/* ============================================
   MCP Security Slides
   Deutsche Telekom Magenta Theme
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --magenta: #E20074;
    --magenta-dark: #a80055;
    --magenta-light: #ff3399;
    --magenta-glow: rgba(226, 0, 116, 0.3);
    --bg-dark: #0a0a14;
    --bg-section: #0d0d1a;
    --bg-card: #1a1a2e;
    --bg-card-hover: #222244;
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b8;
    --text-muted: #8888a2;
    --green: #00A8A0;
    --green-glow: rgba(0, 168, 160, 0.3);
    --blue: #0099D8;
    --blue-glow: rgba(0, 153, 216, 0.3);
    --red: #ff4466;
    --orange: #E86D0F;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font);
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Progress Nav --- */
.progress-nav {
    position: fixed;
    right: 28px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.progress-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-muted);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    border: none;
    padding: 0;
}

.progress-dot.active {
    background: var(--magenta);
    box-shadow: 0 0 12px var(--magenta-glow);
    transform: scale(1.3);
}

.progress-label {
    position: absolute;
    right: 22px;
    top: 50%;
    transform: translateY(-50%);
    white-space: nowrap;
    font-size: 10px;
    font-weight: 500;
    color: var(--text-secondary);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    background: var(--bg-card);
    border: 1px solid rgba(128,128,128,0.2);
    padding: 3px 8px;
    border-radius: 4px;
}

.progress-dot:hover .progress-label,
.progress-dot.active .progress-label {
    opacity: 1;
}

/* --- Sections --- */
.section {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 70px 40px;
}

.section-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}

/* --- Grid Background --- */
.grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(226, 0, 116, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(226, 0, 116, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

/* --- Content Layouts --- */
.content {
    position: relative;
    z-index: 1;
    max-width: 1350px;
    width: 100%;
    margin: 0 auto;
}

.content-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.content-center {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* --- Typography --- */
h1 {
    font-size: clamp(4.2rem, 8.4vw, 7.2rem);
    font-weight: 900;
    line-height: 1.05;
    margin-bottom: 24px;
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(3.6rem, 6.6vw, 5.4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

h3 {
    font-size: 2.3rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

p {
    color: var(--text-secondary);
    font-size: 1.8rem;
    margin-bottom: 16px;
}

.lead {
    font-size: 2.4rem;
    color: var(--text-secondary);
    max-width: 950px;
    margin-bottom: 16px;
    line-height: 1.6;
}

.text-gradient {
    background: linear-gradient(135deg, var(--magenta) 0%, var(--magenta-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-label {
    display: inline-block;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--magenta);
    margin-bottom: 20px;
    padding: 5px 14px;
    border: 1px solid rgba(226, 0, 116, 0.3);
    border-radius: 20px;
    background: rgba(226, 0, 116, 0.05);
}

/* Larger conference label on title slide */
#conf-label {
    font-size: 1.4rem;
    padding: 12px 32px;
    top: 72px !important;
}

strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* --- Glow Orbs --- */
.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.12;
    pointer-events: none;
}

.glow-orb-1 {
    width: 500px;
    height: 500px;
    background: var(--magenta);
    top: -10%;
    left: -10%;
}

.glow-orb-2 {
    width: 350px;
    height: 350px;
    background: var(--blue);
    bottom: -5%;
    right: -5%;
}

.glow-orb-3 {
    width: 300px;
    height: 300px;
    background: var(--green);
    top: 30%;
    right: 10%;
}

/* --- Hero Section --- */
.section-hero {
    text-align: center;
    align-items: center;
    justify-content: center;
}

.hero-title {
    font-size: clamp(6rem, 10.8vw, 9.6rem);
    margin-bottom: 16px;
    line-height: 1;
    white-space: nowrap;
}

.hero-subtitle {
    font-size: clamp(2.2rem, 3.6vw, 3.1rem);
    color: var(--text-secondary);
    max-width: 1080px;
    margin: 0 auto 0;
    line-height: 1.4;
    font-weight: 400;
}

