/* =========================================================
   BASE.CSS
   Gemeinsame Basis für index.html, proxmox2025.html, hidrive-rclone.html
   Design-Tokens, Reset, Header/Nav, Theme-Toggle, Footer-Grundgerüst
   ========================================================= */

/* ===== DESIGN TOKENS ===== */
:root {
    --green-bright: #4ade80;
    --green-mid: #22c55e;
    --green-dark: #15803d;
    --green-dim: #166534;

    --transition-speed: 0.25s;
}

[data-theme="dark"] {
    --bg-base:      #0a0f0d;
    --bg-surface:   #111a14;
    --bg-card:      #162019;
    --bg-hover:     #1e2e22;
    --border:       #253529;
    --text-primary: #e8f5e9;
    --text-secondary:#94a89a;
    --text-muted:   #5a7060;
    --accent:       #4ade80;
    --accent-glow:  rgba(74,222,128,0.15);
    --footer-bg:    #080d0a;
    --code-bg:      #0d1610;
}

[data-theme="light"] {
    --bg-base:      #f4f9f5;
    --bg-surface:   #ffffff;
    --bg-card:      #eef6f0;
    --bg-hover:     #e3f0e7;
    --border:       #c8dece;
    --text-primary: #0d2010;
    --text-secondary:#3a5a42;
    --text-muted:   #7a9a80;
    --accent:       #15803d;
    --accent-glow:  rgba(21,128,61,0.10);
    --footer-bg:    #0d2010;
    --code-bg:      #e3f0e7;
}

/* ===== SKIP LINK (WCAG 2.4.1) ===== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    z-index: 9999;
    padding: 0.75rem 1.5rem;
    background: var(--accent);
    color: var(--bg-base);
    font-family: 'DM Mono', monospace;
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: 0 0 8px 8px;
    text-decoration: none;
    transition: top 0.2s;
}
.skip-link:focus {
    top: 0;
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'DM Sans', sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.75;
    min-height: 100vh;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* ===== NOISE TEXTURE OVERLAY ===== */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 0;
    opacity: 0.4;
}

/* WCAG 2.4.11: Focus appearance (gilt sitenweit) */
*:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 3px;
}

/* ===== HEADER ===== */
header {
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}

.header-inner {
    max-width: 1100px;
    margin: auto;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    justify-content: space-between;
    flex-wrap: wrap;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-area img {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    border: 2px solid var(--accent);
    box-shadow: 0 0 16px var(--accent-glow);
}

.brand-name {
    font-family: 'Syne', sans-serif;
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--text-primary);
    line-height: 1.2;
}

.brand-tagline {
    font-family: 'DM Mono', monospace;
    font-size: 0.7rem;
    color: var(--accent);
    letter-spacing: 0.05em;
}

nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

nav a {
    font-family: 'DM Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    transition: background var(--transition-speed), color var(--transition-speed);
}

nav a:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

nav a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* ===== TOGGLE BUTTON ===== */
#theme-toggle {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.45rem 1rem;
    font-family: 'DM Mono', monospace;
    font-size: 0.78rem;
    border-radius: 999px;
    cursor: pointer;
    transition: all var(--transition-speed);
    white-space: nowrap;
}

#theme-toggle:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
    color: var(--accent);
}

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

/* ===== FOOTER (Grundgerüst, Abstände je Seitentyp in home.css / tutorial.css) ===== */
.footer-inner {
    max-width: 1100px;
    margin: auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
}

.footer-col h3 {
    font-family: 'DM Mono', monospace;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 1rem;
}

.footer-col p, .footer-col address {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-style: normal;
    line-height: 1.8;
}

.footer-col a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-speed);
}

.footer-col a:hover { color: var(--accent); }

.footer-col a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 2px;
}

/* ===== RESPONSIVE (Header/Nav, sitenweit) ===== */
@media (max-width: 680px) {
    .header-inner { gap: 0.75rem; }
    nav a { padding: 0.35rem 0.6rem; }
}

/* ===== NAV DROPDOWN (Sitenweit für Header) ===== */
.nav-item {
    position: relative;
}

.nav-caret {
    display: inline-block;
    font-size: 0.6rem;
    margin-left: 0.3rem;
    transition: transform var(--transition-speed);
}

.nav-item.open .nav-caret {
    transform: rotate(180deg);
}

/* Dropdown-Container standardmäßig ausblenden */
.nav-dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 280px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.5rem;
    box-shadow: 0 12px 28px rgba(0,0,0,0.35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity var(--transition-speed), transform var(--transition-speed), visibility var(--transition-speed);
    z-index: 200;
    display: flex;
    flex-direction: column; /* Garantiert untereinander */
    gap: 0.2rem;
}

/* Nur öffnen wenn .open vorhanden */
.nav-item.open .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Links im Dropdown untereinander rendern */
.nav-dropdown-menu a {
    display: block;
    width: 100%;
    padding: 0.6rem 0.8rem;
    border-radius: 6px;
    font-size: 0.8rem;
    white-space: normal;
    line-height: 1.4;
    color: var(--text-secondary);
    text-decoration: none;
}

.nav-dropdown-menu a:hover {
    background: var(--bg-hover);
    color: var(--accent);
}

@media (max-width: 680px) {
    .nav-dropdown-menu {
        right: auto;
        left: 0;
    }
}