/* ========================================
   CSS Variables & Theme
   ======================================== */

:root {
    --logo-blue: #00008c;
    --logo-teal: #007b7b;

    --bg-primary:   #e8eaed;
    --bg-secondary: #f0f2f4;
    --bg-card:      #f0f2f4;
    --bg-nav:       #e8edf5;

    /* aliases for compatibility */
    --bg:   #e8eaed;
    --text: #0a0a0a;

    --text-primary:   #0a0a0a;
    --text-secondary: #525252;
    --text-muted:     #a3a3a3;

    --accent:       #2563eb;
    --accent-hover: #1d4ed8;
    --accent-muted: rgba(37, 99, 235, 0.07);
    --accent-text:  #ffffff;

    --border:        rgba(0, 0, 0, 0.07);
    --border-strong: rgba(0, 0, 0, 0.13);

    /* alias */
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.06);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.08), 0 4px 8px rgba(0, 0, 0, 0.04);

    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition:  all 0.18s ease;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
}

[data-theme="dark"] {
    --logo-blue: #9090e8;
    --logo-teal: #00b8b8;

    --bg-primary:   #1e1b18;
    --bg-secondary: #181512;
    --bg-card:      #131310;
    --bg-nav:       #141925;

    --bg:   #1e1b18;
    --text: #f5f5f5;

    --text-primary:   #f5f5f5;
    --text-secondary: #a3a3a3;
    --text-muted:     #666666;

    --accent:       #3b82f6;
    --accent-hover: #60a5fa;
    --accent-muted: rgba(59, 130, 246, 0.1);

    --border:        rgba(255, 255, 255, 0.06);
    --border-strong: rgba(255, 255, 255, 0.11);

    --shadow: 0 2px 8px rgba(0, 0, 0, 0.4);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.6);
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
    scroll-behavior: smooth;
    scrollbar-gutter: stable;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.25s ease, color 0.2s ease;
    min-height: 100vh;
}

/* ========================================
   Header & Breadcrumbs
   ======================================== */

.header {
    width: 100%;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-primary);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.5rem;
    max-width: 760px;
    margin: 0 auto;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    min-width: 0;
}

.logo-home {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    text-decoration: none;
}

.logo-icon {
    height: 1.5rem;
    width: auto;
    display: block;
}

.logo-brand {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--logo-blue);
}

.breadcrumb-sep {
    color: var(--text-muted);
    font-size: 0.85rem;
    user-select: none;
    padding: 0 0.1rem;
}

.breadcrumb-link {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--logo-teal);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumb-link:hover { opacity: 0.75; }

.breadcrumb-current {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--logo-teal);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

.controls {
    display: flex;
    gap: 0.625rem;
    align-items: center;
}

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

.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    width: 34px;
    height: 34px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    color: var(--text-muted);
}

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

.theme-toggle svg { width: 15px; height: 15px; }

/* Default (light mode): show moon - next in cycle is dark */
.theme-icon-light  { display: none; }
.theme-icon-system { display: none; }

/* Dark mode: show monitor - next in cycle is system */
[data-theme-mode="dark"] .theme-icon-dark   { display: none; }
[data-theme-mode="dark"] .theme-icon-system { display: block; }

/* System mode: show sun - next in cycle is light */
[data-theme-mode="system"] .theme-icon-dark  { display: none; }
[data-theme-mode="system"] .theme-icon-light { display: block; }

/* ========================================
   Burger Menu
   ======================================== */

.burger-menu { position: relative; }

.burger-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    width: 34px;
    height: 34px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    transition: var(--transition);
    padding: 0;
}

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

.burger-toggle span {
    display: block;
    width: 14px;
    height: 2px;
    background: var(--text-muted);
    border-radius: 1px;
    transition: var(--transition);
}

.burger-toggle[aria-expanded="true"] span { background: var(--text-primary); }

.burger-nav {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: var(--bg-nav);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    min-width: 210px;
    overflow: hidden;
    z-index: 200;
}