.presenter-badge {
    position: absolute;
    bottom: 44px;
    left: 50%;
    transform: translateX(-50%);
    white-space: nowrap;
    padding: 14px 36px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.04);
    display: inline-block;
    font-size: 1.55rem;
    color: var(--text-muted);
    line-height: 1.7;
    z-index: 1;
}

.presenter-badge strong {
    font-size: 1.7rem;
    color: var(--text-secondary);
}

/* --- Scroll Hint --- */
.scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.72rem;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    animation: pulse-hint 2s ease-in-out infinite;
}

.scroll-arrow {
    width: 22px;
    height: 22px;
    border-right: 2px solid var(--text-muted);
    border-bottom: 2px solid var(--text-muted);
    transform: rotate(45deg);
}

@keyframes pulse-hint {
    0%, 100% { opacity: 0.4; transform: translateX(-50%) translateY(0); }
    50% { opacity: 0.9; transform: translateX(-50%) translateY(8px); }
}

/* --- Stats Row --- */
.stats-row {
    display: flex;
    gap: 80px;
    justify-content: center;
    margin-top: 20px;
}

.stat {
    text-align: center;
}

.stat-number {
    font-variant-numeric: tabular-nums;
    font-size: clamp(4.8rem, 9.6vw, 8.4rem);
    font-weight: 900;
    color: var(--magenta);
    line-height: 1;
    margin-bottom: 12px;
    letter-spacing: -0.03em;
}

.stat-label {
    font-size: 1.8rem;
    color: var(--text-muted);
    line-height: 1.4;
    max-width: 260px;
}

/* --- Feature / Info Cards --- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.card-grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 40px;
}

.info-card {
    background: var(--bg-card);
    border: 1px solid rgba(226, 0, 116, 0.12);
    border-radius: 16px;
    padding: 28px 24px;
    transition: all 0.3s ease;
}

.info-card:hover {
    border-color: rgba(226, 0, 116, 0.3);
    box-shadow: 0 8px 32px rgba(226, 0, 116, 0.08);
}

.info-card-icon {
    font-size: 2.2rem;
    margin-bottom: 14px;
}

.info-card h3 {
    font-size: 1.55rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.info-card p {
    font-size: 1.55rem;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.55;
}

/* --- Principle Cards --- */
.principle-card {
    background: rgba(226, 0, 116, 0.04);
    border: 1px solid rgba(226, 0, 116, 0.15);
    border-radius: 20px;
    padding: 36px 32px;
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

.principle-number {
    font-size: 3.6rem;
    font-weight: 900;
    color: var(--magenta);
    line-height: 1;
    flex-shrink: 0;
    opacity: 0.5;
}

.principle-card h3 {
    font-size: 1.9rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.principle-card p {
    font-size: 1.7rem;
    color: var(--text-muted);
    margin: 0;
}

/* --- Takeaway Cards --- */
.takeaway-card {
    background: var(--bg-card);
    border: 1px solid rgba(226, 0, 116, 0.15);
    border-radius: 20px;
    padding: 40px 44px;
    display: flex;
    gap: 32px;
    align-items: center;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.takeaway-card:hover {
    border-color: rgba(226, 0, 116, 0.35);
    box-shadow: 0 12px 40px rgba(226, 0, 116, 0.08);
}

.takeaway-num {
    font-size: 4.8rem;
    font-weight: 900;
    line-height: 1;
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--magenta), var(--magenta-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.takeaway-card p {
    font-size: 2.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.4;
}

/* --- Code Block --- */
.code-block {
    background: #080810;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 24px 28px;
    font-family: var(--mono);
    font-size: 1.3rem;
    color: #c8c8e0;
    line-height: 1.7;
    overflow-x: auto;
    position: relative;
    margin-top: 24px;
    text-align: left;
}

.code-block .code-comment { color: #666688; }
.code-block .code-key { color: #88aaff; }
.code-block .code-string { color: #98c47a; }
.code-block .code-hidden { color: var(--red); background: rgba(255, 68, 102, 0.1); border-radius: 3px; padding: 1px 3px; }
.code-block .code-annotation { color: var(--magenta); font-weight: 600; }

