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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
    transition: background-color 0.3s ease, color 0.3s ease;
}

body.dark-mode {
    background-color: #121212;
    color: #e0e0e0;
}

header {
    background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
    color: white;
    padding: 60px 20px;
    text-align: center;
}

header h1 {
    font-size: 2.4em;
    margin-bottom: 10px;
}

header p {
    font-size: 1.2em;
    opacity: 0.9;
    margin-bottom: 25px;
}

.header-links {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.header-btn {
    display: inline-block;
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.header-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.header-btn i {
    margin-right: 8px;
}

nav {
    background-color: #333;
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.nav-toggle {
    display: none;
}

nav a {
    display: block;
    color: white;
    text-decoration: none;
    padding: 15px 25px;
    transition: background-color 0.3s;
    font-weight: 600;
}

nav a:hover {
    background-color: #d97706;
}

.dark-mode-btn {
    background: none;
    border: none;
    color: white;
    font-size: 1em;
    cursor: pointer;
    padding: 15px 25px;
    transition: background-color 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    line-height: 1.6;
}

.dark-mode-btn:hover {
    background-color: #d97706;
}

.mode-label {
    font-size: 0.95em;
    font-weight: 500;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

section {
    background: white;
    margin-bottom: 40px;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

body.dark-mode section {
    background: #1e1e1e;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

section h2 {
    color: #d97706;
    font-size: 2em;
    margin-bottom: 30px;
    border-bottom: 3px solid #d97706;
    padding-bottom: 10px;
}

section h2 i {
    margin-right: 10px;
}

section h3 {
    color: #333;
    font-size: 1.5em;
    margin: 25px 0 15px 0;
}

body.dark-mode section h3 {
    color: #e0e0e0;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.feature-card {
    background-color: #f9f9f9;
    border: 2px solid #e0e0e0;
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s ease;
}

body.dark-mode .feature-card {
    background-color: #2a2a2a;
    border-color: #3a3a3a;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(217, 119, 6, 0.35);
}

.feature-card i {
    font-size: 2.5em;
    color: #d97706;
    margin-bottom: 15px;
}

.feature-card h3 {
    font-size: 1.2em;
    margin: 10px 0;
}

.feature-card p {
    font-size: 0.95em;
    color: #666;
}

body.dark-mode .feature-card p {
    color: #b0b0b0;
}

/* Specs Box */
.specs-box, .metrics-box, .resources-box {
    background-color: #f7f7fb;
    border-left: 4px solid #d97706;
    padding: 25px;
    border-radius: 6px;
    margin: 25px 0;
}

body.dark-mode .specs-box,
body.dark-mode .metrics-box,
body.dark-mode .resources-box {
    background-color: #1c1c24;
    border-color: #f2c27b;
}

.specs-box ul, .metrics-box ul, .resources-box ul {
    list-style: none;
    padding-left: 0;
}

.specs-box ul li, .metrics-box ul li {
    padding: 8px 0;
    border-bottom: 1px solid #e0e0e0;
}

body.dark-mode .specs-box ul li,
body.dark-mode .metrics-box ul li {
    border-bottom-color: #3a3a3a;
}

.specs-box ul li:last-child,
.metrics-box ul li:last-child {
    border-bottom: none;
}

.resources-box ul li {
    padding: 10px 0;
}

.resources-box a {
    color: #d97706;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.resources-box a:hover {
    color: #b45309;
    text-decoration: underline;
}

.resources-box i {
    margin-right: 8px;
}

/* Design Architecture */
.stage-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 25px 0;
}

.stage-card {
    background: linear-gradient(135deg, #d9770615 0%, #b4530915 100%);
    border: 2px solid #d9770640;
    padding: 20px;
    border-radius: 8px;
    position: relative;
}

body.dark-mode .stage-card {
    background: linear-gradient(135deg, #d9770625 0%, #b4530925 100%);
    border-color: #d9770660;
}

.stage-number {
    position: absolute;
    top: -15px;
    left: 20px;
    background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    font-weight: bold;
}

