h1 {
    color: #32b8c6;
    text-shadow: 0 0 20px rgba(50, 184, 198, 0.6);
    margin: 0;
    font-size: var(--font-size-3xl);
}

.tagline {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    display: block;
    margin-top: var(--space-4);
}

.user-stats {
    display: flex;
    gap: var(--space-24);
}

.stat-item {
    text-align: center;
    color: var(--color-text);
}

.stat-value {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: #32b8c6;
    text-shadow: 0 0 10px rgba(50, 184, 198, 0.4);
}

.stat-label {
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

/* Glow Text Effect */
.glow-text {
    color: #32b8c6;
    text-shadow: 0 0 20px rgba(50, 184, 198, 0.6);
}

/* Screen Management */
.screen {
    display: none;
    padding: var(--space-32) 0;
    min-height: calc(100vh - 120px);
}

.screen.active {
    display: block;
}

/* Home Screen Layout */
.home-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-32);
    align-items: center;
    min-height: 70vh;
}

/* Echo Light Character */
.character-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.echo-character {
    width: 300px;
    height: 300px;
    position: relative;
    animation: float 3s ease-in-out infinite;
}

.echo-character.mini {
    width: 150px;
    height: 150px;
}

.character-body {
    width: 100%;
    height: 100%;
    position: relative;
    background: linear-gradient(135deg, #32b8c6 0%, #8a2be2 100%);
    border-radius: 50%;
    box-shadow: 
        0 0 50px rgba(50, 184, 198, 0.4),
        inset 0 0 50px rgba(138, 43, 226, 0.2);
    animation: character-rotate 6s linear infinite;
}

.character-head {
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 60%;
}

.eyes {
    display: flex;
    justify-content: space-between;
    width: 60%;
    margin: 0 auto;
    padding-top: 20px;
}

.eye {
    width: 30px;
    height: 30px;
    background: white;
    border-radius: 50%;
    position: relative;
    animation: blink 4s infinite;
}

.pupil {
    width: 15px;
    height: 15px;
    background: #1a0a2e;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: eye-movement 3s ease-in-out infinite;
}

.mouth {
    width: 40px;
    height: 20px;
    background: #ff6b9d;
    border-radius: 0 0 40px 40px;
    position: absolute;
    bottom: 30%;
    left: 50%;
    transform: translateX(-50%);
    animation: mouth-talk 2s ease-in-out infinite;
}

.character-glow {
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    background: radial-gradient(circle, rgba(50, 184, 198, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    animation: glow-pulse 2s ease-in-out infinite alternate;
}

.sound-waves {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.sound-waves::before,
.sound-waves::after {
    content: '';
    position: absolute;
    border: 2px solid rgba(50, 184, 198, 0.4);
    border-radius: 50%;
    animation: sound-wave 2s ease-out infinite;
}

.sound-waves::before {
    width: 120%;
    height: 120%;
    top: -10%;
    left: -10%;
}

.sound-waves::after {
    width: 140%;
    height: 140%;
    top: -20%;
    left: -20%;
    animation-delay: 0.5s;
}

.light-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.light-particles::before,
.light-particles::after {
    content: '';
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 107, 157, 0.8);
    border-radius: 50%;
    animation: particle-orbit 4s linear infinite;
}

.light-particles::before {
    top: 20%;
    left: 20%;
}

.light-particles::after {
    bottom: 20%;
    right: 20%;
    animation-delay: 2s;
    background: rgba(138, 43, 226, 0.8);
}

/* Character Animations */
@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(2deg); }
}

@keyframes character-rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes blink {
    0%, 90%, 100% { transform: scaleY(1); }
    95% { transform: scaleY(0.1); }
}

@keyframes eye-movement {
    0%, 100% { transform: translate(-50%, -50%); }
    25% { transform: translate(-30%, -50%); }
    75% { transform: translate(-70%, -50%); }
}

@keyframes mouth-talk {
    0%, 100% { transform: translateX(-50%) scaleY(1); }
    50% { transform: translateX(-50%) scaleY(0.5); }
}

@keyframes glow-pulse {
    0% { opacity: 0.3; }
    100% { opacity: 0.7; }
}

@keyframes sound-wave {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(1.5); opacity: 0; }
}

@keyframes particle-orbit {
    0% { transform: rotate(0deg) translateX(150px) rotate(0deg); }
    100% { transform: rotate(360deg) translateX(150px) rotate(-360deg); }
}

/* Welcome Message */
.welcome-message {
    margin-top: var(--space-32);
    text-align: center;
    max-width: 400px;
}

.welcome-message p {
    color: var(--color-text);
    font-size: var(--font-size-lg);
    background: rgba(0, 0, 0, 0.3);
    padding: var(--space-16);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(50, 184, 198, 0.3);
}

/* Learning Modes */
.learning-modes {
    text-align: center;
}

.section-title {
    margin-bottom: var(--space-32);
    font-size: var(--font-size-3xl);
}

.modes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-24);
}

.mode-card {
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(50, 184, 198, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--space-24);
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-standard);
    text-align: center;
}

