/* ============================================
   BASE – Reset, typography, layout, animations
   ============================================ */

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

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
    color-scheme: light dark;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ---- Layout utilities ---- */
main {
    flex: 1;
    width: 100%;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.container--wide {
    max-width: var(--max-width-wide);
}

.section {
    padding: var(--space-16) var(--space-4);
}

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

/* ---- Skip to content – accessibility ---- */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    background: var(--color-primary);
    color: #fff;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-sm);
    z-index: 1000;
    font-size: var(--font-size-sm);
    text-decoration: none;
    font-weight: 500;
}

.skip-link:focus {
    top: var(--space-2);
}

/* ---- Headings ---- */
h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    line-height: var(--line-height-tight);
    letter-spacing: var(--letter-spacing-tight);
    margin-bottom: var(--space-3);
}

h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: var(--letter-spacing-tight);
    margin-bottom: var(--space-2);
}

h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

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

/* ---- Links ---- */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

/* ---- Focus visible ---- */
:focus-visible {
    outline: 2px solid var(--color-border-focus);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ---- Selection ---- */
::selection {
    background: var(--color-primary);
    color: #fff;
}

/* ---- Screen reader only ---- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ---- Gradient text utility ---- */
.gradient-text {
    background: linear-gradient(135deg, var(--color-accent-start), var(--color-accent-end));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ---- Animations ---- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.animate-in {
    animation: fadeInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    opacity: 0;
}

.animate-in--delay-1 {
    animation-delay: 0.1s;
}

.animate-in--delay-2 {
    animation-delay: 0.2s;
}

.animate-in--delay-3 {
    animation-delay: 0.3s;
}

/* Scroll reveal — elements start hidden, revealed by JS */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}