@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
    --bg-main: #090d16;
    --bg-card: rgba(17, 24, 39, 0.65);
    --bg-card-hover: rgba(26, 36, 56, 0.8);
    --border-color: rgba(255, 255, 255, 0.06);
    --border-color-hover: rgba(6, 182, 212, 0.3);
    
    --primary: #06b6d4; /* Neon Cyan */
    --primary-glow: rgba(6, 182, 212, 0.15);
    --secondary: #eab308; /* Amber */
    --secondary-glow: rgba(234, 179, 8, 0.15);
    --accent: #a855f7; /* Purple */
    
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --text-dark: #64748b;
    
    --font-heading: 'Outfit', 'Noto Sans JP', sans-serif;
    --font-body: 'Noto Sans JP', sans-serif;
    
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
    scrollbar-color: var(--primary) var(--bg-main);
    scrollbar-width: thin;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

/* Background Gradients */
body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 10% 20%, rgba(6, 182, 212, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 85% 60%, rgba(168, 85, 247, 0.05) 0%, transparent 45%),
        radial-gradient(circle at 50% 15%, rgba(234, 179, 8, 0.03) 0%, transparent 35%);
    pointer-events: none;
    z-index: -1;
}

/* Layout */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
header {
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 3rem;
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(9, 13, 22, 0.8);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.05em;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.logo span {
    color: var(--primary);
    text-shadow: 0 0 10px var(--primary-glow);
}

.badge-tag {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    background: rgba(6, 182, 212, 0.1);
    color: var(--primary);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    border: 1px solid rgba(6, 182, 212, 0.2);
}

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: 5rem;
    padding: 4rem 1rem;
    position: relative;
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 5vw, 4.2rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #ffffff 30%, #a5f3fc 70%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    color: var(--text-muted);
    max-width: 800px;
    margin: 0 auto 2.5rem auto;
    font-weight: 300;
}

.hero-meta {
    display: flex;
    justify-content: center;
    gap: 2rem;
    font-family: var(--font-heading);
    color: var(--text-dark);
    font-size: 0.9rem;
}

.hero-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Main Grid Layout */
.main-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 3rem;
    margin-bottom: 6rem;
}

/* Sidebar & TOC */
.sidebar {
    position: sticky;
    top: 7rem;
    height: fit-content;
}

.toc-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    backdrop-filter: blur(12px);
}

.toc-title {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    letter-spacing: 0.05em;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toc-title::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 16px;
    background: var(--primary);
    border-radius: 2px;
}

.toc-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.toc-item a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-fast);
    display: block;
    padding-left: 0.5rem;
    border-left: 2px solid transparent;
}

.toc-item a:hover {
    color: var(--primary);
    padding-left: 0.75rem;
}

.toc-item.active a {
    color: var(--primary);
    font-weight: 500;
    border-left-color: var(--primary);
    padding-left: 0.75rem;
}

/* Content Area */
.content-area {
    min-width: 0; /* Prevents flex items from overflowing */
}

.section-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2.5rem;
    margin-bottom: 3rem;
    backdrop-filter: blur(12px);
    transition: border-color var(--transition-smooth), transform var(--transition-smooth);
}

.section-card:hover {
    border-color: var(--border-color-hover);
}

.section-title {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-main);
}

.section-title svg {
    color: var(--primary);
}

/* Equipments Grid */
.equipment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.equipment-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 20px;
    padding: 1.25rem;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.equipment-card:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(6, 182, 212, 0.25);
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(9, 13, 22, 0.5), 0 0 20px rgba(6, 182, 212, 0.05);
}

.eq-image-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 16/10;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 1.25rem;
    border: 1px solid rgba(255, 255, 255, 0.06);
    background: rgba(0, 0, 0, 0.3);
    cursor: pointer;
}

.eq-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.equipment-card:hover .eq-image-wrapper img {
    transform: scale(1.05);
}

.eq-image-wrapper .image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(9, 13, 22, 0.8), transparent 50%);
    display: flex;
    align-items: flex-end;
    padding: 0.75rem;
    opacity: 0;
    transition: var(--transition-fast);
}

.eq-image-wrapper:hover .image-overlay {
    opacity: 1;
}

.eq-content {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    padding: 0.25rem;
}

.eq-role {
    font-size: 0.75rem;
    font-family: var(--font-heading);
    text-transform: uppercase;
    color: var(--primary);
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.eq-name {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-main);
}

.eq-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* Setup Visual */
.setup-visual-container {
    margin: 2.5rem 0;
    background: rgba(255, 255, 255, 0.01);
    border: 1px dashed rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.setup-title {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.setup-svg {
    max-width: 100%;
    height: auto;
    filter: drop-shadow(0 0 20px rgba(6, 182, 212, 0.05));
}

/* Wave lines animation */
.wave-line {
    stroke-dasharray: 8;
    animation: flow 1.5s linear infinite;
}

@keyframes flow {
    to {
        stroke-dashoffset: -16;
    }
}

/* Measurement Section Grid */
.measure-container {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 2.5rem;
    margin-top: 1.5rem;
}

.measure-image-wrapper {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    aspect-ratio: 4/3;
    border: 1px solid rgba(255, 255, 255, 0.08);
    cursor: pointer;
    background: #000;
}

