:root {
    --navy: #0d1b2a;
    --navy-light: #1b2838;
    --navy-lighter: #243447;
    --amber: #e6a817;
    --amber-light: #f5d061;
    --amber-dark: #b8860b;
    --white: #ffffff;
    --off-white: #f5f6f8;
    --light-gray: #e2e4e8;
    --mid-gray: #6b7280;
    --dark-gray: #374151;
    --text: #1f2937;
    --border: #d1d5db;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 20px rgba(0,0,0,0.12);
    --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', 'Courier New', monospace;
}

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

body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--off-white);
    color: var(--text);
    line-height: 1.7;
    font-size: 16px;
}

/* ── Header ─────────────────────────────────────────── */
header {
    background-color: var(--navy);
    color: var(--white);
    border-bottom: 3px solid var(--amber);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.75rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.header-brand {
    display: flex;
    align-items: baseline;
    gap: 12px;
}

.header-logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    color: var(--amber);
}

.header-subtitle {
    font-size: 0.85rem;
    opacity: 0.75;
    font-weight: 400;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

nav a {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: color 0.15s;
}

nav a:hover {
    color: var(--amber);
}

/* ── Hero ───────────────────────────────────────────── */
.hero {
    background: linear-gradient(160deg, var(--navy) 0%, var(--navy-light) 40%, #15293e 100%);
    color: var(--white);
    padding: 5rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(230,168,23,0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(230,168,23,0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--amber);
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
}

.hero-content h2 {
    font-size: 1.5rem;
    font-weight: 400;
    color: rgba(255,255,255,0.85);
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.05rem;
    opacity: 0.7;
    max-width: 600px;
    margin: 0 auto;
}

/* ── E-E-A-T Header ─────────────────────────────────── */
.eeat-header {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--mid-gray);
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.75rem;
    line-height: 1.5;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

/* ── Container ──────────────────────────────────────── */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.bg-light {
    background-color: var(--white);
    border-top: 1px solid var(--light-gray);
    border-bottom: 1px solid var(--light-gray);
}

.bg-dark {
    background: linear-gradient(160deg, var(--navy) 0%, var(--navy-light) 100%);
    color: var(--white);
}

.bg-dark h2 {
    color: var(--amber) !important;
}

.bg-dark .accent-bar {
    background-color: var(--amber) !important;
}

/* ── Section Headings ───────────────────────────────── */
h2 {
    font-size: 1.75rem;
    color: var(--navy);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    font-weight: 800;
}

.accent-bar {
    display: inline-block;
    width: 8px;
    height: 30px;
    background-color: var(--amber);
    margin-right: 14px;
    border-radius: 4px;
}

h3 {
    font-size: 1.15rem;
    color: var(--navy-light);
    margin-bottom: 0.75rem;
    font-weight: 700;
}

/* ── Abstract Box ───────────────────────────────────── */
.abstract-box {
    background: var(--white);
    border-left: 5px solid var(--amber);
    padding: 1.5rem 2rem;
    box-shadow: var(--shadow);
    border-radius: 0 6px 6px 0;
}

.abstract-box p {
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

.abstract-box p:last-child {
    margin-bottom: 0;
}

/* ── Content Split ──────────────────────────────────── */
.content-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.content-split .text {
    font-size: 1rem;
}

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

/* ── Bullet Lists ───────────────────────────────────── */
.bullet-list {
    list-style: none;
    padding: 0;
}

.bullet-list li {
    padding: 0.35rem 0 0.35rem 1.5rem;
    position: relative;
}

.bullet-list li::before {
    content: "\25B8";
    color: var(--amber-dark);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* ── Step List ──────────────────────────────────────── */
.step-list {
    list-style: none;
    padding: 0;
    counter-reset: step;
}

.step-list li {
    counter-increment: step;
    padding: 0.5rem 0 0.5rem 2.5rem;
    position: relative;
}

.step-list li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0.4rem;
    width: 26px;
    height: 26px;
    background: var(--amber);
    color: var(--navy);
    font-weight: 800;
    font-size: 0.8rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ── Diagram Box ────────────────────────────────────── */
.diagram-box {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    border: 1px solid var(--light-gray);
}

.diagram-caption {
    text-align: center;
    font-size: 0.8rem;
    color: var(--mid-gray);
    margin-top: 0.75rem;
    font-style: italic;
}

/* ── Flow Diagram ───────────────────────────────────── */
.flow-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.flow-diagram.reverse {
    opacity: 0.7;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px dashed var(--border);
}

.flow-node {
    background: var(--navy);
    color: var(--white);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 700;
    text-align: center;
    line-height: 1.4;
}

.flow-node small {
    display: block;
    font-weight: 400;
    opacity: 0.75;
    font-size: 0.75rem;
}

.flow-node.error {
    background: #7f1d1d;
}

.flow-arrow {
    font-size: 1.5rem;
    color: var(--amber);
    font-weight: bold;
}

/* ── Loop Diagram ───────────────────────────────────── */
.loop-diagram {
    width: 200px;
    height: 200px;
    margin: 0 auto 0.5rem;
    border: 3px solid var(--amber);
    border-radius: 50%;
    position: relative;
    background: radial-gradient(circle at center, rgba(230,168,23,0.08), transparent 70%);
}

.loop-node {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--navy);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 800;
    font-size: 0.9rem;
    text-align: center;
}

.loop-label {
    position: absolute;
    font-size: 0.75rem;
    color: var(--dark-gray);
    font-weight: 600;
}

.loop-label.top {
    top: -1.2rem;
    left: 50%;
    transform: translateX(-50%);
}

.loop-label.right {
    right: -4.5rem;
    top: 50%;
    transform: translateY(-50%);
}

.loop-label.bottom {
    bottom: -1.2rem;
    left: 50%;
    transform: translateX(-50%);
}

