/* ==========================================================================
   Base & Reset
   ========================================================================== */
   :root {
    /* Color Palette */
    --color-bg-main: #f5f8f7;
    --color-bg-alt: #edf4f2;
    --color-text-main: #132b3a;
    --color-text-muted: #5d6d73;
    --color-text-light: #6f8187;
    --color-border: #d8e2e1;
    --color-accent: #19877b;
    --color-accent-dark: #11665e;
    
    /* Interactive Colors */
    --color-primary: #173a52;
    --color-primary-hover: #11665e;
    --color-secondary-bg: #ffffff;
    --color-secondary-border: #b7c8c7;
    --color-secondary-hover: #edf4f2;

    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;

    /* Shadows & Radii */
    --radius-sm: 4px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text-main);
    background-color: var(--color-bg-main);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

a:hover {
    color: var(--color-text-muted);
}

ul, ol, dl {
    list-style: none;
}

/* ==========================================================================
   Layout & Container
   ========================================================================== */
.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

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

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-sm);
    color: var(--color-text-main);
    letter-spacing: -0.02em;
}

.section-title {
    font-size: clamp(2.15rem, 4vw, 3.8rem);
    line-height: 1.06;
    letter-spacing: -0.045em;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(245, 248, 247, 0.94);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1180px;
    margin: 0 auto;
    min-height: 76px;
    padding: 0 var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: -0.01em;
}

.nav-mark {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    color: #ffffff;
    background: var(--color-primary);
    font-family: 'Cascadia Mono', 'SFMono-Regular', Consolas, monospace;
    font-size: 0.8rem;
}

.nav-links {
    display: flex;
    gap: var(--space-md);
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

.nav-links a:hover {
    color: var(--color-text-main);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    color: #ffffff;
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background-color: var(--color-secondary-bg);
    color: var(--color-text-main);
    border-color: var(--color-secondary-border);
}

.btn-secondary:hover {
    background-color: var(--color-secondary-hover);
    color: var(--color-text-main);
}

.link-subtle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: underline;
    text-underline-offset: 4px;
    color: var(--color-text-muted);
}

.link-subtle:hover {
    color: var(--color-text-main);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
    padding: clamp(5rem, 10vw, 8rem) 0;
    background-image: linear-gradient(rgba(23, 58, 82, 0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(23, 58, 82, 0.04) 1px, transparent 1px);
    background-size: 48px 48px;
}

.hero-eyebrow {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent-dark);
    font-family: 'Cascadia Mono', 'SFMono-Regular', Consolas, monospace;
    margin-bottom: var(--space-sm);
}

.hero-title {
    font-size: clamp(3rem, 6vw, 5.6rem);
    font-weight: 700;
    letter-spacing: -0.055em;
    max-width: 900px;
    margin-bottom: var(--space-md);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 700px;
    margin-bottom: var(--space-md);
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
    flex-wrap: wrap;
}

/* ==========================================================================
   Work Section
   ========================================================================== */
.work-section {
    padding: var(--space-xl) 0;
}

.project-card {
    background-color: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.project-card:hover {
    border-color: #b7c8c7;
    box-shadow: var(--shadow-sm);
}

.project-card.flagship {
    padding: var(--space-lg);
    border-top: 3px solid var(--color-accent);
}

.project-header {
    margin-bottom: var(--space-md);
}

.project-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent-dark);
    font-family: 'Cascadia Mono', 'SFMono-Regular', Consolas, monospace;
    margin-bottom: var(--space-xs);
}

.project-title {
    font-size: 1.5rem;
    margin-bottom: 0;
}

.project-content {
    margin-bottom: var(--space-md);
}

.flagship-layout {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.project-image {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

@media (min-width: 768px) {
    .flagship-layout {
        flex-direction: row;
        align-items: flex-start;
        gap: var(--space-lg);
    }
    
    .flagship-text {
        flex: 1;
    }
    
    .flagship-visual {
        flex: 1;
    }
}

.project-info {
    margin-bottom: var(--space-md);
}

.project-info:last-child {
    margin-bottom: 0;
}

.info-title {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-light);
    margin-bottom: var(--space-xs);
}

.info-list {
    list-style-type: disc;
    padding-left: 1.25rem;
    color: var(--color-text-muted);
}