.code-label {
    display: inline-block;
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 8px;
    padding: 4px 10px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 6px;
    font-family: var(--mono);
}

/* --- Callout Boxes --- */
.callout {
    padding: 18px 24px;
    border-radius: 12px;
    margin: 24px 0 0;
    font-size: 1.2rem;
    line-height: 1.6;
}

.callout-warning {
    background: rgba(255, 68, 102, 0.07);
    border: 1px solid rgba(255, 68, 102, 0.2);
    border-left: 3px solid var(--red);
    color: var(--text-secondary);
}

.callout-warning strong { color: var(--red); }

.callout-info {
    background: rgba(226, 0, 116, 0.06);
    border: 1px solid rgba(226, 0, 116, 0.18);
    border-left: 3px solid var(--magenta);
    color: var(--text-secondary);
}

.callout-info strong { color: var(--magenta); }

.callout-success {
    background: rgba(0, 168, 160, 0.06);
    border: 1px solid rgba(0, 168, 160, 0.18);
    border-left: 3px solid var(--green);
    color: var(--text-secondary);
}

.callout-success strong { color: var(--green); }

/* --- Checklist --- */
.checklist-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 40px;
}

.checklist-col h3 {
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--magenta);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(226, 0, 116, 0.2);
}

.checklist-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 16px;
    font-size: 1.6rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.check-icon {
    color: var(--green);
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 1px;
}

/* --- Sequence Diagram --- */
.seq-diagram {
    width: 100%;
    max-width: 960px;
    margin: 32px auto 0;
    display: block;
}

/* --- Architecture Diagram --- */
.arch-diagram {
    width: 100%;
    max-width: 900px;
    margin: 32px auto 0;
    display: block;
}

/* --- Demo Placeholder --- */
.demo-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 28px;
    padding: 60px 80px;
    border: 2px dashed rgba(226, 0, 116, 0.4);
    border-radius: 24px;
    background: rgba(226, 0, 116, 0.03);
    text-align: center;
    animation: pulse-demo 2.5s ease-in-out infinite;
    max-width: 800px;
    margin: 0 auto;
}

@keyframes pulse-demo {
    0%, 100% { border-color: rgba(226, 0, 116, 0.3); }
    50% { border-color: rgba(226, 0, 116, 0.7); box-shadow: 0 0 40px rgba(226, 0, 116, 0.1); }
}

.demo-icon {
    font-size: 5rem;
    line-height: 1;
}

.demo-placeholder h2 {
    color: var(--magenta);
    margin: 0;
}

.demo-instruction {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 20px 32px;
    font-family: var(--mono);
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.8;
    text-align: left;
}

.demo-instruction .demo-arrow { color: var(--magenta); font-weight: 700; }

/* --- Context Window Diagram --- */
.context-diagram {
    width: 100%;
    max-width: 850px;
    margin: 0 auto;
}

.ctx-box {
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    overflow: hidden;
    background: #080810;
    font-family: var(--mono);
    font-size: 0.85rem;
}

.ctx-header {
    background: rgba(255, 255, 255, 0.06);
    padding: 10px 18px;
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-muted);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.ctx-row {
    padding: 14px 18px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    line-height: 1.55;
    font-size: 1.55rem;
}

.ctx-row-mcp {
    background: rgba(226, 0, 116, 0.06);
    border-bottom: 1px solid rgba(226, 0, 116, 0.12) !important;
}

.ctx-row-mcp-result {
    background: rgba(255, 68, 102, 0.06);
}

.ctx-tag {
    display: inline-block;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 2px 7px;
    border-radius: 4px;
    margin-right: 8px;
}

