/* ====================================
   KI-LEXIKON – STATE-OF-THE-ART STYLES
   KI BIBEL Design System
   ==================================== */

:root {
    --bg-deep: #020617;
    --bg-surface: #0f172a;
    --bg-card: rgba(15, 23, 42, 0.85);
    --bg-card-hover: rgba(30, 41, 59, 0.85);
    --bg-nav: rgba(2, 6, 23, 0.92);
    --accent-cyan: #0ea5e9;
    --accent-purple: #a855f7;
    --accent-pink: #ec4899;
    --text-main: #f8fafc;
    --text-dim: #94a3b8;
    --text-muted: #64748b;
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-border-hover: rgba(255, 255, 255, 0.15);
    --glow-cyan: rgba(14, 165, 233, 0.35);
    --glow-purple: rgba(168, 85, 247, 0.25);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-deep);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Background effects */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background:
        radial-gradient(ellipse at 10% 10%, rgba(168, 85, 247, 0.07) 0%, transparent 50%),
        radial-gradient(ellipse at 90% 90%, rgba(14, 165, 233, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(236, 72, 153, 0.03) 0%, transparent 60%);
    animation: bgPulse 20s ease-in-out infinite alternate;
    pointer-events: none;
}

@keyframes bgPulse {
    0% {
        opacity: 0.5;
    }

    100% {
        opacity: 1;
    }
}

.container {
    width: 92%;
    max-width: 1200px;
    margin: 0 auto;
}

.page-wrapper {
    flex: 1;
}

/* Gradient text */
.gradient-text {
    background: linear-gradient(135deg, #fff 20%, var(--accent-cyan) 60%, var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==============================
   NAVIGATION
   ============================== */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-nav);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 0.8rem 0;
}

.nav-inner {
    width: 92%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: -1.5px;
}

.nav-logo a {
    text-decoration: none;
    color: var(--text-main);
}

.nav-logo span {
    color: var(--accent-cyan);
    text-shadow: 0 0 20px var(--glow-cyan);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--text-dim);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: color 0.3s;
    padding: 0.4rem 0;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-main);
}

/* ==============================
   PAGE HEADER
   ============================== */
.page-header {
    text-align: center;
    padding: 5rem 0 4rem;
    position: relative;
}

.header-badge {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    background: rgba(168, 85, 247, 0.1);
    color: var(--accent-purple);
    border: 1px solid rgba(168, 85, 247, 0.25);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1.5rem;
}

.page-header h1 {
    font-size: clamp(2.8rem, 6vw, 4.2rem);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -0.04em;
    margin-bottom: 1.2rem;
}

.subtitle {
    font-size: 1.15rem;
    color: var(--text-dim);
    max-width: 540px;
    margin: 0 auto 1.5rem;
    font-weight: 400;
    line-height: 1.7;
}

.term-count {
    display: inline-block;
    padding: 0.3rem 1rem;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent-cyan);
    border: 1px solid rgba(14, 165, 233, 0.2);
    background: rgba(14, 165, 233, 0.05);
}

/* ==============================
   SEARCH
   ============================== */
.search-wrapper {
    margin-bottom: 1.5rem;
    position: sticky;
    top: 60px;
    z-index: 50;
    padding: 1rem 0;
    background: rgba(2, 6, 23, 0.8);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
}

.search-container {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-icon {
    position: absolute;
    left: 1.2rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

#search-input {
    width: 100%;
    padding: 1rem 3rem 1rem 3.5rem;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    color: var(--text-main);
    font-size: 1.05rem;
    font-family: inherit;
    font-weight: 500;
    outline: none;
    transition: border-color 0.3s, box-shadow 0.3s;
}

#search-input:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1), 0 4px 20px rgba(14, 165, 233, 0.1);
}

#search-input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

#search-clear {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--text-muted);
    padding: 0.3rem;
    transition: color 0.3s;
    line-height: 0;
}

#search-clear:hover {
    color: var(--text-main);
}

.search-stats {
    text-align: center;
    margin-top: 0.6rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ==============================
   FILTER TOGGLE (collapsible)
   ============================== */
.filter-toggle {
    margin-bottom: 1.5rem;
}

.filter-toggle-btn {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    justify-content: center;
    padding: 0.7rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-dim);
    transition: all 0.3s;
    list-style: none;
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
}

.filter-toggle-btn::-webkit-details-marker {
    display: none;
}

.filter-toggle-btn:hover {
    color: var(--text-main);
    border-color: var(--glass-border-hover);
}

.filter-toggle[open] .filter-toggle-btn {
    color: var(--accent-cyan);
    border-color: rgba(14, 165, 233, 0.3);
    margin-bottom: 1rem;
}

