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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: var(--fs-base);
    line-height: 1.6;
    color: var(--text-light);
    background-color: var(--bg-dark);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

ul, ol {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: var(--fw-bold);
    line-height: 1.2;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

.section {
    padding: 3rem 0;
}

.section--dark {
    background-color: var(--bg-dark);
    color: var(--text-light);
}

.section--dark-alt {
    background-color: var(--bg-dark-alt);
    color: var(--text-light);
}

.section--light {
    background-color: var(--bg-light);
    color: var(--text-dark);
}

.section-header {
    margin-bottom: 2.5rem;
}

.section-title {
    font-size: var(--fs-2xl);
    font-weight: var(--fw-extrabold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding-left: 1rem;
    border-left: 4px solid var(--accent);
}

.section-subtitle {
    font-size: var(--fs-base);
    color: var(--text-muted);
    margin-top: 0.5rem;
    padding-left: 1.25rem;
}

.section--light .section-subtitle {
    color: var(--text-dark-muted);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-family: var(--font-heading);
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    border: 2px solid var(--accent);
    color: var(--text-light);
    background-color: transparent;
    transition: all var(--transition);
    cursor: pointer;
}

.btn:hover {
    background-color: var(--accent);
    color: var(--text-light);
}

.btn--filled {
    background-color: var(--accent);
    color: var(--text-light);
}

.btn--filled:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
}

.btn--dark {
    border-color: var(--text-dark);
    color: var(--text-dark);
}

.btn--dark:hover {
    background-color: var(--text-dark);
    color: var(--text-light);
}

.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;
}

.animate-fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-fade-up.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-slide-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.animate-slide-left.is-visible {
    opacity: 1;
    transform: translateX(0);
}

.animate-scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-scale-in.is-visible {
    opacity: 1;
    transform: scale(1);
}

.scroll-top-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background-color: var(--accent);
    color: var(--text-light);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-scroll-top);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    cursor: pointer;
}

.scroll-top-btn.is-visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top-btn:hover {
    background-color: var(--accent-hover);
}

.scroll-top-btn svg {
    width: 24px;
    height: 24px;
}

@media (min-width: 768px) {
    .section {
        padding: 4rem 0;
    }

    .section-title {
        font-size: var(--fs-3xl);
    }

    .section-header {
        margin-bottom: 3rem;
    }
}

@media (min-width: 1024px) {
    .section {
        padding: 5rem 0;
    }

    .section-title {
        font-size: var(--fs-4xl);
    }
}