.burger-nav-link {
    display: block;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.burger-nav-link:hover {
    background: var(--accent-muted);
    color: var(--text-primary);
}

.burger-nav-soon {
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent);
    margin-left: 0.25rem;
    vertical-align: middle;
}

.burger-nav-sub {
    padding-left: 1.875rem;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.burger-nav-tools-row {
    display: flex;
    align-items: center;
}

.burger-nav-tools-row .burger-nav-link {
    flex: 1;
}

.burger-nav-chevron {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.625rem 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.burger-nav-chevron svg {
    width: 14px;
    height: 14px;
    transition: transform 0.2s ease;
}

.burger-nav-chevron:hover { color: var(--text-primary); }

.burger-nav-chevron[aria-expanded="true"] svg { transform: rotate(180deg); }

.burger-nav-tools-sub { display: none; }

.burger-nav-tools-sub.is-open { display: block; }

.burger-nav--tools-open .burger-nav-main-links { display: none; }

/* ========================================
   Language Switcher
   ======================================== */

.lang-switch { position: relative; }

.lang-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    height: 34px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.15rem;
    padding: 0 0.45rem;
    font-size: 1.1rem;
    line-height: 1;
    transition: var(--transition);
}

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

.lang-chevron {
    width: 11px;
    height: 11px;
    color: var(--text-muted);
    flex-shrink: 0;
    transition: transform 0.2s ease;
}

.lang-toggle[aria-expanded="true"] .lang-chevron { transform: rotate(180deg); }

.lang-flag-link {
    text-decoration: none;
    font-size: 1.4rem;
    line-height: 1;
    display: flex;
    align-items: center;
}

.lang-nav {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: var(--bg-nav);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    min-width: 140px;
    max-height: 70vh;
    overflow-x: hidden;
    overflow-y: auto;
    z-index: 200;
}

.lang-nav[hidden] { display: none !important; }

.lang-nav--2col {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    min-width: 300px;
}

.lang-nav--3col {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    min-width: 420px;
    max-height: none;
}

.lang-nav-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    white-space: nowrap;
}

a.lang-nav-item:hover {
    background: var(--accent-muted);
    color: var(--text-primary);
}

.lang-nav-item--active {
    color: var(--logo-teal);
    font-weight: 600;
    cursor: default;
}

/* ========================================
   Donate Section
   ======================================== */

.donate-section {
    max-width: 760px;
    width: 100%;
    margin: 0 auto;
    padding: 1.5rem 1.5rem 0;
    border-top: 1px solid var(--border);
    text-align: center;
}

.donate-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-family);
    font-size: 0.875rem;
    color: var(--text-muted);
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.donate-toggle:hover { color: var(--text-primary); }

.donate-chevron {
    width: 13px;
    height: 13px;
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.donate-toggle[aria-expanded="true"] .donate-chevron {
    transform: rotate(180deg);
}

.donate-body {
    margin-top: 1.25rem;
    text-align: left;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--shadow-sm);
}

.donate-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 1rem;
}

.donate-text a {
    color: var(--accent);
    text-decoration: none;
    transition: var(--transition);
}

.donate-text a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.donate-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.donate-link {
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    padding: 0.35rem 0.875rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-strong);
    color: var(--text-secondary);
    transition: var(--transition);
}

.donate-link:hover { border-color: var(--accent); color: var(--accent); }

.donate-link-primary { border-color: var(--accent); color: var(--accent); }

.donate-link-primary:hover { background: var(--accent); color: var(--accent-text); }

.donate-link-secondary { opacity: 0.7; }
.donate-link-secondary:hover { opacity: 1; }

button.donate-link { cursor: pointer; font-family: var(--font-family); background: none; }

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

.footer {
    max-width: 760px;
    width: 100%;
    margin: 2rem auto 0;
    padding: 2.5rem 1.5rem 1.5rem;
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-col-title {
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-primary);
    margin-bottom: 0.875rem;
}