.filter-chevron {
    transition: transform 0.3s;
    margin-left: auto;
}

.filter-toggle[open] .filter-chevron {
    transform: rotate(180deg);
}

.filter-content {
    animation: filterSlide 0.3s ease-out;
}

@keyframes filterSlide {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==============================
   ALPHABET NAV
   ============================== */
.alphabet-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    justify-content: center;
    padding: 0.5rem 0 1.5rem;
}

.alpha-btn {
    padding: 0.3rem 0.65rem;
    font-size: 0.8rem;
    font-weight: 700;
    font-family: inherit;
    background: transparent;
    color: var(--text-muted);
    border: 1px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.alpha-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.04);
}

.alpha-btn.active {
    color: var(--accent-cyan);
    background: rgba(14, 165, 233, 0.08);
    border-color: rgba(14, 165, 233, 0.25);
}

.alpha-btn.disabled {
    opacity: 0.25;
    cursor: default;
    pointer-events: none;
}

/* ==============================
   CATEGORY FILTERS
   ============================== */
.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    padding-bottom: 2rem;
}

.cat-chip {
    padding: 0.35rem 0.9rem;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: inherit;
    background: rgba(168, 85, 247, 0.06);
    color: var(--text-dim);
    border: 1px solid rgba(168, 85, 247, 0.15);
    border-radius: 100px;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.cat-chip:hover {
    color: var(--accent-purple);
    border-color: rgba(168, 85, 247, 0.4);
    background: rgba(168, 85, 247, 0.1);
}

.cat-chip.active {
    color: var(--accent-purple);
    background: rgba(168, 85, 247, 0.15);
    border-color: var(--accent-purple);
}

/* ==============================
   TERMS GRID
   ============================== */
.terms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.2rem;
    padding-bottom: 2rem;
}

.term-card {
    position: relative;
    display: block;
    padding: 1.8rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    text-decoration: none;
    color: inherit;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    overflow: hidden;
    animation: cardIn 0.5s ease-out both;
}

.term-card:nth-child(1) {
    animation-delay: 0.02s;
}

.term-card:nth-child(2) {
    animation-delay: 0.06s;
}

.term-card:nth-child(3) {
    animation-delay: 0.10s;
}

.term-card:nth-child(4) {
    animation-delay: 0.14s;
}

.term-card:nth-child(5) {
    animation-delay: 0.18s;
}

.term-card:nth-child(6) {
    animation-delay: 0.22s;
}

.term-card:nth-child(7) {
    animation-delay: 0.26s;
}

.term-card:nth-child(8) {
    animation-delay: 0.30s;
}

.term-card:nth-child(9) {
    animation-delay: 0.34s;
}

@keyframes cardIn {
    from {
        opacity: 0;
        transform: translateY(25px) scale(0.96);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.term-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    opacity: 0;
    transition: opacity 0.4s;
}

.term-card .card-glow {
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(14, 165, 233, 0.04), transparent 60%);
    opacity: 0;
    transition: opacity 0.4s;
    pointer-events: none;
}

.term-card:hover {
    transform: translateY(-8px);
    border-color: var(--glass-border-hover);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3), 0 0 25px var(--glow-purple);
}

.term-card:hover::before {
    opacity: 1;
}

.term-card:hover .card-glow {
    opacity: 1;
}

.term-category {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent-purple);
    font-weight: 700;
    margin-bottom: 0.6rem;
}

.term-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.6rem;
    color: var(--text-main);
    line-height: 1.3;
}

.term-preview {
    font-size: 0.88rem;
    color: var(--text-dim);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Highlight in search */
mark {
    background: rgba(14, 165, 233, 0.25);
    color: var(--accent-cyan);
    padding: 0 2px;
    border-radius: 3px;
}

/* ==============================
   LOAD MORE
   ============================== */
.btn-load-more {
    padding: 0.8rem 2.5rem;
    background: transparent;
    color: var(--accent-cyan);
    border: 1.5px solid rgba(14, 165, 233, 0.3);
    border-radius: 14px;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-load-more:hover {
    background: rgba(14, 165, 233, 0.08);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 20px rgba(14, 165, 233, 0.15);
}

/* ==============================
   NO RESULTS
   ============================== */
#no-results {
    display: none;
    text-align: center;
    padding: 4rem 2rem;
}

#no-results p {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

#reset-search {
    padding: 0.7rem 2rem;
    background: transparent;
    color: var(--accent-cyan);
    border: 1.5px solid rgba(14, 165, 233, 0.3);
    border-radius: 12px;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
}

#reset-search:hover {
    background: rgba(14, 165, 233, 0.08);
    border-color: var(--accent-cyan);
}

/* ==============================
   DETAIL VIEW
   ============================== */
.detail-container {
    padding: 3rem 0 6rem;
    max-width: 800px;
}