.mode-card:hover {
    transform: translateY(-5px);
    border-color: rgba(50, 184, 198, 0.6);
    box-shadow: 0 10px 30px rgba(50, 184, 198, 0.2);
}

.mode-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-16);
    display: block;
}

.mode-title {
    color: #32b8c6;
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-8);
}

.mode-description {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

/* Mode Headers */
.mode-header {
    display: flex;
    align-items: center;
    gap: var(--space-16);
    margin-bottom: var(--space-32);
    padding-bottom: var(--space-16);
    border-bottom: 1px solid rgba(50, 184, 198, 0.3);
}

.mode-header h2 {
    flex: 1;
    text-align: center;
    margin: 0;
}

.back-btn {
    background: rgba(0, 0, 0, 0.3) !important;
    border: 1px solid rgba(50, 184, 198, 0.3) !important;
    color: var(--color-text) !important;
}

/* Conversation Layout */
.conversation-layout {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-32);
    height: 60vh;
}

.character-side {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: var(--space-32);
}

.chat-area {
    display: flex;
    flex-direction: column;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(50, 184, 198, 0.3);
    overflow: hidden;
}

.chat-messages {
    flex: 1;
    padding: var(--space-16);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-12);
}

.message {
    max-width: 80%;
    padding: var(--space-12) var(--space-16);
    border-radius: var(--radius-lg);
    word-wrap: break-word;
}

.message.user {
    align-self: flex-end;
    background: linear-gradient(135deg, #32b8c6, #8a2be2);
    color: white;
}

.message.echo {
    align-self: flex-start;
    background: rgba(50, 184, 198, 0.1);
    border: 1px solid rgba(50, 184, 198, 0.3);
    color: var(--color-text);
}

.chat-input {
    display: flex;
    gap: var(--space-8);
    padding: var(--space-16);
    border-top: 1px solid rgba(50, 184, 198, 0.3);
}

.chat-input .form-control {
    flex: 1;
    background: rgba(0, 0, 0, 0.3);
    border-color: rgba(50, 184, 198, 0.3);
    color: var(--color-text);
}

.voice-btn {
    min-width: 50px;
}

/* Vocabulary Layout */
.vocabulary-layout {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-32);
    max-width: 600px;
    margin: 0 auto;
}

.progress-bar {
    width: 100%;
    height: 10px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #32b8c6, #8a2be2);
    border-radius: var(--radius-full);
    transition: width var(--duration-normal) var(--ease-standard);
    width: 0%;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--color-text);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
}

.flashcard {
    width: 400px;
    height: 250px;
    perspective: 1000px;
    cursor: pointer;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.flashcard.flipped .card-inner {
    transform: rotateY(180deg);
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(50, 184, 198, 0.3);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-16);
    padding: var(--space-24);
}

.card-back {
    transform: rotateY(180deg);
}

.card-front h3, .card-back h3 {
    color: #32b8c6;
    font-size: var(--font-size-3xl);
    margin: 0;
}

.card-controls {
    display: flex;
    gap: var(--space-16);
}

/* Pronunciation Layout */
.pronunciation-layout {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-32);
    max-width: 600px;
    margin: 0 auto;
}

.practice-word {
    text-align: center;
    background: rgba(0, 0, 0, 0.3);
    padding: var(--space-32);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(50, 184, 198, 0.3);
}

.practice-word h3 {
    color: #32b8c6;
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-16);
}

.recording-area {
    text-align: center;
}

.record-visualizer {
    width: 200px;
    height: 100px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(50, 184, 198, 0.3);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-16);
    position: relative;
    overflow: hidden;
}

.record-btn {
    font-size: var(--font-size-lg);
    padding: var(--space-16) var(--space-32);
}

.record-btn.recording {
    background: #ff6b9d !important;
    animation: pulse 1s infinite;
}

.pronunciation-feedback {
    width: 100%;
    padding: var(--space-16);
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(50, 184, 198, 0.3);
    text-align: center;
}

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

/* Grammar Layout */
.grammar-layout {
    max-width: 800px;
    margin: 0 auto;
}

.question-card {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(50, 184, 198, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--space-32);
    margin-bottom: var(--space-32);
}

.question-card h3 {
    color: var(--color-text);
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-24);
    text-align: center;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-16);
}

.option-btn {
    padding: var(--space-16);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(50, 184, 198, 0.3);
    color: var(--color-text);
    border-radius: var(--radius-base);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-standard);
}

.option-btn:hover {
    background: rgba(50, 184, 198, 0.1);
    border-color: rgba(50, 184, 198, 0.6);
}

.option-btn.correct {
    background: rgba(46, 160, 67, 0.2);
    border-color: #2ea043;
    color: #2ea043;
}

.option-btn.incorrect {
    background: rgba(218, 54, 51, 0.2);
    border-color: #da3633;
    color: #da3633;
}

.grammar-feedback {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(50, 184, 198, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--space-24);
    text-align: center;
}

