/* SpracheKI – Layout & Design */

:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-on-accent: #ffffff;
    --accent-primary: #60a5fa;
    --accent-secondary: #93c5fd;
    --accent-tertiary: #bfdbfe;
    --accent-quaternary: #dbeafe;
    --accent-dark: #2563eb;
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.06);
    --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.08);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --max-width: 1200px;
    --sidebar-width: 260px;
    --header-height: 64px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
}

/* Header */
.header {
    position: relative;
    width: 100%;
    height: 180px;
    background: #e0f2fe;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.header-image {
    display: none;
}

.header-overlay {
    position: relative;
    z-index: 1;
    color: var(--text-primary);
    text-shadow: none;
}

.header-overlay h1 {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: var(--space-xs);
    letter-spacing: -0.02em;
}

.header-overlay p {
    font-size: 1.15rem;
    font-weight: 500;
    max-width: 600px;
    padding: 0 var(--space-md);
}

/* Header Logo & Claim v1.4 */
.header-logo {
    margin-bottom: var(--space-sm);
}

.header-logo-svg {
    height: 56px;
    width: auto;
    display: block;
    margin: 0 auto;
}

.header-claim {
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin: 0;
}

/* Navigation */
.nav-bar {
    background: var(--bg-secondary);
    padding: var(--space-sm) var(--space-lg);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-soft);
}

.nav-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

/* Navigation Language Indicator v1.4 */
.nav-language {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-flag {
    width: 24px;
    height: 18px;
    border-radius: 2px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
    flex-shrink: 0;
}

.nav-language-name {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1.05rem;
}

.footer-flag {
    display: inline-block;
    vertical-align: -2px;
    margin-right: 0.25rem;
    border-radius: 2px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}

.nav-links {
    display: flex;
    gap: var(--space-sm);
    margin-left: auto;
}

/* Mobile Menu Toggle v1.4 */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    margin-left: auto;
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: all 0.15s ease;
    font-size: 0.95rem;
}

.nav-link:hover {
    color: var(--accent-dark);
    background: var(--accent-quaternary);
}

.nav-link.active {
    color: var(--accent-dark);
    background: var(--accent-tertiary);
    font-weight: 500;
}

/* Language Navigation v1.4 */
.nav-link-language {
    font-weight: 700;
    color: var(--text-primary);
    position: relative;
}

.nav-link-language:hover {
    color: var(--accent-dark);
    background: var(--accent-quaternary);
}

.nav-link-language.active {
    color: var(--accent-dark);
    background: var(--accent-tertiary);
}

.nav-link-language.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 2px;
    background: var(--accent-dark);
    border-radius: 2px;
}

/* Main Layout */
.main-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-lg);
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    gap: var(--space-xl);
    align-items: start;
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: calc(var(--header-height) + var(--space-lg));
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-light);
}

.sidebar-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--border-light);
}

.sidebar-nav {
    list-style: none;
}

.sidebar-nav li {
    margin-bottom: 0.25rem;
}

.sidebar-link {
    display: block;
    padding: 0.5rem 0.75rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    transition: all 0.15s ease;
}

.sidebar-link:hover {
    background: var(--accent-quaternary);
    color: var(--accent-dark);
}

.sidebar-link.sidebar-link-sub {
    padding-left: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.sidebar-link.active {
    background: var(--accent-tertiary);
    color: var(--accent-dark);
    font-weight: 500;
}

/* Content */
.content {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-light);
}

.content section {
    margin-bottom: var(--space-xl);
    scroll-margin-top: calc(var(--header-height) + var(--space-lg));
}

.content h2 {
    font-size: 1.6rem;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-xs);
    border-bottom: 3px solid var(--accent-tertiary);
}

.section-intro {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    max-width: 800px;
}

.placeholder {
    color: var(--text-muted);
    font-style: italic;
    padding: var(--space-md);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--border-medium);
}

/* Info Box */
.info-box {
    background: var(--accent-quaternary);
    border-left: 4px solid var(--accent-dark);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
}

.info-box-title {
    font-weight: 700;
    color: var(--accent-dark);
    margin-bottom: var(--space-sm);
    font-size: 1.05rem;
}

.info-box p {
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.info-box ul {
    margin-left: var(--space-md);
    color: var(--text-secondary);
}

.info-box li {
    margin-bottom: 0.25rem;
}
.info-box li .example {
    display: inline-block;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: 0.15rem 0.5rem;
    margin-top: 0.35rem;
    margin-right: 0.35rem;
    font-size: 0.92rem;
    color: var(--text-primary);
}