.breadcrumb {
    padding: 0 0 2rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.3s;
}

.breadcrumb a:hover {
    color: var(--accent-cyan);
}

.breadcrumb .sep {
    margin: 0 0.5rem;
    color: var(--text-muted);
}

.breadcrumb .current {
    color: var(--text-main);
}

.term-detail {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 3rem;
    position: relative;
    overflow: hidden;
}

.term-detail::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple), var(--accent-pink));
}

.detail-header {
    margin-bottom: 2rem;
}

.detail-category {
    display: inline-block;
    padding: 0.3rem 0.9rem;
    background: rgba(168, 85, 247, 0.1);
    color: var(--accent-purple);
    border: 1px solid rgba(168, 85, 247, 0.25);
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 1rem;
}

.detail-title {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.detail-content {
    font-size: 1.05rem;
    color: var(--text-dim);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.detail-content p {
    margin-bottom: 1rem;
}

/* Tags */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.tag {
    padding: 0.25rem 0.8rem;
    background: rgba(14, 165, 233, 0.06);
    color: var(--accent-cyan);
    border: 1px solid rgba(14, 165, 233, 0.15);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Related terms */
.related-terms {
    margin-bottom: 2.5rem;
}

.related-terms h3 {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.related-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.related-link {
    padding: 0.4rem 1rem;
    background: rgba(168, 85, 247, 0.06);
    color: var(--accent-purple);
    border: 1px solid rgba(168, 85, 247, 0.2);
    border-radius: 10px;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.3s;
}

.related-link:hover {
    background: rgba(168, 85, 247, 0.15);
    border-color: var(--accent-purple);
    transform: translateY(-2px);
}

/* Back button */
.detail-back {
    padding-top: 1rem;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-cyan);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    transition: all 0.3s;
}

.btn-back:hover {
    gap: 0.8rem;
}

/* ==============================
   COOKIE BANNER
   ============================== */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    background: rgba(15, 23, 42, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--glass-border);
    padding: 1.5rem 2rem;
    transform: translateY(100%);
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.cookie-banner.visible {
    transform: translateY(0);
}

.cookie-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    flex-wrap: wrap;
}

.cookie-text {
    flex: 1;
    min-width: 260px;
}

.cookie-text p {
    color: var(--text-dim);
    font-size: 0.9rem;
    line-height: 1.5;
}

.cookie-text a {
    color: var(--accent-cyan);
    text-decoration: underline;
}

.cookie-actions {
    display: flex;
    gap: 0.8rem;
    flex-shrink: 0;
}

.cookie-btn {
    padding: 0.7rem 1.5rem;
    border-radius: 10px;
    border: none;
    font-family: inherit;
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s;
}

.cookie-accept {
    background: var(--accent-cyan);
    color: #000;
}

.cookie-accept:hover {
    background: #fff;
}

.cookie-reject {
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--glass-border);
}

.cookie-reject:hover {
    border-color: var(--text-dim);
    color: var(--text-main);
}

/* ==============================
   FOOTER
   ============================== */
.site-footer {
    border-top: 1px solid var(--glass-border);
    padding: 3rem 0 2rem;
    margin-top: 3rem;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.footer-logo {
    font-size: 1.3rem;
    font-weight: 900;
    letter-spacing: -1px;
    margin-bottom: 0.5rem;
}

.footer-logo span {
    color: var(--accent-cyan);
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: color 0.3s;
}

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

.footer-copy {
    color: var(--text-muted);
    font-size: 0.8rem;
    text-align: center;
}

/* ==============================
   RESPONSIVE
   ============================== */
@media (max-width: 768px) {
    .terms-grid {
        grid-template-columns: 1fr;
    }

    .term-detail {
        padding: 2rem 1.5rem;
    }

    .alphabet-nav {
        gap: 0.2rem;
        padding: 0.5rem 0 1rem;
    }

    .alpha-btn {
        padding: 0.25rem 0.45rem;
        font-size: 0.7rem;
    }

    .search-wrapper {
        top: 52px;
    }

    .alphabet-nav {
        top: 120px;
    }

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }

    .cookie-inner {
        flex-direction: column;
        text-align: center;
    }

    .cookie-actions {
        justify-content: center;
    }

    .nav-links {
        gap: 1rem;
    }

    .nav-link {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .page-header {
        padding: 3.5rem 0 2.5rem;
    }

    .page-header h1 {
        font-size: 2.4rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .detail-title {
        font-size: 1.6rem;
    }

    .category-filters {
        gap: 0.3rem;
    }

    .cat-chip {
        font-size: 0.65rem;
        padding: 0.3rem 0.7rem;
    }
}