.info-list li {
    margin-bottom: 0.25rem;
}

.info-list.compact {
    list-style-type: none;
    padding-left: 0;
}

.info-list.compact li {
    position: relative;
    padding-left: 1rem;
}
.info-list.compact li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-text-light);
}

.project-description {
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.project-actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    align-items: center;
}

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 500;
    background-color: var(--color-bg-alt);
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    border-radius: 9999px;
}

/* ==========================================================================
   Capabilities Section
   ========================================================================== */
.capabilities-section {
    padding: var(--space-xl) 0;
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
}

.capability-group h3 {
    font-size: 1rem;
    margin-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--space-xs);
}

.capability-group ul {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.capability-group li {
    margin-bottom: 0.5rem;
}

/* ==========================================================================
   About Section
   ========================================================================== */
.about-section {
    padding: var(--space-xl) 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.approach-list dt {
    font-weight: 600;
    margin-top: var(--space-sm);
    color: var(--color-text-main);
}

.approach-list dd {
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
    font-size: 0.9375rem;
}

.bio-content p {
    margin-bottom: var(--space-sm);
    color: var(--color-text-muted);
}

.timeline {
    margin-top: var(--space-md);
    border-left: 2px solid var(--color-border);
    padding-left: var(--space-sm);
}

.timeline-item {
    margin-bottom: var(--space-sm);
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(var(--space-sm) * -1 - 5px);
    top: 5px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-text-light);
}

.timeline-year {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-light);
    display: block;
    margin-bottom: 0.125rem;
}

.timeline-info strong {
    display: block;
    color: var(--color-text-main);
}

.timeline-org {
    display: block;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.timeline-meta {
    display: block;
    color: var(--color-text-light);
    font-size: 0.75rem;
    margin-top: 0.125rem;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-section {
    padding: var(--space-xl) 0;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    max-width: 400px;
}

.contact-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm);
    background-color: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.contact-link:hover {
    border-color: var(--color-text-muted);
    box-shadow: var(--shadow-sm);
}

.link-title {
    font-weight: 500;
    color: var(--color-text-main);
}

.link-url {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.contact-placeholders {
    margin-top: var(--space-md);
}

.placeholder-note {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
    padding: var(--space-md) 0;
    text-align: center;
    font-size: 0.875rem;
    color: #9eb7bb;
    background: #0a2434;
    border-top: 0;
}

.site-footer p { color: inherit; }

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 768px) {
    :root {
        --space-xl: 4rem;
        --space-lg: 3rem;
    }

    .hero-title {
        font-size: 2.25rem;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .nav-links {
        display: none; /* simple mobile nav approach - could add hamburger if needed, but keeping it minimal for V1 */
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-actions .btn {
        width: 100%;
    }
    
    .hero-actions .link-subtle {
        text-align: center;
        padding: 0.5rem 0;
    }
    
