/* ==========================================================================
   Custom Font: BasierSquareMono
   ========================================================================== */

@font-face {
    font-family: 'BasierSquareMono';
    src: url('../fonts/BasierSquareMono-Regular.otf') format('opentype');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'BasierSquareMono';
    src: url('../fonts/BasierSquareMono-RegularItalic.otf') format('opentype');
    font-weight: 400;
    font-style: italic;
    font-display: swap;
}

@font-face {
    font-family: 'BasierSquareMono';
    src: url('../fonts/BasierSquareMono-Medium.otf') format('opentype');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'BasierSquareMono';
    src: url('../fonts/BasierSquareMono-MediumItalic.otf') format('opentype');
    font-weight: 500;
    font-style: italic;
    font-display: swap;
}

@font-face {
    font-family: 'BasierSquareMono';
    src: url('../fonts/BasierSquareMono-SemiBold.otf') format('opentype');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'BasierSquareMono';
    src: url('../fonts/BasierSquareMono-SemiBoldItalic.otf') format('opentype');
    font-weight: 600;
    font-style: italic;
    font-display: swap;
}

@font-face {
    font-family: 'BasierSquareMono';
    src: url('../fonts/BasierSquareMono-Bold.otf') format('opentype');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'BasierSquareMono';
    src: url('../fonts/BasierSquareMono-BoldItalic.otf') format('opentype');
    font-weight: 700;
    font-style: italic;
    font-display: swap;
}

/* ==========================================================================
   Design Tokens
   ========================================================================== */

:root {
    /* Typography - BasierSquareMono with monospace fallbacks */
    --font-family: 'BasierSquareMono', 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Source Code Pro', monospace;
    
    /* Font Weights - Mapped to BasierSquareMono styles */
    --font-weight-regular: 400;    /* Body text */
    --font-weight-medium: 500;     /* Links */
    --font-weight-semibold: 600;   /* Menu items, headings */
    --font-weight-bold: 700;       /* Name (H1) */
    
    /* Font Sizes - Slightly adjusted for monospace */
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-base: 16px;
    --font-size-lg: 20px;
    --font-size-h1: clamp(50px, 6.5vw, 76px);
    --font-size-headline: clamp(17px, 1.8vw, 20px);
    
    /* Line Heights */
    --line-height-tight: 1.1;
    --line-height-snug: 1.4;
    --line-height-base: 1.7;
    
    /* Letter Spacing - Adjusted for monospace */
    --tracking-tight: -0.01em;
    --tracking-normal: 0;
    --tracking-wide: 0.03em;
    --tracking-wider: 0.1em;
    
    /* Spacing */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 48px;
    --space-xl: 72px;
    --space-2xl: 120px;
    
    /* Layout */
    --grid-max-width: 1160px;
    --grid-margin: clamp(20px, 5vw, 80px);
    --header-height: 64px;
    --content-max-width: 60ch;
    
    /* Motion */
    --duration-fast: 180ms;
    --duration-base: 280ms;
    --duration-slow: 400ms;
    --ease-out: cubic-bezier(0.2, 0.8, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Reveal Animation */
    --reveal-distance: 12px;
    --reveal-duration: 280ms;
}

/* Light Theme (Default) */
[data-theme="light"] {
    --color-bg: #FAFAF9;
    --color-bg-elevated: #FFFFFF;
    --color-text: #1A1A1A;
    --color-text-muted: #6B6B6B;
    --color-accent: #1A1A1A;
    --color-border: rgba(26, 26, 26, 0.08);
    --color-border-strong: rgba(26, 26, 26, 0.15);
    --color-focus: rgba(26, 26, 26, 0.4);
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg: #111111;
    --color-bg-elevated: #1A1A1A;
    --color-text: #F5F5F4;
    --color-text-muted: #8A8A8A;
    --color-accent: #E5E5E5;
    --color-border: rgba(245, 245, 244, 0.08);
    --color-border-strong: rgba(245, 245, 244, 0.15);
    --color-focus: rgba(245, 245, 244, 0.4);
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

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

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

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--duration-base) var(--ease-out),
                color var(--duration-base) var(--ease-out);
}

/* ==========================================================================
   Skip Link
   ========================================================================== */

.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-sm);
    z-index: 1000;
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border-strong);
    text-decoration: none;
    transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
    top: var(--space-sm);
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
}

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--header-height);
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    transition: background-color var(--duration-base) var(--ease-out),
                border-color var(--duration-base) var(--ease-out);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--grid-max-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--grid-margin);
}

.logo {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    letter-spacing: var(--tracking-wide);
    color: var(--color-text);
    text-decoration: none;
    transition: opacity var(--duration-fast) var(--ease-out);
}

.logo:hover {
    opacity: 0.7;
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.nav-primary {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.nav-list {
    display: flex;
    gap: var(--space-md);
    margin: 0;
    padding: 0;
    list-style: none;
}