.ctx-tag-system { background: rgba(0, 153, 216, 0.2); color: var(--blue); }
.ctx-tag-mcp { background: rgba(226, 0, 116, 0.2); color: var(--magenta); }
.ctx-tag-call { background: rgba(232, 109, 15, 0.2); color: var(--orange); }
.ctx-tag-assistant { background: rgba(0, 168, 160, 0.2); color: var(--green); }
.ctx-tag-result { background: rgba(255, 68, 102, 0.2); color: var(--red); }
.ctx-tag-user { background: rgba(255, 255, 255, 0.1); color: var(--text-muted); }

/* --- Two-column feature split --- */
.feature-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 40px;
}

.feature-col h3 {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid;
}

.feature-col-added h3 { color: var(--green); border-color: rgba(0, 168, 160, 0.25); }
.feature-col-missing h3 { color: var(--orange); border-color: rgba(232, 109, 15, 0.25); }

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 20px;
    font-size: 1.55rem;
    color: var(--text-secondary);
    line-height: 1.45;
}

.feature-item-icon {
    flex-shrink: 0;
    font-size: 1.3rem;
    margin-top: 1px;
}

.fi-added { color: var(--green); }
.fi-missing { color: var(--orange); }

.feature-item strong { color: var(--text-primary); }

/* --- Spec Cards (large) --- */
.spec-card {
    background: var(--bg-card);
    border: 1px solid rgba(0, 168, 160, 0.2);
    border-radius: 16px;
    padding: 22px 28px;
    margin-bottom: 16px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.spec-card-icon {
    font-size: 2.1rem;
    flex-shrink: 0;
}

.spec-card h3 {
    color: var(--green);
    font-size: 1.45rem;
    margin-bottom: 6px;
}

.spec-card p {
    font-size: 1.35rem;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.5;
}

/* Missing variant (orange accent) for the gaps slide */
.spec-card-missing {
    border-color: rgba(232, 109, 15, 0.22);
    padding: 18px 28px;
    margin-bottom: 14px;
}

.spec-card-missing h3 { color: var(--orange); font-size: 1.6rem; margin-bottom: 6px; }
.spec-card-missing p  { font-size: 1.4rem; line-height: 1.45; }
.spec-card-missing .spec-card-icon { font-size: 2.2rem; }

/* --- Timeline --- */
.timeline {
    position: relative;
    max-width: 100%;
    margin: 40px auto 0;
}

.timeline-line {
    position: absolute;
    top: 38px;
    left: 0;
    right: 0;
    height: 3px;
    background: rgba(226, 0, 116, 0.2);
}

.timeline-progress {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: var(--magenta);
    width: 0%;
    transition: width 1.5s ease;
}

.timeline-items {
    display: flex;
    justify-content: space-between;
    position: relative;
}

.timeline-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    flex: 1;
}

.timeline-dot {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--bg-dark);
    border: 3px solid rgba(226, 0, 116, 0.4);
    position: relative;
    z-index: 1;
    transition: all 0.4s ease;
    flex-shrink: 0;
}

.timeline-item.active .timeline-dot {
    background: var(--magenta);
    border-color: var(--magenta);
    box-shadow: 0 0 16px var(--magenta-glow);
}

.timeline-item.highlight .timeline-dot {
    background: var(--red);
    border-color: var(--red);
    box-shadow: 0 0 16px rgba(255, 68, 102, 0.4);
    transform: scale(1.4);
}

.timeline-date {
    font-size: 1.7rem;
    font-weight: 700;
    color: var(--magenta);
    letter-spacing: 1px;
    margin-top: 0;
}

.timeline-text {
    font-size: 1.5rem;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.4;
    max-width: 220px;
}

.timeline-annotation {
    margin-top: 40px;
    text-align: center;
}

/* --- Back Button --- */
.back-to-index {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 500;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(15, 15, 25, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.back-to-index:hover {
    border-color: rgba(226, 0, 116, 0.45);
    background: rgba(226, 0, 116, 0.1);
    color: var(--magenta);
}

/* --- Language Toggle --- */
.lang-toggle {
    position: fixed;
    top: 20px;
    right: 76px;
    z-index: 500;
    display: flex;
    align-items: center;
    border-radius: 22px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(15, 15, 25, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    overflow: hidden;
    cursor: pointer;
    padding: 0;
}