    .project-card.flagship {
        padding: var(--space-md);
    }
}

/* DSP showcase extensions */
.nav-external { display:flex; gap:1rem; align-items:center; }
.nav-external a { font-size:.85rem; font-weight:600; color:var(--color-text-muted); }
.nav-external a:hover { color:var(--color-text-main); }
.dsp-hero { padding: clamp(4.5rem, 9vw, 7rem) 0; }
.hero-grid { display:grid; grid-template-columns:minmax(0,1.25fr) minmax(320px,.75fr); gap:4rem; align-items:start; }
.hero-metrics { display:grid; grid-template-columns:1fr 1fr; gap:1px; border:1px solid var(--color-border); background:var(--color-border); }
.hero-metrics article { background:#fff; padding:1.4rem; min-height:145px; display:flex; flex-direction:column; justify-content:flex-end; }
.hero-metrics span,.spec-cards span,.validation-card span,.complexity-grid span { font-family:'Cascadia Mono','SFMono-Regular',Consolas,monospace; text-transform:uppercase; letter-spacing:.06em; font-size:.7rem; color:var(--color-text-light); }
.hero-metrics strong { font-size:1.55rem; letter-spacing:-.04em; margin:.45rem 0 .3rem; }
.hero-metrics small { color:var(--color-text-muted); line-height:1.35; }
.case-section { padding:var(--space-xl) 0; }
.section-kicker { font-family:'Cascadia Mono','SFMono-Regular',Consolas,monospace; color:var(--color-accent-dark); font-size:.78rem; font-weight:700; text-transform:uppercase; letter-spacing:.08em; margin-bottom:1rem; }
.two-column-copy { display:grid; grid-template-columns:1fr 1fr; gap:var(--space-lg); max-width:1000px; }
.two-column-copy p { color:var(--color-text-muted); font-size:1.05rem; }
.principle-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:1rem; margin-top:3rem; }
.principle-grid article,.validation-card { background:#fff; border:1px solid var(--color-border); padding:1.5rem; }
.principle-grid span { font-size:.72rem; text-transform:uppercase; letter-spacing:.08em; color:var(--color-accent-dark); font-weight:700; }
.principle-grid h3 { font-size:1.5rem; margin:.45rem 0; }
.principle-grid p,.validation-card p { color:var(--color-text-muted); }
.pipeline-flow { display:grid; grid-template-columns:repeat(9,auto); align-items:stretch; gap:.6rem; overflow-x:auto; padding:.5rem 0 1rem; }
.pipeline-flow article { min-width:150px; background:#fff; border:1px solid var(--color-border); padding:1.25rem; display:flex; flex-direction:column; }
.pipeline-flow article span { font-size:.7rem; color:var(--color-text-light); text-transform:uppercase; letter-spacing:.07em; }
.pipeline-flow article strong { font-size:1.25rem; margin:.45rem 0; }
.pipeline-flow article p { color:var(--color-text-muted); font-size:.85rem; }
.pipeline-flow i { align-self:center; font-style:normal; color:var(--color-text-light); font-size:1.4rem; }
.pipeline-flow .pipeline-output { border-top:3px solid var(--color-accent); }
.resolution-note,.scope-note { margin-top:2rem; padding:1rem 1.2rem; border-left:3px solid var(--color-accent); background:#fff; color:var(--color-text-muted); }
.resolution-note code { color:var(--color-text-main); }
.spec-layout { display:grid; grid-template-columns:1fr 1fr; gap:var(--space-lg); align-items:start; }
.spec-cards { display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--color-border); border:1px solid var(--color-border); }
.spec-cards article { background:#fff; padding:1.35rem; min-height:125px; }
.spec-cards strong { display:block; font-size:1.5rem; margin:.45rem 0 .15rem; }
.spec-cards small { color:var(--color-text-muted); }
.metric-table { width:100%; border-collapse:collapse; background:#fff; border:1px solid var(--color-border); }
.metric-table th,.metric-table td { text-align:left; padding:1rem; border-bottom:1px solid var(--color-border); }
.metric-table th { font-size:.75rem; text-transform:uppercase; letter-spacing:.06em; color:var(--color-text-light); }
.metric-table td:last-child { font-family:'Cascadia Mono','SFMono-Regular',Consolas,monospace; font-weight:600; }
.dark-section { background:#0a2434; color:#d8e5e7; }
.light-title { color:#fff; border-color:rgba(255,255,255,.18); }
.light-kicker { color:#72cfc2; }
.complexity-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:rgba(255,255,255,.14); border:1px solid rgba(255,255,255,.14); margin-bottom:2rem; }
.complexity-grid article { background:#0f3043; padding:1.4rem; min-height:155px; }
.complexity-grid span { color:#8fb2b8; }
.complexity-grid strong { display:block; color:#fff; font-size:2rem; margin:.5rem 0; letter-spacing:-.04em; }
.complexity-grid p { color:#b9cdd1; font-size:.88rem; }
.evidence-figure { margin:0; background:#fff; border:1px solid var(--color-border); padding:1rem; }
.evidence-figure img { display:block; width:100%; height:auto; }
.evidence-figure figcaption { color:var(--color-text-muted); font-size:.86rem; padding:.8rem .25rem .15rem; }
.dark-figure { background:#0f3043; border-color:rgba(255,255,255,.15); }
.dark-figure figcaption { color:#b9cdd1; }
.validation-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:1rem; margin-bottom:2rem; }
.validation-card strong { display:block; font-size:1.7rem; letter-spacing:-.04em; margin:.45rem 0; }
.figure-grid { display:grid; grid-template-columns:1fr 1fr; gap:1.25rem; }
.ownership-list { display:grid; grid-template-columns:repeat(3,1fr); border-top:1px solid var(--color-border); }
.ownership-list article { padding:1.5rem 1.5rem 1.5rem 0; border-bottom:1px solid var(--color-border); }
.ownership-list article:nth-child(3n+2),.ownership-list article:nth-child(3n+3) { padding-left:1.5rem; border-left:1px solid var(--color-border); }
.ownership-list span { font-family:'Cascadia Mono','SFMono-Regular',Consolas,monospace; color:var(--color-accent-dark); font-size:.78rem; }
.ownership-list h3 { margin:.45rem 0; }
.ownership-list p { color:var(--color-text-muted); }
.closing-actions { display:flex; gap:1rem; flex-wrap:wrap; margin-top:2rem; }
@media (max-width: 900px) {
  .hero-grid,.spec-layout,.figure-grid,.two-column-copy { grid-template-columns:1fr; gap:2rem; }
  .complexity-grid,.validation-grid { grid-template-columns:1fr 1fr; }
  .ownership-list { grid-template-columns:1fr 1fr; }
  .ownership-list article:nth-child(n) { padding:1.25rem; border-left:0; border-bottom:1px solid var(--color-border); }
}
@media (max-width: 768px) {
  .nav-external { gap:.7rem; }
  .nav-external a:first-child { display:none; }
  .hero-metrics,.spec-cards,.complexity-grid,.validation-grid,.ownership-list { grid-template-columns:1fr; }
  .pipeline-flow { grid-template-columns:1fr; overflow:visible; }
  .pipeline-flow i { transform:rotate(90deg); justify-self:center; }
  .pipeline-flow article { min-width:0; }
  .ownership-list article:nth-child(n) { padding:1.25rem 0; }
}