.loop-iteration {
    margin-top: 0.5rem;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--dark-gray);
    font-weight: 600;
}

.loop-iteration span {
    color: var(--amber-dark);
}

/* ── XOR Diagram ────────────────────────────────────── */
.xor-diagram {
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.xor-row {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--light-gray);
}

.xor-row:last-child {
    border-bottom: none;
}

.xor-op {
    color: var(--amber-dark);
    font-weight: bold;
    font-size: 1.1rem;
}

/* ── Highlight Box ──────────────────────────────────── */
.highlight-box {
    margin-top: 2rem;
    background: linear-gradient(135deg, rgba(230,168,23,0.08), rgba(230,168,23,0.03));
    border-left: 4px solid var(--amber);
    padding: 1rem 1.5rem;
    border-radius: 0 6px 6px 0;
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ── Cards ──────────────────────────────────────────── */
.cards-three {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.cards-two {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--amber);
}

.card h3 {
    color: var(--navy);
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    font-weight: 700;
}

.card p {
    font-size: 0.93rem;
    line-height: 1.7;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.card p:last-child {
    margin-bottom: 0;
}

.card-subtitle {
    font-size: 0.8rem !important;
    color: var(--mid-gray) !important;
    font-style: italic;
    margin-top: -0.5rem;
    margin-bottom: 0.75rem !important;
}

.card .bullet-list {
    font-size: 0.93rem;
}

/* ── Section Intro ──────────────────────────────────── */
.section-intro {
    font-size: 1rem;
    color: var(--dark-gray);
    margin-bottom: 1.5rem;
    max-width: 700px;
}

/* ── Table ──────────────────────────────────────────── */
.table-wrapper {
    background: var(--white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    overflow-x: auto;
}

.compare-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.compare-table thead th {
    background-color: var(--navy);
    color: var(--white);
    padding: 14px 18px;
    text-align: left;
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.compare-table thead th:first-child {
    width: 220px;
}

.compare-table tbody td {
    padding: 12px 18px;
    border-bottom: 1px solid var(--border);
}

.compare-table tbody tr:nth-child(even) {
    background-color: rgba(13,27,42,0.03);
}

.compare-table tbody tr:hover {
    background-color: rgba(230,168,23,0.06);
}

.compare-table tbody td:first-child {
    font-weight: 700;
    color: var(--navy);
}

/* ── Roadmap ────────────────────────────────────────── */
.roadmap {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.roadmap-item {
    background: var(--white);
    border-radius: 8px;
    box-shadow: var(--shadow);
    overflow: hidden;
    display: flex;
}

.roadmap-phase {
    background: var(--amber);
    color: var(--navy);
    font-weight: 800;
    font-size: 0.85rem;
    padding: 1.25rem 1rem;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 1px;
    text-align: center;
    min-width: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.roadmap-content {
    padding: 1.25rem 1.5rem;
    flex: 1;
}

.roadmap-content strong {
    display: block;
    font-size: 1rem;
    color: var(--navy);
    margin-bottom: 0.4rem;
}

.roadmap-content p {
    font-size: 0.88rem;
    line-height: 1.6;
    color: var(--dark-gray);
    margin: 0;
}

/* ── Conclusion ─────────────────────────────────────── */
.conclusion-text {
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1.25rem;
    max-width: 900px;
    color: rgba(255,255,255,0.85);
}

.conclusion-bold {
    font-weight: 700;
    color: var(--amber-light);
    font-size: 1.1rem;
    border-left: 3px solid var(--amber);
    padding-left: 1.5rem;
}

/* ── Callout Box ────────────────────────────────────── */
.callout-box {
    background: var(--white);
    border: 2px solid var(--amber);
    border-radius: 8px;
    padding: 1.5rem 2rem;
    text-align: center;
    box-shadow: var(--shadow);
}

.callout-box h3 {
    color: var(--amber-dark);
    margin-bottom: 0.75rem;
    font-size: 1.15rem;
}

.callout-box p {
    max-width: 700px;
    margin: 0 auto;
    color: var(--dark-gray);
    font-size: 0.95rem;
}

/* ── Footer ─────────────────────────────────────────── */
footer {
    background-color: var(--navy);
    color: rgba(255,255,255,0.6);
    text-align: center;
    padding: 2rem;
    font-size: 0.85rem;
    line-height: 1.7;
    border-top: 3px solid var(--amber);
}

footer a {
    color: var(--amber);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.footer-impressum {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    line-height: 1.7;
}

.footer-impressum strong {
    color: var(--white);
}

.footer-note {
    font-size: 0.78rem;
    margin-top: 0.75rem;
    opacity: 0.5;
}

/* ── Responsive ─────────────────────────────────────── */
@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        text-align: center;
    }
    .header-brand {
        flex-direction: column;
        align-items: center;
        gap: 4px;
    }
    nav ul {
        justify-content: center;
        gap: 14px;
    }
    .hero {
        padding: 3rem 1rem;
    }
    .hero-content h1 {
        font-size: 2.2rem;
    }
    .hero-content h2 {
        font-size: 1.15rem;
    }
    .container {
        padding: 2rem 1rem;
    }
    h2 {
        font-size: 1.35rem;
    }
    .content-split {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .cards-three, .cards-two, .roadmap {
        grid-template-columns: 1fr;
    }
    .compare-table {
        font-size: 0.78rem;
    }
    .compare-table thead th,
    .compare-table tbody td {
        padding: 8px 10px;
    }
    .abstract-box {
        padding: 1rem 1.25rem;
    }
    .roadmap-phase {
        writing-mode: horizontal-tb;
        min-width: auto;
        padding: 0.5rem 1rem;
    }
    .roadmap-item {
        flex-direction: column;
    }
}