:root {
  --color-surface-bg: #FFFFFF;
  --color-surface-card: #F7F8FA;
  --color-gradient-primary: linear-gradient(90deg, #FF7A5A 0%, #FFD84E 35%, #43E97B 65%, #38A1DB 100%);
  --color-gradient-secondary: linear-gradient(90deg, #B86ADF 0%, #FF7A5A 50%, #FFD84E 100%);
  --color-text-primary: #23272F;
  --color-text-secondary: #6B7280;
  --color-text-on-gradient: #FFFFFF;
  --color-border: #E3E6ED;
  --color-focus: #38A1DB;
  --color-error: #FF4E4E;

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

  --fs-1: clamp(2rem, 4vw, 2.8rem);
  --fs-2: clamp(1.8rem, 3vw, 2.2rem);
  --fs-3: clamp(1.4rem, 2.5vw, 1.6rem);
  --fs-4: 1.2rem;
  --fs-5: 1rem;
  --fs-6: 0.9rem;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 2rem;
  --space-4: 3rem;
  --space-5: 4rem;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-full: 50%;

  --shadow-soft: 0 2px 12px rgba(67,233,123,0.07);

  --container-max: 1200px;
  --container-pad: 2rem;
}

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

* {
  margin: 0;
}

html {
  font-family: var(--font-body);
  color: var(--color-text-primary);
  background: var(--color-surface-bg);
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  border-radius: var(--radius-md);
}

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

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

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

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  line-height: 1.3;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

h1 { font-size: var(--fs-1); }
h2 { font-size: var(--fs-2); }
h3 { font-size: var(--fs-3); }
h4 { font-size: var(--fs-4); }
h5 { font-size: var(--fs-5); }
h6 { font-size: var(--fs-6); }

p {
  font-size: var(--fs-5);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

small {
  font-size: var(--fs-6);
  color: var(--color-text-secondary);
}

ul,
ol {
  padding-left: 1.2rem;
  margin-bottom: var(--space-2);
}

blockquote {
  margin-bottom: var(--space-3);
  padding-left: var(--space-2);
  border-left: 3px solid var(--color-border);
  color: var(--color-text-secondary);
}

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

.section {
  padding-block: var(--space-5);
}

.surface-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  padding: var(--space-3);
}

.flow > * + * {
  margin-top: var(--space-2);
}

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

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  background: var(--color-gradient-primary);
  color: var(--color-text-on-gradient);
  transition: filter 0.2s ease, transform 0.1s ease;
}

.btn:hover {
  filter: brightness(1.05);
}

.btn:active {
  transform: translateY(1px);
}

.link {
  position: relative;
}

.link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--color-gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.link:hover::after,
.link:focus-visible::after {
  transform: scaleX(1);
}

input,
textarea,
select {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface-bg);
}

input:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 1px;
}

input.error,
textarea.error,
select.error {
  border-color: var(--color-error);
}

label {
  display: block;
  margin-bottom: 0.25rem;
  font-size: var(--fs-6);
  color: var(--color-text-secondary);
}

form > * + * {
  margin-top: var(--space-2);
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin-block: var(--space-3);
}

@media (max-width: 768px) {
  :root {
    --container-pad: 1rem;
  }

  .section {
    padding-block: var(--space-4);
  }
}