/* =========================================
   1. DESIGN TOKENS (Minimalism)
   ========================================= */
:root {
    /* Brand */
    --klein-blue: #002FA7;
    --klein-blue-text: var(--klein-blue);
    --pure-black: #000000;
    --pure-white: #ffffff;
    --pale-silver: #F8F9FB;

    /* Theme — Light */
    --bg-primary: var(--pale-silver);
    --bg-secondary: var(--pure-white);
    --text-primary: var(--pure-black);
    --text-secondary: rgba(0, 0, 0, 0.4);
    --border-color: rgba(0, 0, 0, 0.08);
    --deep-navy: #020412;

    /* Easing */
    --mi-smooth: cubic-bezier(0.32, 0.72, 0, 1);

    /* Zensical / Material overrides */
    --md-primary-fg-color: var(--klein-blue);
    --md-primary-fg-color--light: #3B6DFF;
    --md-default-bg-color: var(--bg-primary);
}

/* =========================================
   2. DARK MODE
   ========================================= */
[data-md-color-scheme="slate"] {
    --bg-primary: #161819;
    --bg-secondary: #191919;
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.4);
    --border-color: rgba(255, 255, 255, 0.08);
    --klein-blue-text: #5B8DEF;

    --md-default-bg-color: var(--bg-primary);
    --md-default-fg-color: var(--text-primary);
    --md-primary-fg-color: #5B8DEF;
}

/* =========================================
   3. BASE & TYPOGRAPHY
   ========================================= */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 6rem;
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
}

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-family: "Inter", sans-serif;
    letter-spacing: -0.02em;
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

/* Headings — Inter with tight tracking */
h1, .md-typeset h1 {
    font-family: "Inter", sans-serif !important;
    font-weight: 500;
    letter-spacing: -0.06em;
    line-height: 1;
}

h2, .md-typeset h2,
h3, .md-typeset h3,
h4, .md-typeset h4 {
    font-family: "Inter", sans-serif !important;
    font-weight: 500;
    letter-spacing: -0.04em;
}

h5, .md-typeset h5,
h6, .md-typeset h6 {
    font-family: "Inter", sans-serif !important;
    font-weight: 500;
    letter-spacing: -0.02em;
}

/* Site Title */
.md-header__title,
.md-header__topic {
    font-family: "Inter", sans-serif !important;
    font-weight: 500 !important;
    letter-spacing: -0.04em;
}

/* Code */
code, kbd, pre {
    font-family: "JetBrains Mono", monospace;
}

/* =========================================
   4. HEADER — Refined Minimalism
   ========================================= */
.md-header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

[data-md-color-scheme="slate"] .md-header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

/* Site title — Klein Blue accent */
.md-header__topic {
    color: var(--klein-blue-text) !important;
}

/* Header buttons — Klein Blue hover */
.md-header__button:hover {
    color: var(--klein-blue-text);
    opacity: 1;
}

/* =========================================
   4b. NAVIGATION TABS — Klein Blue accent
   ========================================= */
.md-tabs {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.md-tabs__link {
    font-weight: 500;
    letter-spacing: -0.02em;
}

.md-tabs__item--active .md-tabs__link {
    color: var(--klein-blue-text);
}

.md-tabs__link:hover {
    color: var(--klein-blue-text);
}

/* =========================================
   5. CONTENT CARDS — Flat with faint borders
   ========================================= */
.md-typeset .admonition,
.md-typeset details {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

[data-md-color-scheme="slate"] .md-typeset .admonition,
[data-md-color-scheme="slate"] .md-typeset details {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

/* =========================================
   6. SIDEBAR — Clean, solid
   ========================================= */
.md-sidebar--secondary,
.md-nav--secondary,
.md-nav--secondary .md-nav__title {
    background: transparent !important;
    box-shadow: none !important;
}

/* =========================================
   7. FOOTER LINKS
   ========================================= */
.md-footer__link {
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
    transition: opacity 0.2s var(--mi-smooth);
}

.md-footer__link:hover {
    background: transparent;
    transform: none;
    box-shadow: none;
    opacity: 0.7;
}

.md-footer__title {
    font-family: "Inter", sans-serif !important;
    font-weight: 500 !important;
    font-size: 1.1rem;
    letter-spacing: -0.04em;
}

.md-footer__direction {
    font-family: "JetBrains Mono", monospace !important;
    font-size: 0.75rem;
    opacity: 0.6;
    margin-bottom: 0.5rem;
}

/* =========================================
   8. SPACING
   ========================================= */
.md-main__inner {
    margin-top: 1rem;
}

/* =========================================
   9. FOOTER KLEIN BLUE BANNER
   ========================================= */
.md-footer-klein-banner {
    background-color: var(--klein-blue);
    color: var(--pure-white);
    padding: 2rem 0;
}

.md-footer-klein-banner__text {
    font-family: "Inter", sans-serif;
    font-size: clamp(3rem, 8vw, 10rem);
    font-weight: 900;
    letter-spacing: -0.05em;
    line-height: 1;
    text-align: left;
}