:root {
  --color-bg: #FAFAFF;
  --color-surface: #FFFFFF;
  --color-primary-gradient: linear-gradient(90deg, #6A5BFF 0%, #5BFFB9 100%);
  --color-secondary-gradient: linear-gradient(90deg, #FFB95B 0%, #FF5B8B 100%);
  --color-text-primary: #23243A;
  --color-text-secondary: #4B4D5A;
  --color-text-on-accent: #FFFFFF;
  --color-border: #E2E4F0;
  --color-success: #38D996;
  --color-error: #FF5B8B;

  --font-heading: 'Montserrat', 'Segoe UI', Arial, sans-serif;
  --font-body: 'Inter', 'Segoe UI', Arial, sans-serif;

  --fs-1: clamp(2.3rem, 3vw, 3.2rem);
  --fs-2: clamp(1.7rem, 2.5vw, 2.4rem);
  --fs-3: clamp(1.3rem, 2vw, 1.8rem);
  --fs-4: 1.1rem;
  --fs-5: 1rem;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;

  --container-max: 1200px;
  --container-pad-mobile: 16px;
  --container-pad-desktop: 32px;

  --radius-sm: 12px;
  --radius-lg: 24px;

  --shadow-soft: 0 2px 8px rgba(90,100,160,0.06);

  --transition-fast: 0.2s ease;
}

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

* {
  margin: 0;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--fs-5);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

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

p {
  margin-block-end: var(--space-4);
  color: var(--color-text-secondary);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  color: var(--color-text-primary);
  letter-spacing: 0.01em;
  line-height: 1.2;
  margin-block-end: var(--space-3);
}

h1 { font-size: var(--fs-1); }
h2 { font-size: var(--fs-2); }
h3 { font-size: var(--fs-3); }
h4 { font-size: var(--fs-4); }

ul,
ol {
  padding-left: 1.2em;
  margin-block-end: var(--space-4);
}

blockquote {
  margin-block-end: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-left: 3px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius-sm);
}

section {
  padding-block: var(--space-6);
}

@media (min-width: 768px) {
  section {
    padding-block: var(--space-7);
  }
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad-mobile);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--container-pad-desktop);
  }
}

.surface {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-soft);
}

.surface-lg {
  border-radius: var(--radius-lg);
}

.stack > * + * {
  margin-top: var(--space-3);
}

.stack-lg > * + * {
  margin-top: var(--space-5);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  min-width: 0;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  min-width: 0;
}

.row > * {
  min-width: 0;
  flex: 1 1 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.7em 1.4em;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: var(--fs-5);
  line-height: 1.2;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}

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

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

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
  filter: brightness(1.05);
}

.btn:focus-visible {
  outline: 2px solid #6A5BFF;
  outline-offset: 2px;
}

.input,
textarea,
select {
  width: 100%;
  padding: 0.7em 1em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: #6A5BFF;
  box-shadow: 0 0 0 2px rgba(106,91,255,0.15);
}

.label {
  display: block;
  font-size: 0.9rem;
  margin-bottom: var(--space-1);
  color: var(--color-text-secondary);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.card {
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-soft);
}

.card > *:last-child {
  margin-bottom: 0;
}

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

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

.link {
  color: #6A5BFF;
  transition: color var(--transition-fast);
}

.link:hover {
  color: #5BFFB9;
}

.hr {
  height: 1px;
  background: var(--color-border);
  border: none;
  margin-block: var(--space-5);
}