/* Vocabulary Table */
.table-container {
    overflow-x: auto;
}

.vocab-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 1rem;
}

.vocab-table thead {
    background: var(--accent-quaternary);
}

.vocab-table th,
.vocab-table td {
    padding: 0.85rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
    vertical-align: top;
}

.vocab-table th {
    font-weight: 600;
    color: var(--accent-dark);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.vocab-table tbody tr:hover {
    background: var(--bg-primary);
}

.vocab-table tbody tr:last-child td {
    border-bottom: none;
}

.col-cyrillic {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-dark);
    white-space: nowrap;
}

.col-roman {
    color: var(--text-secondary);
    font-style: italic;
    white-space: nowrap;
}

.col-de {
    font-weight: 500;
}

.col-note {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.error {
    color: #dc2626;
    padding: var(--space-md);
    background: #fef2f2;
    border-radius: var(--radius-md);
    border-left: 4px solid #dc2626;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    position: relative;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    width: 100%;
    max-width: 720px;
    max-height: 90vh;
    overflow-y: auto;
    z-index: 1001;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-light);
}

.modal-header h3 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    transition: color 0.2s, background 0.2s;
}

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

.modal-body {
    padding: var(--space-lg);
}

.conjugation-tense {
    margin-bottom: var(--space-lg);
}

.conjugation-tense:last-child {
    margin-bottom: 0;
}

.conjugation-tense h4 {
    font-size: 1.1rem;
    color: var(--accent-dark);
    margin-bottom: var(--space-sm);
}

.conjugation-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.conjugation-table th,
.conjugation-table td {
    padding: 0.6rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.conjugation-table th {
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-weight: 600;
}

.conjugation-table td[lang="bg"] {
    font-weight: 600;
}

.conjugation-table .person-col {
    width: 25%;
    color: var(--text-secondary);
}

.conjugation-table .bg-col {
    width: 40%;
}

.conjugation-table .roman-col {
    width: 35%;
    font-style: italic;
    color: var(--text-secondary);
}

.modal-placeholder {
    color: var(--text-secondary);
    font-style: italic;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--space-xl) var(--space-lg);
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-light);
    margin-top: var(--space-xl);
}


/* Satzbau Beispiele */
.sentence-pattern {
    background: var(--bg-primary);
    border-left: 4px solid var(--accent-dark);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
}

.sentence-pattern h4 {
    font-size: 1.1rem;
    color: var(--accent-dark);
    margin-bottom: var(--space-sm);
}

.sentence-pattern p[lang="bg"] {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.sentence-roman {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.sentence-de {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.sentence-de:last-child {
    margin-bottom: 0;
}

.content h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

/* Responsive */
@media (max-width: 900px) {
    .main-container {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
    }

    .sidebar-nav {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .sidebar-nav li {
        margin-bottom: 0;
    }

    .vocab-table th,
    .vocab-table td {
        padding: 0.65rem 0.75rem;
    }

    .col-note {
        display: none;
    }
}

@media (max-width: 500px) {
    /* Mobile Navigation v1.4 */
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: var(--space-md);
        box-shadow: var(--shadow-soft);
        border-bottom: 1px solid var(--border-light);
        z-index: 99;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links .nav-link,
    .nav-links .lang-link {
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    .language-switcher {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        margin-top: var(--space-sm);
        padding-top: var(--space-sm);
        border-top: 1px solid var(--border-light);
    }

    .header {
        height: 160px;
    }

    .header-overlay h1 {
        font-size: 1.8rem;
    }

    .header-overlay p {
        font-size: 1rem;
    }

    .content {
        padding: var(--space-md);
    }

    .col-note {
        display: none;
    }

    /* Mobile Optimizations v1.4 */
    .landing-logo .logo-svg {
        height: 40px;
    }

    .header-logo-svg {
        height: 40px;
    }

    .header-claim {
        font-size: 0.95rem;
    }

    .nav-language-name {
        font-size: 0.95rem;
    }

    .nav-flag {
        width: 20px;
        height: 15px;
    }

    .footer p,
    .landing-footer p {
        font-size: 0.75rem;
        line-height: 1.4;
        word-break: break-word;
    }

    .footer-flag {
        width: 16px;
        height: 12px;
    }

    .nav-link,
    .lang-link,
    .sidebar-link {
        min-height: 44px;
        display: inline-flex;
        align-items: center;
    }

    .language-option {
        padding: 0.875rem 1rem;
    }

    .example-sentence {
        flex-direction: column;
        gap: 0.5rem;
    }

    .example-sentence-number {
        width: 1.5rem;
        height: 1.5rem;
        font-size: 0.8rem;
    }