.measure-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: var(--transition-smooth);
}

.measure-image-wrapper:hover img {
    transform: scale(1.03);
}

.image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(9, 13, 22, 0.8), transparent 40%);
    display: flex;
    align-items: flex-end;
    padding: 1.25rem;
    opacity: 0;
    transition: var(--transition-fast);
}

.measure-image-wrapper:hover .image-overlay {
    opacity: 1;
}

.zoom-badge {
    background: var(--primary);
    color: var(--bg-main);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.8rem;
    padding: 0.35rem 0.75rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
}

/* Parameters Description Grid */
.parameters-box {
    margin-bottom: 1.5rem;
}

.param-title {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 0.25rem;
}

.param-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.param-item {
    display: flex;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.015);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border-left: 3px solid var(--primary);
}

.param-item.secondary-accent {
    border-left-color: var(--secondary);
}

.param-name {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.param-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.analysis-box {
    margin-top: 1.5rem;
}

.analysis-header {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.analysis-text {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* Highlighting specific parameters inside the analysis text */
.highlight-cyan {
    color: var(--primary);
    font-weight: 500;
}
.highlight-amber {
    color: var(--secondary);
    font-weight: 500;
}

/* Lightbox Modal */
.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(9, 13, 22, 0.95);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
}

.lightbox.active {
    opacity: 1;
    pointer-events: auto;
}

.lightbox-content {
    max-width: 90%;
    max-height: 85%;
    position: relative;
}

.lightbox-img {
    width: 100%;
    height: auto;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.lightbox-caption {
    text-align: center;
    margin-top: 1rem;
    font-family: var(--font-heading);
    color: var(--text-main);
    font-size: 1.1rem;
}

.lightbox-close {
    position: absolute;
    top: 2rem;
    right: 2rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.lightbox-close:hover {
    background: var(--primary);
    color: var(--bg-main);
    transform: scale(1.05);
}

/* Custom Scroll animations */
.fade-in-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    visibility: hidden;
}

.fade-in-section.is-visible {
    opacity: 1;
    transform: none;
    visibility: visible;
}

/* Conclusions section styling */
.conclusion-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 2.5rem;
    align-items: center;
}

.conclusion-points {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.conclusion-point {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 12px;
    padding: 1.25rem;
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.point-num {
    background: var(--primary);
    color: var(--bg-main);
    font-family: var(--font-heading);
    font-weight: 700;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.point-text h4 {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-main);
}

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

/* Footer */
footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
    margin-top: 5rem;
    text-align: center;
    color: var(--text-dark);
    font-family: var(--font-heading);
    font-size: 0.85rem;
}

/* Responsiveness */
@media (max-width: 1024px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        display: none; /* Hide floating TOC on mobile */
    }
}

@media (max-width: 768px) {
    .measure-container {
        grid-template-columns: 1fr;
    }
    
    .conclusion-grid {
        grid-template-columns: 1fr;
    }
    
    .section-card {
        padding: 1.5rem;
    }
}

/* Reference Video Card */
.reference-video-container {
    margin-top: 3rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 2.5rem;
}

.video-card {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 2rem;
    background: rgba(255, 255, 255, 0.015);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 20px;
    padding: 1.5rem;
    align-items: center;
    transition: var(--transition-smooth);
}

.video-card:hover {
    background: rgba(255, 255, 255, 0.035);
    border-color: rgba(168, 85, 247, 0.3); /* Purple glow for video */
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(9, 13, 22, 0.4), 0 0 15px rgba(168, 85, 247, 0.05);
}

.video-thumbnail-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.15), rgba(6, 182, 212, 0.15)), rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.video-thumbnail-wrapper::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle, transparent 35%, rgba(0, 0, 0, 0.6));
    z-index: 1;
}

.play-btn-circle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(168, 85, 247, 0.9);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 15px rgba(168, 85, 247, 0.4);
}

.video-card:hover .play-btn-circle {
    transform: scale(1.1);
    background: var(--accent);
    box-shadow: 0 6px 20px rgba(168, 85, 247, 0.6);
}

.video-tag {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    background: #ef4444; /* YouTube red */
    color: #ffffff;
    font-size: 0.7rem;
    font-family: var(--font-heading);
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    z-index: 2;
    letter-spacing: 0.05em;
}

.video-info {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.video-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.45;
}

.video-creator {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 600;
}

.video-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin: 0.25rem 0 0.75rem 0;
}

.video-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(168, 85, 247, 0.1);
    border: 1px solid rgba(168, 85, 247, 0.2);
    color: var(--text-main);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.55rem 1.15rem;
    border-radius: 8px;
    width: fit-content;
    text-decoration: none;
    transition: var(--transition-fast);
}

.video-btn:hover {
    background: var(--accent);
    color: var(--bg-main);
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(168, 85, 247, 0.25);
}

@media (max-width: 768px) {
    .video-card {
        grid-template-columns: 1fr;
        gap: 1.25rem;
        padding: 1.25rem;
    }
    
    .video-thumbnail-wrapper {
        max-width: 360px;
        margin: 0 auto;
    }
}