.nav-link {
    position: relative;
    display: block;
    padding: var(--space-xs) 0;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--tracking-wide);
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-out);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--color-text);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--duration-base) var(--ease-out);
}

.nav-link:hover,
.nav-link:focus,
.nav-link.is-active {
    color: var(--color-text);
}

.nav-link:hover::after,
.nav-link:focus::after,
.nav-link.is-active::after {
    transform: scaleX(1);
}

.nav-link:focus {
    outline: none;
}

.nav-link:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 4px;
}

/* ==========================================================================
   Theme Toggle
   ========================================================================== */

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.theme-auto {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    padding: 0 12px;
    background: transparent;
    border: 1px solid var(--color-border-strong);
    border-radius: 999px;
    color: var(--color-text-muted);
    cursor: pointer;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    transition: border-color var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out),
                color var(--duration-fast) var(--ease-out);
}

.theme-auto:hover,
.theme-auto:focus-visible {
    border-color: var(--color-text-muted);
    color: var(--color-text);
}

.theme-auto.is-active {
    background-color: var(--color-text);
    border-color: var(--color-text);
    color: var(--color-bg);
}

.theme-auto:focus {
    outline: none;
}

.theme-auto:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: 1px solid var(--color-border-strong);
    border-radius: 50%;
    cursor: pointer;
    transition: border-color var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out);
}

.theme-toggle:hover {
    border-color: var(--color-text-muted);
}

.theme-toggle:focus {
    outline: none;
}

.theme-toggle:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
}

.theme-toggle-icon {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--color-text);
    transition: transform var(--duration-base) var(--ease-out),
                background-color var(--duration-base) var(--ease-out);
}

[data-theme="dark"] .theme-toggle-icon {
    transform: scale(0.6);
    background-color: var(--color-text);
}

/* ==========================================================================
   Main Content
   ========================================================================== */

main {
    padding-top: var(--header-height);
}

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

/* ==========================================================================
   Sections
   ========================================================================== */

.section {
    scroll-margin-top: var(--header-height);
    padding: var(--space-2xl) 0;
}

.section-intro {
    padding-top: var(--space-2xl);
    padding-bottom: var(--space-xl);
}

.section-links,
.section-memberships,
.section-cv {
    padding: var(--space-xl) 0;
}

.section-divider {
    max-width: var(--grid-max-width);
    margin: 0 auto;
    padding: 0 var(--grid-margin);
    border: none;
    border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   Intro Section
   ========================================================================== */

.intro-content {
    max-width: var(--content-max-width);
}

.title-primary {
    margin: 0 0 var(--space-sm) 0;
    font-size: var(--font-size-h1);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    letter-spacing: var(--tracking-tight);
    background-image: url('../images/header-smb.jpg');
    background-size: cover;
    background-position: center;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.headline {
    margin: 0 0 var(--space-lg) 0;
    font-size: var(--font-size-headline);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    letter-spacing: var(--tracking-normal);
    color: var(--color-text-muted);
}

.lead {
    margin: 0 0 var(--space-lg) 0;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-base);
    color: var(--color-text);
    max-width: var(--content-max-width);
}

/* ==========================================================================
   Biography Details/Summary
   ========================================================================== */

.bio-details {
    margin-top: var(--space-md);
}

.bio-summary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) 0;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    letter-spacing: var(--tracking-wide);
    color: var(--color-text);
    cursor: pointer;
    list-style: none;
    transition: color var(--duration-fast) var(--ease-out);
}

.bio-summary::-webkit-details-marker {
    display: none;
}

.bio-summary::marker {
    display: none;
    content: '';
}

.bio-summary:hover {
    color: var(--color-text-muted);
}

.bio-summary:focus {
    outline: none;
}

.bio-summary:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 4px;
}

.bio-summary-icon {
    display: inline-block;
    width: 0;
    height: 0;
    border-left: 5px solid var(--color-text);
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    transition: transform var(--duration-base) var(--ease-out);
}

.bio-details[open] .bio-summary-icon {
    transform: rotate(90deg);
}

.bio-content {
    padding-top: var(--space-md);
    max-width: var(--content-max-width);
}

.bio-content p {
    margin: 0;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-base);
    color: var(--color-text-muted);
}

/* ==========================================================================
   Section Headings
   ========================================================================== */

.label-heading {
    margin: 0 0 var(--space-md) 0;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-snug);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    color: var(--color-text-muted);
}

/* ==========================================================================
   Link Lists
   ========================================================================== */

.link-list,
.membership-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.link-item,
.membership-item {
    border-bottom: 1px solid var(--color-border);
}

.link-item:last-child,
.membership-item:last-child {
    border-bottom: none;
}

.link-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) 0;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    text-decoration: none;
    transition: transform var(--duration-fast) var(--ease-out),
                color var(--duration-fast) var(--ease-out);
}