.lang-seg {
    padding: 8px 14px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-muted);
    transition: color 0.2s, background 0.2s;
    border: none;
    background: none;
    cursor: pointer;
    font-family: var(--font);
}

html[data-lang="en"] .lang-seg[data-lang="en"],
html[data-lang="de"] .lang-seg[data-lang="de"] {
    color: white;
    background: var(--magenta);
}

.lang-seg:hover {
    color: var(--text-primary);
}

/* --- Theme Toggle --- */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 500;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(15, 15, 25, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    line-height: 1;
    transition: all 0.3s ease;
    color: var(--text-secondary);
    padding: 0;
}

.theme-toggle:hover {
    border-color: rgba(226, 0, 116, 0.45);
    background: rgba(226, 0, 116, 0.1);
    transform: scale(1.08);
}

/* --- Scroll to Top --- */
.scroll-to-top {
    position: fixed;
    bottom: 28px;
    right: 68px;
    z-index: 500;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(15, 15, 25, 0.75);
    backdrop-filter: blur(12px);
    cursor: pointer;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.35s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll-to-top.visible {
    opacity: 1;
    transform: translateY(0);
}

.scroll-to-top:hover {
    border-color: rgba(226, 0, 116, 0.4);
    background: rgba(226, 0, 116, 0.1);
}

.scroll-to-top::before {
    content: '';
    width: 10px;
    height: 10px;
    border-top: 2px solid var(--text-secondary);
    border-right: 2px solid var(--text-secondary);
    transform: rotate(-45deg) translateY(2px);
    display: block;
}

/* --- QR Code --- */
.qr-container {
    width: 240px;
    height: 240px;
    background: white;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 28px;
    overflow: hidden;
    box-shadow: 0 0 60px rgba(226, 0, 116, 0.15);
}

.qr-container img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.qr-placeholder {
    font-size: 0.75rem;
    color: #888;
    text-align: center;
    padding: 20px;
    font-family: var(--mono);
}

/* --- Thank You Slide --- */
.thankyou-content {
    text-align: center;
    max-width: 1000px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.thankyou-content h2 {
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 900;
    margin-bottom: 8px;
}

/* --- IDE Logos Row --- */
.ide-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin: 32px 0;
    flex-wrap: wrap;
}

.ide-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    font-size: 1.3rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.ide-chip-icon {
    font-size: 1.2rem;
}

.ide-connector {
    color: var(--text-muted);
    font-size: 1.4rem;
    font-weight: 300;
}

/* --- Animation Base States --- */
.anim-fade-up {
    opacity: 0;
    transform: translateY(40px);
}

.anim-slide-left {
    opacity: 0;
    transform: translateX(-60px);
}

.anim-slide-right {
    opacity: 0;
    transform: translateX(60px);
}

/* --- Language Display --- */
html[data-lang="de"] .lang-en { display: none; }
html[data-lang="en"] .lang-de { display: none; }

/* --- Light Mode --- */
html[data-theme="light"] {
    --bg-dark: #f4f4fa;
    --bg-section: #ededf4;
    --bg-card: #ffffff;
    --bg-card-hover: #f0f0f8;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #55556e;
    --green-glow: rgba(0, 168, 160, 0.2);
    --blue-glow: rgba(0, 153, 216, 0.2);
    --magenta-glow: rgba(226, 0, 116, 0.2);
}

html[data-theme="light"] .theme-toggle {
    background: rgba(244, 244, 250, 0.9);
    border-color: rgba(0, 0, 0, 0.12);
}

html[data-theme="light"] .lang-toggle {
    background: rgba(244, 244, 250, 0.9);
    border-color: rgba(0, 0, 0, 0.12);
}

html[data-theme="light"] .back-to-index {
    background: rgba(244, 244, 250, 0.9);
    border-color: rgba(0, 0, 0, 0.12);
    color: var(--text-muted);
}