.footer-col-text {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.footer-impressum { font-size: 0.775rem; }

.footer-impressum-law {
    font-size: 0.7rem;
    color: var(--text-muted);
    display: inline-block;
    margin-top: 0.5rem;
}

.footer-col-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-col-nav a {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

.footer-col-nav a:hover { color: var(--text-primary); }

.footer-col-sub { padding-left: 1rem; }

.footer-col-soon span {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent);
    margin-left: 0.35rem;
    vertical-align: middle;
}

.footer-bottom {
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
    font-size: 0.775rem;
    color: var(--text-muted);
    text-align: center;
}

.footer-copyleft {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

.footer-copyleft:hover { color: var(--text-primary); }

.footer-impressum a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}
.footer-impressum a:hover { color: var(--text-primary); }

.footer-social {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
    align-items: center;
    padding: 1.25rem 0;
    margin-bottom: 0;
}

.footer-social-link {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}
.footer-social-link:hover { color: var(--text-primary); }

.social-icon {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    width: 1.1em;
    height: 1.1em;
}
.social-icon img {
    width: 1.1em;
    height: 1.1em;
}

.social-icon-dark { display: none; }
[data-theme="dark"] .social-icon-dark { display: flex; }
[data-theme="dark"] .social-icon-light { display: none; }

/* ========================================
   Disclaimer page
   ======================================== */

#about p { text-align: justify; margin-bottom: 0.75rem; }

#disclaimer h2 { margin-top: 2.5rem; }
#disclaimer h3 { margin-top: 1.5rem; }

/* ========================================
   Contact page
   ======================================== */

.contact-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact-icon {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    width: 2rem;
    padding-top: 0.15rem;
}
.contact-icon img { width: 1.5rem; height: 1.5rem; }

.contact-icon-mail {
    font-size: 1.5rem;
    color: var(--text-muted);
    line-height: 1;
}

.contact-item a {
    color: var(--accent);
    text-decoration: none;
}
.contact-item a:hover { text-decoration: underline; }
.contact-item small { color: var(--text-muted); font-size: 0.78rem; }

/* ========================================
   QR Modal
   ======================================== */

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9000;
}

.modal-overlay[hidden] { display: none; }

.modal-content {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    max-width: 90vw;
    text-align: center;
}

.modal-qr {
    display: block;
    width: 220px;
    height: 220px;
    object-fit: contain;
    margin: 0 auto;
    cursor: pointer;
}

.modal-close {
    position: absolute;
    top: 0.5rem;
    right: 0.75rem;
    background: none;
    border: none;
    font-size: 1.4rem;
    line-height: 1;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0;
    font-family: var(--font-family);
}

.modal-close:hover { color: var(--text-primary); }

.modal-caption {
    margin-top: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
    word-break: break-all;
    max-width: 240px;
    cursor: pointer;
}

.addr-chunks {
    font-family: monospace;
    font-size: 0.72em;
    font-weight: bold;
    line-height: 1.8;
    display: block;
    text-align: center;
}

.addr-chunk--0 { color: var(--text-secondary); }
.addr-chunk--1 { color: var(--text-muted); }
.addr-chunk--0, .addr-chunk--1 { white-space: nowrap; display: inline-block; }

.addr-copy-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    margin: 0.75rem auto 0;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.78em;
    color: var(--text-muted);
    padding: 0;
    font-family: var(--font-family);
}

.addr-copy-btn:hover { color: var(--text-primary); }

/* ========================================
   Trust Badge Download Link (shared across tools)
   ======================================== */

.trust-download {
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
    padding: 0.2rem 0.6rem;
    border: 1px solid var(--accent);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    margin-left: auto;
}

.trust-download:hover {
    background: var(--accent);
    color: var(--accent-text);
}

/* ========================================
   Utility
   ======================================== */

.hidden { display: none !important; }

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 480px) {
    .header-inner { padding: 0.75rem 1rem; }
    .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; }
}

/* ========================================
   Accessibility
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}