.link-row:hover {
    transform: translateY(-1px);
}

.link-row:focus {
    outline: none;
}

.link-row:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 4px;
}

.link-text {
    position: relative;
}

.link-row::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-text);
}

.link-row:hover .link-text::after,
.link-row:focus .link-text::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--color-text);
    animation: underline-expand var(--duration-base) var(--ease-out) forwards;
}

@keyframes underline-expand {
    from {
        transform: scaleX(0);
        transform-origin: left;
    }
    to {
        transform: scaleX(1);
        transform-origin: left;
    }
}

.link-note {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-regular);
    color: var(--color-text-muted);
}

.link-arrow {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    transition: transform var(--duration-fast) var(--ease-out),
                color var(--duration-fast) var(--ease-out);
}

.link-row:hover .link-arrow {
    transform: translateX(4px);
    color: var(--color-text);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
    padding: var(--space-xl) 0 var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.footer-text {
    margin: 0;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-regular);
    color: var(--color-text-muted);
    letter-spacing: var(--tracking-wide);
}

/* ==========================================================================
   Reveal Animation
   ========================================================================== */

.reveal {
    opacity: 0;
    transform: translateY(var(--reveal-distance));
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity var(--reveal-duration) var(--ease-out),
                transform var(--reveal-duration) var(--ease-out);
}

/* No JS fallback - show content immediately */
.no-js .reveal {
    opacity: 1;
    transform: none;
}

/* ==========================================================================
   Reduced Motion
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    html {
        scroll-behavior: auto;
    }
    
    .reveal {
        opacity: 1;
        transform: none;
    }
    
    .reveal.is-visible {
        transition: none;
    }
    
    .link-row:hover {
        transform: none;
    }
    
    .link-row:hover .link-arrow {
        transform: none;
    }
    
    .nav-link::after {
        transition: none;
    }
    
    .bio-summary-icon {
        transition: none;
    }
    
    .theme-toggle-icon {
        transition: none;
    }
}

/* ==========================================================================
   Responsive - Tablet
   ========================================================================== */

@media (max-width: 900px) {
    :root {
        --space-2xl: 96px;
        --space-xl: 64px;
    }
    
    .nav-list {
        gap: var(--space-sm);
    }
}

/* ==========================================================================
   Responsive - Mobile
   ========================================================================== */

@media (max-width: 640px) {
    :root {
        --space-2xl: 72px;
        --space-xl: 48px;
        --space-lg: 32px;
        /* Mobile header wraps into two rows; reserve the full fixed-header height plus breathing room so it cannot crowd the intro title. */
        --header-height: 132px;
        --font-size-h1: clamp(30px, 7vw, 40px);
    }
    
    .header-inner {
        flex-wrap: wrap;
        padding: 0 var(--space-sm);
    }
    
    .logo {
        order: 1;
    }
    
    .header-actions {
        order: 2;
    }

    .theme-auto {
        height: 36px;
        padding: 0 10px;
    }

    .theme-toggle {
        width: 36px;
        height: 36px;
    }
    
    .nav-primary {
        position: relative;
        left: auto;
        transform: none;
        order: 3;
        width: 100%;
        margin-top: var(--space-xs);
        padding-bottom: var(--space-xs);
        border-top: 1px solid var(--color-border);
    }
    
    .site-header {
        height: auto;
        min-height: var(--header-height);
        padding: var(--space-xs) 0;
    }
    
    .nav-list {
        justify-content: flex-start;
        gap: clamp(var(--space-xs), 3vw, var(--space-sm));
        overflow-x: auto;
        flex-wrap: nowrap;
        scrollbar-width: none;
        -webkit-overflow-scrolling: touch;
    }

    .nav-list::-webkit-scrollbar {
        display: none;
    }
    
    .nav-link {
        padding: var(--space-xs) 0;
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    .section {
        scroll-margin-top: calc(var(--header-height) + 48px);
    }
    
    .section-intro {
        padding-top: calc(var(--space-xl) + var(--space-sm));
    }
    
    .title-primary {
        margin-bottom: var(--space-xs);
        max-width: 16ch;
    }
    
    .headline {
        margin-bottom: var(--space-md);
    }
    
    .lead {
        margin-bottom: var(--space-md);
    }
    
    .link-row {
        padding: var(--space-sm) 0;
        min-height: 48px;
    }
    
    .container {
        padding: 0 var(--space-sm);
    }
    
    .section-divider {
        padding: 0 var(--space-sm);
    }
}

/* ==========================================================================
   Focus Visible Fallback
   ========================================================================== */

/* For browsers that don't support :focus-visible */
@supports not selector(:focus-visible) {
    .nav-link:focus,
    .link-row:focus,
    .theme-auto:focus,
    .theme-toggle:focus,
    .bio-summary:focus,
    .skip-link:focus {
        outline: 2px solid var(--color-focus);
        outline-offset: 4px;
    }
}