/* Base Reset */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: var(--line-height);
    font-size: var(--body-size);
    transition: background-color var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(2.5rem, 5vw, var(--h1-size));
}

h2 {
    font-size: clamp(2rem, 4vw, var(--h2-size));
    background: linear-gradient(135deg, #c607b3, #eb5074);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.3;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-base);
}

a,
button,
.flip-card,
.pain-card,
.accordion-header {
    -webkit-tap-highlight-color: transparent;
}

ul {
    list-style: none;
}

img,
video {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Utilities */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: var(--section-padding);
}

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