/* THE LOCAL STACK - TE Design System */
/* Teenage Engineering-inspired: precise, modular, typographically split */

:root {
    /* TE Color Palette */
    --accent: #245AE7;
    --accent-online: #00D084;
    --accent-offline: #DC143C;
    --accent-maintenance: #B0B0B0;
    --accent-bright: #4277FF;

    /* Grey scale - Light Mode */
    --bg: #E8E8E8;
    --bg-elevated: #F2F2F2;
    --bg-sunken: #D5D5D5;
    --bg-card-hover: #FFFFFF;

    --text: #1A1A1A;
    --text-secondary: #555555;

    --border: #CCCCCC;
    --border-strong: #999999;

    /* Typography - improved readability */
    --font-sans: 'Inter', -apple-system, 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Monaco', 'Menlo', 'Courier New', monospace;

    /* Spacing (8px grid) */
    --space-1: 8px;
    --space-2: 16px;
    --space-3: 24px;
    --space-4: 32px;
    --space-5: 40px;
    --space-6: 48px;
    --space-8: 64px;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg: #1A1A1A;
    --bg-elevated: #242424;
    --bg-sunken: #0F0F0F;
    --bg-card-hover: #2A2A2A;

    --text: #E5E5E5;
    --text-secondary: #999999;

    --border: #333333;
    --border-strong: #444444;
}

/* Respect system preference */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #1A1A1A;
        --bg-elevated: #242424;
        --bg-sunken: #0F0F0F;
        --bg-card-hover: #2A2A2A;

        --text: #E5E5E5;
        --text-secondary: #999999;

        --border: #333333;
        --border-strong: #444444;
    }
}

/* RESET */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* SMOOTH SCROLL */
html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    /*background-image: radial-gradient(circle, var(--border) 1px, transparent 1px);
    background-size: 24px 24px;*/
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 var(--space-3);
}

.accent-bar {
    height: 3px;
    background: var(--accent);
    width: 100%;
}

/* ============================
   HEADER & product nameplate
   ============================ */
header {
    border-bottom: 1px solid var(--border);
    box-shadow: 0 1px 0 var(--border-strong);
    padding: var(--space-4) 0;
    margin-bottom: var(--space-5);
    background: var(--bg-elevated);
}

.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.site-title a {
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text);
    text-decoration: none;
    border: none;
    letter-spacing: 0.02em;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.site-title a::before {
    content: "\25CF";
    color: var(--accent);
    font-size: 10px;
    text-shadow: 0 0 6px var(--accent);
    animation: pulse 2s infinite;
}

.site-title a:hover {
    color: var(--accent);
    background: transparent;
}

/* ============================
   NAVIGATION & tactile buttons
   ============================ */
nav {
    display: flex;
    gap: var(--space-1);
    flex-wrap: wrap;
}

nav a {
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text);
    text-decoration: none;
    border: 1px solid var(--border);
    padding: 6px 14px;
    background: var(--bg);
    transition: all 0.15s ease;
    letter-spacing: 0.04em;
}

nav a:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--bg);
    transform: translateY(-1px);
}

nav a:active {
    transform: scale(0.97);
}

main {
    min-height: calc(100vh - 400px);
    padding: var(--space-4) 0 var(--space-6);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-sans);
    text-transform: uppercase;
    letter-spacing: -0.03em;
    font-weight: 700;
    margin: var(--space-5) 0 var(--space-2) 0;
    color: var(--text);
    line-height: 1.2;
}

/* h1: default style for posts */
h1 {
    font-size: 26px;
    border-bottom: 2px solid var(--accent);
    padding-bottom: var(--space-2);
    margin-top: 0;
    position: relative;
    padding-left: 14px;
}

h1::before {
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
    width: 4px;
    height: 4px;
    background: var(--accent);
}

/* h2: // prefix like TE section markers */
h2 {
    font-size: 22px;
    border-bottom: 1px solid var(--border-strong);
    padding-bottom: var(--space-1);
    padding-left: 28px;
    position: relative;
}

h2::before {
    content: "//";
    position: absolute;
    left: 0;
    font-family: var(--font-mono);
    font-size: 16px;
    color: var(--accent);
    font-weight: 400;
}

h3 { font-size: 17px; }
h4 { font-size: 15px; }

p {
    margin: var(--space-2) 0;
}

strong {
    font-weight: 700;
}

/* ============================
   LINKS underline offset hover
   ============================ */
a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid var(--accent);
    transition: all 0.15s ease;
}

a:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
    background: transparent;
    color: var(--accent-bright);
}