@media (max-width: 768px) {
  .nav-external { display:none; }
  .hero-grid > * { min-width:0; }
  .dsp-hero .hero-eyebrow { font-size:.68rem; line-height:1.5; overflow-wrap:anywhere; }
  .dsp-hero .hero-subtitle { max-width:100%; overflow-wrap:anywhere; }
  .evidence-figure img { max-width:100%; }
}

@media (max-width: 900px) {
  .hero-grid,.spec-layout,.figure-grid,.two-column-copy { grid-template-columns:minmax(0,1fr); }
  .hero-grid,.hero-grid > div,.hero-actions { min-width:0; width:100%; max-width:100%; }
}

@media (max-width: 768px) {
  .container { width:auto; max-width:none; margin-left:20px; margin-right:20px; padding-left:0; padding-right:0; }
  .hero-actions .btn { max-width:100%; }
}

/* Showcase evidence layout */
.filter-proof-grid {
  display:grid;
  grid-template-columns:minmax(0,1.35fr) minmax(300px,.65fr);
  gap:1.25rem;
  align-items:start;
  margin-top:1.25rem;
}
.filter-proof-grid .spec-table-wrap,.filter-proof-grid .metric-table { height:100%; }
.validation-evidence-grid {
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:2rem;
  align-items:start;
}
#problem,#pipeline,#filter,#validation { scroll-margin-top:96px; }
@media (max-width:900px) {
  .filter-proof-grid,.validation-evidence-grid { grid-template-columns:minmax(0,1fr); }
}

.evidence-link { display:block; cursor:zoom-in; }
.evidence-link img { transition:opacity var(--transition-fast); }
.evidence-link:hover img { opacity:.96; }
.skip-link { position:fixed; top:8px; left:12px; z-index:200; padding:12px; background:#fff; transform:translateY(-160%); }
.skip-link:focus { transform:translateY(0); }
a:focus-visible { outline:3px solid #b36a17; outline-offset:4px; }
@media (prefers-reduced-motion:reduce) { html { scroll-behavior:auto; } }
@media (max-width:768px) {
  .principle-grid { grid-template-columns:minmax(0,1fr); }
  .nav-container { flex-wrap:wrap; padding:12px 20px 6px; gap:6px; }
  .nav-links { display:flex; order:3; width:100%; justify-content:space-between; gap:8px; }
  .nav-links a { display:inline-block; padding:10px 0; font-size:.75rem; }
  .nav-external { display:flex; margin-left:auto; }
  .nav-external a:first-child { display:inline; }
  .nav-external a { font-size:.75rem; }
  #problem,#pipeline,#filter,#validation { scroll-margin-top:130px; }
}