/* ========================================
   BASE — Reset + Global Typography
   ======================================== */
/* Font loaded via HTML link tag with font-display=swap */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-family);
    font-size: var(--fs-body);
    font-weight: var(--fw-regular);
    line-height: var(--lh-body);
    color: var(--color-text-dark);
    background: var(--color-white);
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: var(--fw-bold);
    line-height: var(--lh-heading);
    letter-spacing: var(--ls-tight);
    color: var(--color-text-primary);
}

h1 {
    font-size: var(--fs-h1);
}

h2 {
    font-size: var(--fs-h2);
    font-weight: var(--fw-extrabold);
}

h3 {
    font-size: var(--fs-h3);
}

p {
    color: var(--color-text-secondary);
    line-height: var(--lh-body);
}

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

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

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

ul,
ol {
    list-style: none;
}

/* ---- Container ---- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.container-wide {
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ---- Section ---- */
.section {
    padding: var(--section-padding);
    position: relative;
}

.section-dark {
    background: var(--color-dark);
    color: var(--color-white);
}

.section-dark h2,
.section-dark h3,
.section-dark h4 {
    color: var(--color-white);
}

.section-dark p {
    color: rgba(255, 255, 255, 0.6);
}

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

/* ---- Section Title ---- */
.section-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.section-header h2 {
    margin-bottom: var(--space-sm);
}

.section-header .subtitle {
    font-size: var(--fs-body-lg);
    color: var(--color-text-secondary);
    font-weight: var(--fw-regular);
    max-width: 600px;
    margin: 0 auto;
}

/* ---- Scroll Animations ---- */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.25, 0.1, 0.25, 1),
        transform 0.8s cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

.reveal-delay-1 {
    transition-delay: 0.1s;
}

.reveal-delay-2 {
    transition-delay: 0.2s;
}

.reveal-delay-3 {
    transition-delay: 0.3s;
}

.reveal-delay-4 {
    transition-delay: 0.4s;
}

/* Scale-in animation */
.reveal-scale {
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal-scale.visible {
    opacity: 1;
    transform: scale(1);
}

/* ---- Selection ---- */
::selection {
    background: var(--color-accent);
    color: var(--color-white);
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--color-dark-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}