::selection {
    background: var(--accent);
    color: #fff;
}

::-moz-selection {
    background: var(--accent);
    color: #fff;
}

/* ============================
   SECTION LABEL accent dot prefix
   ============================ */
.section-label {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text);
    margin-bottom: var(--space-3);
    padding-bottom: var(--space-2);
    border-bottom: 2px solid var(--accent);
    padding-left: 20px;
    position: relative;
}

.section-label::before {
    content: "\25CF";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-size: 10px;
    top: 3px;
    text-shadow: 0 0 6px var(--accent);
}

/* ============================
   HOME HERO large title + tagline with cursor
   ============================ */
.home-hero {
    margin-bottom: var(--space-6);
}

.home-title {
    font-size: 36px;
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: var(--space-1);
    padding-left: 14px;
}

.home-subtitle {
    font-family: var(--font-mono);
    font-size: 18px;
    color: var(--accent);
    margin: var(--space-1) 0;
    letter-spacing: 0.01em;
}

.cursor {
    display: inline-block;
    margin-left: 2px;
    animation: blink 1s step-end infinite;
    color: var(--text-secondary);
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.home-blurb {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 600px;
    margin-top: var(--space-2);
}

/* ============================
   STATUS PANEL & system status module
   ============================ */
.status-panel {
    margin-bottom: var(--space-6);
}

.status-panel .section-label {
    margin-bottom: var(--space-2);
}

.status-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-3);
}

.status-card-online {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-top: 2px solid var(--accent-online);
    position: relative;
    padding: var(--space-3);
}

.status-card-offline {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-top: 2px solid var(--accent-offline);
    position: relative;
    padding: var(--space-3);
}

.status-card-maintenance {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-top: 2px solid var(--accent-maintenance);
    position: relative;
    padding: var(--space-3);
}

.status-dot-online {
    width: 6px;
    height: 6px;
    background: var(--accent-online);
    border-radius: 50%;
    /*flex-shrink: 0;*/
    box-shadow: 0 0 4px var(--accent-online);
    animation: pulse 2s infinite;
    display: inline-block;
}

.status-dot-offline {
    width: 6px;
    height: 6px;
    background: var(--accent-offline);
    border-radius: 50%;
    /*flex-shrink: 0;*/
    box-shadow: 0 0 4px var(--accent-offline);
    animation: pulse 2s infinite;
    display: inline-block;
}

.status-dot-maintenance {
    width: 6px;
    height: 6px;
    background: var(--accent-maintenance);
    border-radius: 50%;
    /*flex-shrink: 0;*/
    box-shadow: 0 0 4px var(--accent-maintenance);
    display: inline-block;
}

.status-label {
    font-family: var(--font-mono);
    font-size: 16px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin: 0 0 var(--space-1) 0;
    padding: 0;
}

.service-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.service-link {
    font-size: 13px;
    font-weight: 500;
    line-height: 1.6;
    text-decoration: none;
    /*display: inline-block;*/
    /*padding: 0.25rem 0;*/
    transition: all 0.2s ease;    
}

.service-status {
    display: block;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.status-value {
    font-family: var(--font-mono);
    color: var(--text);
    font-size: 14px;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding-left: 0.4em;
}

.status-uptime {
    font-family: var(--font-mono);
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    float: right;
}

/* ============================
   PRINCIPLES GRID & 3-column cards
   ============================ */
.principles-section {
    margin-bottom: var(--space-6);
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-3);
}

.principle-card {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-top: 2px solid var(--accent);
    padding: var(--space-3);
}

.principle-label {
    font-family: var(--font-mono);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin: 0 0 var(--space-1) 0;
    padding: 0;
}

.principle-label::before {
    display: none;
}

.principle-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* ============================
   QUICK LINKS & CTA button row
   ============================ */
.quick-links {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
}

