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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-height) + 1rem);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a:hover {
    color: #79c0ff;
}

code, pre {
    font-family: var(--font-mono);
}

img, svg {
    max-width: 100%;
}

/* === Layout === */
.landing {
    min-height: 100vh;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
    padding: 0 1rem;
}

/* === Section dividers === */
.section + .section {
    border-top: 1px solid var(--border-muted);
}

/* === Section Titles === */
.section-title {
    font-size: 2.75rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 3.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-default);
    font-family: var(--font-sans);
    text-decoration: none;
    line-height: 1.4;
    position: relative;
    isolation: isolate;
}

.btn-primary {
    background: var(--gradient-brand);
    color: white;
    box-shadow: var(--shadow-md), 0 0 0 0 rgba(49, 120, 198, 0);
}

.btn-primary:hover {
    background: var(--gradient-brand-hover);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(49, 120, 198, 0.2);
    transform: translateY(-2px);
    color: white;
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
}

.btn-secondary:hover {
    background: var(--border-default);
    border-color: var(--text-secondary);
    transform: translateY(-2px);
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

.btn-secondary:active {
    transform: translateY(0);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
}

/* === Cards === */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: var(--border-radius-lg);
    padding: 1.75rem;
    transition: all var(--transition-default);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: inherit;
    background: linear-gradient(135deg, rgba(49, 120, 198, 0.3), rgba(104, 33, 122, 0.3));
    opacity: 0;
    transition: opacity var(--transition-default);
    z-index: -1;
    mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    mask-composite: exclude;
    -webkit-mask-composite: xor;
    padding: 1px;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.card:hover::before {
    opacity: 1;
}

/* === Code Blocks === */
.code-block {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    position: relative;
    transition: all var(--transition-default);
}

.code-block:hover {
    border-color: rgba(88, 166, 255, 0.2);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.code-block__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.625rem 1rem;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-default);
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.code-block__content {
    padding: 1.25rem;
    overflow-x: auto;
    font-size: 0.875rem;
    line-height: 1.7;
}

.code-block__content pre {
    margin: 0;
    background: transparent !important;
    padding: 0 !important;
}

.code-block__content code {
    background: transparent !important;
    font-size: 0.875rem;
}

/* === Copy Button === */
.copy-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
    font-family: var(--font-sans);
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
    background: var(--border-default);
}

.copy-btn.copied {
    color: var(--accent-green);
    border-color: var(--accent-green);
}

/* === Badges === */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.1875rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 999px;
    border: 1px solid transparent;
}

.badge-green {
    background: rgba(63, 185, 80, 0.1);
    color: var(--accent-green);
    border-color: rgba(63, 185, 80, 0.2);
}

.badge-yellow {
    background: rgba(210, 153, 34, 0.1);
    color: var(--accent-yellow);
    border-color: rgba(210, 153, 34, 0.2);
}

.badge-red {
    background: rgba(248, 81, 73, 0.1);
    color: var(--accent-red);
    border-color: rgba(248, 81, 73, 0.2);
}

/* === Tabs === */
.tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--border-default);
    margin-bottom: 0;
    overflow-x: auto;
    scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
    display: none;
}

.tab {
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    font-family: var(--font-sans);
    position: relative;
}

.tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
}

.tab.active {
    color: var(--accent-neon);
    border-bottom-color: var(--accent-neon);
}

/* === Scroll animations === */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* === Gradient text === */
.gradient-text {
    background: var(--gradient-brand-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* === Section alternating backgrounds === */
.section--alt {
    background: var(--bg-secondary);
}

/* === Responsive === */
@media (max-width: 768px) {
    :root {
        --section-padding: 4rem 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .section-subtitle {
        font-size: 1rem;
        margin-bottom: 2.5rem;
    }

    .container {
        padding: 0 0.5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    :root {
        --section-padding: 5rem 1.5rem;
    }

    .section-title {
        font-size: 2.25rem;
    }
}