:root {
  /* Color Palette */
  --color-primary: #667eea;
  --color-secondary: #764ba2;
  --color-background-dark: #0a0a0f;
  --color-text-dark: #2d3748;
  --color-text-medium: #4a5568;
  --color-text-light: #718096;
  --color-text-lighter: #a0aec0;
  --color-white: #ffffff;
  --color-border: #e2e8f0;
  --color-glow-1: rgba(102, 126, 234, 0.3);
  --color-glow-2: rgba(118, 75, 162, 0.3);

  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 16px;
  --spacing-lg: 20px;
  --spacing-xl: 24px;
  --spacing-2xl: 30px;
  --spacing-3xl: 40px;
  --spacing-4xl: 50px;
  --spacing-5xl: 60px;

  /* Border Radius */
  --radius-sm: 12px;
  --radius-md: 16px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  --font-size-xs: 13px;
  --font-size-sm: 14px;
  --font-size-base: 15px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 26px;
  --font-size-4xl: 28px;
  --font-size-5xl: 32px;
  --font-size-6xl: 48px;
  --font-size-7xl: 64px;

  /* Shadows */
  --shadow-card: 0 20px 60px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 8px 20px rgba(102, 126, 234, 0.4);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.5s ease-in;
}

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

body {
  font-family: var(--font-family);
  background: var(--color-background-dark);
  min-height: 100vh;
  padding: var(--spacing-4xl) var(--spacing-3xl);
  position: relative;
  overflow-x: hidden;
}

/* Mouse-interactive Glow Elements */
.glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.7;
  z-index: 0;
  pointer-events: none;
  will-change: transform;
}

.glow--1 {
  width: 700px;
  height: 700px;
  background: var(--color-glow-1);
  top: 0;
  left: 0;
}

.glow--2 {
  width: 600px;
  height: 600px;
  background: var(--color-glow-2);
  top: 0;
  left: 0;
}

/* Page Block */
.page {
  max-width: 1400px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.page__header {
  margin-bottom: var(--spacing-5xl);
}

/* Branding Block */
.branding {
  text-align: left;
}

.branding__title {
  font-size: var(--font-size-7xl);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--spacing-sm);
  line-height: 1.1;
}

.branding__tagline {
  font-size: var(--font-size-xl);
  color: var(--color-white);
  opacity: 0.9;
  font-weight: 400;
}

/* Card Block */
.card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  animation: fadeIn var(--transition-medium);
  max-width: 600px;
  margin: 0 auto;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card__content {
  padding: var(--spacing-3xl);
}

.card__title {
  font-size: var(--font-size-2xl);
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-2xl);
  font-weight: 600;
  line-height: 1.4;
  max-width: 500px;
}

/* Gradient Text */
.gradient-text {
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

/* View Block */
.view {
  display: block;
}

.view--hidden {
  display: none;
}

/* Form View Block */
.form-view__container {
  min-height: 200px;
}

/* Split Screen Block */
.split-screen {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  min-height: 450px;
  position: relative;
  z-index: 1;
}

.split-screen__panel {
  display: grid;
  grid-template-rows: auto 1fr;
  align-items: start;
  justify-items: center;
  padding: var(--spacing-5xl) var(--spacing-5xl);
  text-decoration: none;
  color: var(--color-white);
  position: relative;
  overflow: hidden;
  background: rgba(10, 10, 15, 0.4);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.split-screen__content {
  display: grid;
  grid-template-rows: subgrid;
  grid-row: span 2;
  position: relative;
  z-index: 1;
  text-align: center;
  width: 100%;
}

.split-screen__title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
  align-self: start;
  margin-bottom: var(--spacing-3xl);
}

.split-screen__description {
  font-size: var(--font-size-lg);
  color: var(--color-text-lighter);
  opacity: 0.8;
}

.split-screen__hint {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  opacity: 0.9;
  margin-top: var(--spacing-sm);
  font-weight: 500;
}

.split-screen__divider {
  width: 2px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(102, 126, 234, 0.3) 20%,
    rgba(118, 75, 162, 0.5) 50%,
    rgba(102, 126, 234, 0.3) 80%,
    transparent 100%
  );
  position: relative;
  z-index: 2;
}

.split-screen__divider::before {
  content: "OR";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--color-background-dark);
  color: var(--color-text-lighter);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 2px;
  border: 2px solid rgba(102, 126, 234, 0.3);
  border-radius: 20px;
  z-index: 2;
}

/* Button Stack Block */
.button-stack {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  width: 100%;
}

/* Button Block */
.button {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-xl);
  text-decoration: none;
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 2px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  min-height: 50px;
}

.button::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-secondary) 100%
  );
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: 0;
}

.button:hover::before {
  opacity: 0.2;
}

.button:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 12px 30px rgba(102, 126, 234, 0.3);
}

.button:active {
  transform: translateY(-2px);
}

.button__label {
  font-size: var(--font-size-md);
  font-weight: 700;
  color: var(--color-white);
  position: relative;
  z-index: 1;
}

/* Button Variants */
.button--primary .button__label {
  color: var(--color-white);
}

.button--secondary .button__label {
  color: var(--color-white);
}

/* Responsive */
@media (max-width: 1024px) {
  .split-screen {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    min-height: auto;
  }

  .split-screen__panel {
    padding: var(--spacing-4xl) var(--spacing-3xl);
  }

  .split-screen__panel--desktop-only,
  .split-screen__divider--desktop-only {
    display: none;
  }

  .split-screen__title {
    margin-bottom: var(--spacing-5xl);
  }

  .split-screen__divider {
    width: 100%;
    height: 2px;
    background: linear-gradient(
      to right,
      transparent 0%,
      rgba(102, 126, 234, 0.3) 20%,
      rgba(118, 75, 162, 0.5) 50%,
      rgba(102, 126, 234, 0.3) 80%,
      transparent 100%
    );
  }
}

/* Responsive */
@media (max-width: 768px) {
  body {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }

  .page__header {
    margin-bottom: var(--spacing-3xl);
  }

  .branding__title {
    font-size: var(--font-size-5xl);
  }

  .branding__tagline {
    font-size: var(--font-size-md);
  }

  .card__content {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }

  .card__title {
    font-size: var(--font-size-xl);
  }

  .split-screen__panel {
    padding: var(--spacing-3xl) var(--spacing-lg);
  }

  .button-stack {
    gap: var(--spacing-sm);
    max-width: 100%;
  }

  .button {
    padding: var(--spacing-sm) var(--spacing-md);
    min-height: 45px;
  }

  .button__label {
    font-size: var(--font-size-sm);
  }
}