.stage-card h4 {
    margin: 15px 0 10px 0;
    color: #d97706;
    font-size: 1.1em;
}

body.dark-mode .stage-card h4 {
    color: #f2c27b;
}

/* Schematic Container */
.schematic-container {
    margin: 30px 0;
    text-align: center;
}

.schematic-img {
    width: 100%;
    max-width: 900px;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    margin: 20px 0;
}

body.dark-mode .schematic-img {
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.image-caption {
    font-style: italic;
    color: #666;
    font-size: 0.95em;
    margin-top: 10px;
}

body.dark-mode .image-caption {
    color: #a0a0a0;
}

/* Design Highlights */
.design-highlights ul {
    list-style: none;
    padding-left: 0;
}

.design-highlights ul li {
    padding: 12px 0;
    padding-left: 30px;
    position: relative;
    border-bottom: 1px solid #e0e0e0;
}

body.dark-mode .design-highlights ul li {
    border-bottom-color: #3a3a3a;
}

.design-highlights ul li:last-child {
    border-bottom: none;
}

.design-highlights ul li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: #d97706;
    font-weight: bold;
}

/* Findings Grid */
.findings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 25px 0;
}

.finding-card {
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid;
}

.finding-card.challenge {
    background-color: #fff3cd;
    border-color: #ffc107;
}

body.dark-mode .finding-card.challenge {
    background-color: #2a2817;
    border-color: #ffa500;
}

.finding-card.solution {
    background-color: #d1ecf1;
    border-color: #17a2b8;
}

body.dark-mode .finding-card.solution {
    background-color: #1a2528;
    border-color: #20c997;
}

.finding-card.tradeoff {
    background-color: #e7e7ff;
    border-color: #d97706;
}

body.dark-mode .finding-card.tradeoff {
    background-color: #1e1e2e;
    border-color: #f2c27b;
}

.finding-card h4 {
    margin-bottom: 10px;
    font-size: 1.1em;
}

.finding-card h4 i {
    margin-right: 8px;
}

/* Comparison Section */
.comparison-grid {
    display: flex;
    flex-direction: column;
    gap: 40px;
    margin: 30px 0;
}

.comparison-pair {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
}

.comparison-item {
    background-color: #f9f9f9;
    padding: 20px;
    border-radius: 8px;
}

body.dark-mode .comparison-item {
    background-color: #2a2a2a;
}

.comparison-item h4 {
    text-align: center;
    color: #d97706;
    margin-bottom: 15px;
    font-size: 1.2em;
}

body.dark-mode .comparison-item h4 {
    color: #f2c27b;
}

.comparison-item img {
    width: 100%;
    height: auto;
    border-radius: 6px;
    margin-bottom: 10px;
}

/* Audio Grid */
.audio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 30px 0;
}

.audio-card {
    background-color: #f9f9f9;
    border: 2px solid #e0e0e0;
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    display: flex;
    flex-direction: column;
    min-height: 450px;
}

body.dark-mode .audio-card {
    background-color: #2a2a2a;
    border-color: #3a3a3a;
}

.audio-icon {
    font-size: 3em;
    color: #d97706;
    margin-bottom: 15px;
}

.audio-card h3 {
    font-size: 1.3em;
    margin: 10px 0;
}

.audio-card p {
    color: #666;
    margin-bottom: 20px;
    font-size: 0.95em;
}

body.dark-mode .audio-card p {
    color: #b0b0b0;
}

.audio-card audio {
    width: 100%;
    margin: 20px 0;
}

.download-links {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 15px;
}

.download-links a {
    color: #d97706;
    text-decoration: none;
    font-size: 0.9em;
    font-weight: 500;
    transition: color 0.3s;
}

.download-links a:hover {
    color: #b45309;
    text-decoration: underline;
}

.download-links i {
    margin-right: 5px;
}

/* Build Gallery */
.build-gallery {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin: 30px 0;
    align-items: center;
}

.build-item {
    text-align: center;
    max-width: 600px;
}

.build-item.large {
    max-width: 800px;
}

.build-item img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    margin-bottom: 15px;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.build-item img:hover {
    transform: scale(1.02);
    box-shadow: 0 6px 15px rgba(0,0,0,0.2);
}

body.dark-mode .build-item img {
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

body.dark-mode .build-item img:hover {
    box-shadow: 0 6px 15px rgba(0,0,0,0.5);
}