/* Quick Actions */
.quick-actions {
    position: fixed;
    bottom: var(--space-24);
    right: var(--space-24);
    display: flex;
    flex-direction: column;
    gap: var(--space-12);
    z-index: 1000;
}

.quick-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(50, 184, 198, 0.3);
    color: var(--color-text);
    font-size: var(--font-size-xl);
    cursor: pointer;
    backdrop-filter: blur(10px);
    transition: all var(--duration-fast) var(--ease-standard);
}

.quick-btn:hover {
    background: rgba(50, 184, 198, 0.2);
    border-color: rgba(50, 184, 198, 0.6);
    transform: scale(1.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    .home-layout {
        grid-template-columns: 1fr;
        gap: var(--space-24);
        text-align: center;
    }
    
    .echo-character {
        width: 250px;
        height: 250px;
    }
    
    .modes-grid {
        grid-template-columns: 1fr;
    }
    
    .conversation-layout {
        grid-template-columns: 1fr;
        gap: var(--space-16);
    }
    
    .character-side {
        order: -1;
        padding-top: 0;
    }
    
    .flashcard {
        width: 100%;
        max-width: 350px;
    }
    
    .user-stats {
        gap: var(--space-16);
    }
    
    .quick-actions {
        bottom: var(--space-16);
        right: var(--space-16);
    }
    
    .quick-btn {
        width: 50px;
        height: 50px;
        font-size: var(--font-size-lg);
    }
}

/* Additional Styles for Scenarios */
.scenarios-layout {
    max-width: 800px;
    margin: 0 auto;
}

.scenario-selector {
    margin-bottom: var(--space-32);
}

.scenario-buttons {
    display: flex;
    gap: var(--space-16);
    flex-wrap: wrap;
    justify-content: center;
}

.scenario-btn {
    padding: var(--space-12) var(--space-24);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(50, 184, 198, 0.3);
    color: var(--color-text);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-standard);
}

.scenario-btn:hover, .scenario-btn.active {
    background: rgba(50, 184, 198, 0.2);
    border-color: rgba(50, 184, 198, 0.6);
}

.scenario-dialogue {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(50, 184, 198, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--space-24);
}

.dialogue-line {
    margin-bottom: var(--space-16);
    padding: var(--space-12);
    border-radius: var(--radius-base);
}

.dialogue-line.waiter, .dialogue-line.interviewer {
    background: rgba(50, 184, 198, 0.1);
    border-left: 3px solid #32b8c6;
}

.dialogue-line.customer, .dialogue-line.candidate {
    background: rgba(138, 43, 226, 0.1);
    border-left: 3px solid #8a2be2;
    margin-left: var(--space-24);
}

/* Daily Challenge Styles */
.daily-layout {
    max-width: 600px;
    margin: 0 auto;
}

.challenge-header {
    text-align: center;
    margin-bottom: var(--space-32);
}

.challenge-timer {
    font-size: var(--font-size-3xl);
    color: #ff6b9d;
    font-weight: var(--font-weight-bold);
    text-shadow: 0 0 10px rgba(255, 107, 157, 0.4);
}

.challenge-content {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(50, 184, 198, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--space-32);
    margin-bottom: var(--space-32);
    text-align: center;
}

.challenge-sentence {
    font-size: var(--font-size-xl);
    color: #32b8c6;
    margin: var(--space-24) 0;
}

.word-bank {
    display: flex;
    gap: var(--space-12);
    justify-content: center;
    flex-wrap: wrap;
}

.word-option {
    padding: var(--space-8) var(--space-16);
    background: rgba(138, 43, 226, 0.2);
    border: 1px solid #8a2be2;
    color: #8a2be2;
    border-radius: var(--radius-base);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-standard);
}

.word-option:hover {
    background: rgba(138, 43, 226, 0.3);
    transform: translateY(-2px);
}

.word-option.selected {
    background: #8a2be2;
    color: white;
}

/* Progress Screen Styles */
.progress-layout {
    max-width: 800px;
    margin: 0 auto;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-24);
    margin-bottom: var(--space-32);
}

.stat-card {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(50, 184, 198, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--space-24);
    text-align: center;
}

.stat-card h3 {
    color: var(--color-text);
    margin-bottom: var(--space-16);
    font-size: var(--font-size-lg);
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: #32b8c6;
    text-shadow: 0 0 10px rgba(50, 184, 198, 0.4);
}

.achievements-section h3 {
    color: #32b8c6;
    margin-bottom: var(--space-24);
    text-align: center;
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-16);
}

.achievement-card {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(50, 184, 198, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--space-16);
    text-align: center;
    opacity: 0.5;
    transition: all var(--duration-fast) var(--ease-standard);
}

.achievement-card.unlocked {
    opacity: 1;
    border-color: rgba(255, 215, 0, 0.6);
    box-shadow: 0 0 20px rgba(255, 215, 0, 0.2);
}

.achievement-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-8);
    display: block;
}

.achievement-name {
    color: #32b8c6;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-4);
}

.achievement-description {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}