.quick-links a {
    font-family: var(--font-mono);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border: 1px solid var(--border);
    padding: 10px 24px;
    color: var(--text);
    background: var(--bg-elevated);
    transition: all 0.15s ease;
    flex: 1;
    text-align: center;
}

.quick-links a:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--bg);
    text-decoration: none;
    transform: translateY(-1px);
}

footer {
    border-top: 1px solid var(--border-strong);
    margin-top: var(--space-8);
    padding: var(--space-5) 0 var(--space-4);
    background: var(--bg-elevated);
}

/* ============================
   SOCIAL LINKS
   ============================ */
.social-links {
    display: flex;
    gap: var(--space-1);
    justify-content: center;
    margin: var(--space-3) 0;
}

.social-links a {
    font-family: var(--font-mono);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 6px 12px;
    background: var(--bg);
    transition: all 0.15s ease;
}

.social-links a::after {
    content: " \2197";
    font-size: 9px;
}

.social-links a:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--bg);
    text-decoration: none;
}

.footer-copy {
    text-align: center;
    font-family: var(--font-mono);
    font-size: 10px;
    margin-top: var(--space-4);
    color: var(--text-secondary);
    letter-spacing: 0.04em;
}

.footer-copy p {
    margin: 4px 0;
}

.footer-mfg {
    text-align: center;
    font-family: var(--font-mono);
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--border-strong);
    margin-top: var(--space-3);
}

.status-indicator {
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    margin-right: 4px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}


/* ============================
   RESPONSIVE
   ============================ */
@media (max-width: 768px) {
    .site-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }

    nav {
        width: 100%;
        flex-wrap: wrap;
    }

    .footer-specs {
        grid-template-columns: 1fr;
    }

    .footer-specs .spec-line {
        border-right: none;
    }

    .footer-specs .spec-line:last-child {
        border-bottom: none;
    }

    .post-nav {
        grid-template-columns: 1fr;
    }

    .post-nav-item.next {
        text-align: left;
    }

    .home-title {
        font-size: 28px;
    }

    .home-subtitle {
        font-size: 15px;
    }

    .principles-grid {
        grid-template-columns: 1fr;
    }

    .quick-links {
        flex-direction: column;
    }

    h1 {
        font-size: 24px;
    }

    h2 {
        font-size: 19px;
    }

    /* Hide decorative pseudo-elements on small screens */
    .post-list-item::before,
    .post-list-item::after {
        display: none;
    }

    hr::after {
        display: none;
    }

    .diagnostic-code {
        font-size: 64px;
    }
}

/* ============================
   THEME TOGGLE — hardware switch
   ============================ */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
}

.theme-toggle-label {
    opacity: 0.6;
}

.theme-toggle-label.active {
    opacity: 1;
    color: var(--accent);
}

.theme-switch {
    position: relative;
    width: 44px;
    height: 22px;
    background: var(--bg-sunken);
    border: 1px solid var(--border-strong);
    border-radius: 0;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0;
    outline: none;
}

.theme-switch::before {
    content: "";
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    background: var(--text-secondary);
    transition: all 0.2s ease;
}

.theme-switch:hover {
    border-color: var(--accent);
}

.theme-switch:hover::before {
    background: var(--accent);
}

[data-theme="dark"] .theme-switch::before,
.theme-switch.dark::before {
    left: 24px;
    background: var(--accent);
    box-shadow: 0 0 8px var(--accent);
}

/* Header layout adjustment for toggle */
.header-controls {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-wrap: wrap;
}

/* Mobile: stack nav and toggle vertically */
@media (max-width: 768px) {
    .header-controls {
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }

    .theme-toggle {
        margin-top: var(--space-1);
    }

    .theme-switch {
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
    }
}

/* PRINT */
@media print {
    .accent-bar,
    nav,
    .social-links,
    .post-nav,
    .theme-toggle {
        display: none;
    }

    body {
        background: #fff;
        background-image: none;
        color: #000;
        font-size: 12pt;
    }

    header, footer {
        background: #fff;
    }

    a {
        color: #000;
        border-bottom: none;
    }

    pre {
        border: 1px solid #ccc;
        background: #f5f5f5;
        color: #000;
    }

    pre::before,
    pre::after {
        display: none;
    }
}