html[data-theme="light"] .scroll-to-top {
    background: rgba(244, 244, 250, 0.9);
    border-color: rgba(0, 0, 0, 0.12);
}

html[data-theme="light"] .grid-bg {
    background-image:
        linear-gradient(rgba(226, 0, 116, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(226, 0, 116, 0.05) 1px, transparent 1px);
}

html[data-theme="light"] .code-block {
    background: #f0f0f8;
    border-color: rgba(0, 0, 0, 0.1);
    color: #1a1a3e;
}

html[data-theme="light"] .progress-dot {
    background: rgba(0, 0, 0, 0.2);
}

html[data-theme="light"] .scroll-arrow {
    border-color: rgba(0, 0, 0, 0.3);
}

html[data-theme="light"] .demo-instruction {
    background: rgba(0, 0, 0, 0.05);
}

html[data-theme="light"] .ctx-box {
    background: #f0f0f8;
}

html[data-theme="light"] .ctx-row { color: var(--text-secondary); }
html[data-theme="light"] .ctx-header { color: var(--text-muted); background: rgba(0,0,0,0.05); }

html[data-theme="light"] .spec-card {
    background: rgba(0, 168, 160, 0.04);
}

/* --- SVG light mode: override hardcoded dark-only fills to ensure contrast --- */
html[data-theme="light"] svg text,
html[data-theme="light"] svg tspan {
    fill: var(--text-primary);
}
/* Preserve branded accent colors that stay readable on light backgrounds */
html[data-theme="light"] svg text[fill="#E20074"],
html[data-theme="light"] svg tspan[fill="#E20074"] { fill: #E20074; }
html[data-theme="light"] svg text[fill="#00A8A0"],
html[data-theme="light"] svg tspan[fill="#00A8A0"] { fill: #007a75; }
html[data-theme="light"] svg text[fill="#ff4466"],
html[data-theme="light"] svg tspan[fill="#ff4466"] { fill: #c8002e; }
html[data-theme="light"] svg text[fill="#0099D8"],
html[data-theme="light"] svg tspan[fill="#0099D8"] { fill: #0077a8; }
html[data-theme="light"] svg text[fill="#88aaff"],
html[data-theme="light"] svg tspan[fill="#88aaff"] { fill: #2244cc; }

/* Code boxes inside sequence diagrams */
html[data-theme="light"] svg rect[fill="rgba(10,10,20,0.7)"],
html[data-theme="light"] svg rect[fill="rgba(10,10,20,0.6)"] {
    fill: rgba(220, 220, 235, 0.9);
    stroke: rgba(0,0,0,0.15);
}
html[data-theme="light"] svg text[fill="#c8c8e0"],
html[data-theme="light"] svg tspan[fill="#c8c8e0"] { fill: #1a1a3e; }
html[data-theme="light"] svg text[fill="#98c47a"],
html[data-theme="light"] svg tspan[fill="#98c47a"] { fill: #2a6e2a; }
html[data-theme="light"] svg text[fill="#8888a2"],
html[data-theme="light"] svg tspan[fill="#8888a2"] { fill: #55556e; }

/* --- Responsive --- */
@media (max-width: 1024px) {
    .section { padding: 60px 30px; }
    .content-split { grid-template-columns: 1fr; gap: 40px; }
    .card-grid { grid-template-columns: 1fr; }
    .card-grid-2 { grid-template-columns: 1fr; }
    .checklist-grid { grid-template-columns: 1fr; }
    .feature-split { grid-template-columns: 1fr; }
    .stats-row { gap: 40px; }
    .progress-nav { right: 12px; }
    .progress-label { display: none; }
}

@media (max-width: 768px) {
    .section { padding: 40px 20px; }
    h1 { font-size: 2.6rem; }
    h2 { font-size: 2.4rem; }
    .stat-number { font-size: 3.5rem; }
    .lang-toggle { right: 72px; }
    .takeaway-card { padding: 24px 20px; flex-direction: column; gap: 12px; }
    .takeaway-num { font-size: 2.5rem; }
}