    .modal-overlay {
        padding: 0;
    }

    .modal-content {
        width: 100%;
        height: 100%;
        max-height: 100vh;
        border-radius: 0;
        padding: var(--space-md);
    }

    .vocab-table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .vocab-table {
        min-width: 400px;
    }
}


/* Verb group headings */
.verb-group-heading {
    font-size: 1.15rem;
    color: var(--accent-dark);
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
    padding-bottom: var(--space-xs);
    border-bottom: 2px solid var(--accent-tertiary);
}

.verb-group-heading:first-child {
    margin-top: 0;
}


/* Irregular verb badge */
.verb-irregular-badge {
    display: inline-block;
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #f59e0b;
    border-radius: 999px;
    padding: 0.15rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 0.35rem;
    white-space: nowrap;
}


/* Language switcher */
.language-switcher {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    margin-left: 0.75rem;
    padding-left: 0.75rem;
    border-left: 1px solid var(--border-light);
}

.lang-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.2rem 0.4rem;
    border-radius: var(--radius-sm);
    transition: all 0.15s ease;
}

.lang-link:hover {
    color: var(--accent-dark);
    background: var(--accent-quaternary);
}

.lang-link.active {
    color: var(--accent-dark);
    background: var(--accent-tertiary);
}

.lang-separator {
    color: var(--text-muted);
    font-size: 0.8rem;
}



/* Landing page */
body.landing-page {
    background: linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
}

.landing-container {
    width: 100%;
    max-width: 520px;
    text-align: center;
}

.landing-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-light);
}

.landing-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--accent-dark);
    margin-bottom: var(--space-md);
}

.landing-logo .logo-svg {
    height: 48px;
    width: auto;
    display: block;
}

.landing-logo .nav-logo-flag {
    width: 2rem;
    height: 1.5rem;
    border-radius: 4px;
}

.landing-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.landing-subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.6;
    margin-bottom: var(--space-lg);
}

.landing-divider {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin: var(--space-lg) 0;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.landing-divider::before,
.landing-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-light);
}

.language-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.language-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    transition: all 0.15s ease;
}

.language-card:hover {
    background: var(--accent-quaternary);
    border-color: var(--accent-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
}

.language-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.language-flag {
    border-radius: 3px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.language-name {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.language-flags {
    display: flex;
    gap: var(--space-sm);
}

.language-flag-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    transition: all 0.15s ease;
    border: 1px solid var(--border-light);
    background: var(--bg-secondary);
}

.language-flag-link:hover {
    background: var(--accent-quaternary);
    border-color: var(--accent-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
}

.flag-icon {
    border-radius: 2px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12);
}

.language-option {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.15s ease;
}

.language-option:hover {
    background: var(--accent-quaternary);
    border-color: var(--accent-tertiary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
}

.language-option:hover .language-name {
    color: var(--accent-dark);
}

.language-name {
    font-weight: 700;
    font-size: 1.1rem;
    transition: color 0.15s ease;
}

.language-hint {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.landing-footer {
    margin-top: var(--space-lg);
    color: var(--text-muted);
    font-size: 0.85rem;
}

@media (max-width: 480px) {
    .landing-title {
        font-size: 1.6rem;
    }

    .landing-card {
        padding: var(--space-lg);
    }

    .language-option {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.15rem;
    }

    .language-card {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }

    .language-flags {
        width: 100%;
        justify-content: flex-end;
    }

    /* Extra kompakt für sehr kleine Screens v1.4 */
    .landing-logo .logo-svg {
        height: 36px;
    }

    .header-logo-svg {
        height: 32px;
    }

    .header-claim {
        font-size: 0.85rem;
    }

    .nav-language-name {
        font-size: 0.85rem;
    }

    .nav-flag {
        width: 18px;
        height: 13px;
    }

    .header-overlay h1 {
        font-size: 1.5rem;
    }

    .header-overlay p {
        font-size: 0.9rem;
    }
}

/* Example sentences in modal */
.example-sentence {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--border-light);
}

.example-sentence:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.example-sentence-number {
    flex-shrink: 0;
    width: 1.75rem;
    height: 1.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-primary);
    color: var(--text-on-accent);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.9rem;
}

.example-sentence-content {
    flex: 1;
}

.example-sentence-bg {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-dark);
    margin-bottom: 0.25rem;
}

.example-sentence-roman {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.example-sentence-translation {
    color: var(--text-primary);
}