/* Image Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.9);
    overflow: auto;
}

.modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 90%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 8px;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.modal-close:hover,
.modal-close:focus {
    color: #bbb;
}

/* Improvements Grid */
.improvements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.improvement-card {
    background-color: #f9f9f9;
    border: 2px solid #e0e0e0;
    padding: 25px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

body.dark-mode .improvement-card {
    background-color: #2a2a2a;
    border-color: #3a3a3a;
}

.improvement-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(217, 119, 6, 0.35);
}

.improvement-icon {
    font-size: 2.5em;
    color: #d97706;
    margin-bottom: 15px;
}

.improvement-card h3 {
    margin: 10px 0;
    font-size: 1.2em;
}

.improvement-card ul {
    list-style: none;
    padding-left: 0;
}

.improvement-card ul li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
    color: #666;
    font-size: 0.95em;
}

body.dark-mode .improvement-card ul li {
    color: #b0b0b0;
}

.improvement-card ul li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: #d97706;
    font-weight: bold;
}

/* Contributors Box */
.contributors-box, .acknowledgments-box, .license-box {
    background-color: #f7f7fb;
    border-left: 4px solid #d97706;
    padding: 25px;
    border-radius: 6px;
    margin: 25px 0;
}

body.dark-mode .contributors-box,
body.dark-mode .acknowledgments-box,
body.dark-mode .license-box {
    background-color: #1c1c24;
    border-color: #f2c27b;
}

.contributors-box h3, .acknowledgments-box h3, .license-box h3 {
    color: #d97706;
    margin-bottom: 15px;
    font-size: 1.2em;
}

body.dark-mode .contributors-box h3,
body.dark-mode .acknowledgments-box h3,
body.dark-mode .license-box h3 {
    color: #f2c27b;
}

.contributors-box ul, .acknowledgments-box ul {
    list-style: none;
    padding-left: 0;
}

.contributors-box ul li, .acknowledgments-box ul li {
    padding: 10px 0;
    padding-left: 25px;
    position: relative;
    border-bottom: 1px solid #e0e0e0;
}

body.dark-mode .contributors-box ul li,
body.dark-mode .acknowledgments-box ul li {
    border-bottom-color: #3a3a3a;
}

.contributors-box ul li:last-child,
.acknowledgments-box ul li:last-child {
    border-bottom: none;
}

.contributors-box ul li:before,
.acknowledgments-box ul li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: #d97706;
    font-weight: bold;
}

.license-box p {
    margin: 10px 0;
}

.license-box a {
    color: #d97706;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.license-box a:hover {
    color: #b45309;
    text-decoration: underline;
}

.license-box i {
    margin-right: 8px;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
}

footer a {
    color: #d97706;
    text-decoration: none;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }

    header p {
        font-size: 1em;
    }

    nav {
        display: flex !important;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
    }

    nav ul {
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background-color: #333;
        flex-direction: column;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
        width: 100%;
    }

    nav ul li {
        width: 100%;
    }

    nav ul.active {
        max-height: 500px;
    }

    .nav-toggle {
        display: flex !important;
        align-items: center;
        justify-content: center;
        background: none;
        border: none;
        color: white;
        font-size: 1.5em;
        cursor: pointer;
        padding: 15px 20px;
        margin-left: auto;
    }

    nav a {
        padding: 12px 25px;
        font-size: 0.95em;
        border-bottom: 1px solid #555;
    }

    .dark-mode-btn {
        padding: 12px 25px;
        order: 3;
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: flex-start;
        gap: 8px;
        text-align: left;
        border-bottom: 1px solid #555;
    }

    .container {
        padding: 20px 10px;
    }

    section {
        padding: 20px;
    }

    .features-grid, .stage-cards, .findings-grid, .audio-grid {
        grid-template-columns: 1fr;
    }

    .comparison-pair {
        grid-template-columns: 1fr;
    }

    .build-gallery {
        grid-template-columns: 1fr;
    }
}