:root {
    --primary: #00e5ff; /* Cyan accent similar to IDE */
    --bg: #0d1117;
    --surface: #161b22;
    --text-pri: #e6edf3;
    --text-sec: #8b949e;
    --white: #ffffff;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg);
    color: var(--text-pri);
    line-height: 1.6;
    scroll-behavior: smooth;
}

header {
    padding: 20px 5%;
    position: fixed;
    width: 100%;
    background: rgba(13, 17, 23, 0.95);
    z-index: 1000;
    border-bottom: 1px solid #30363d;
}

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

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text-pri);
    text-decoration: none;
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: 1px;
}

.logo img {
    width: 44px;
    height: 44px;
    object-fit: contain;
    border-radius: 10px;
}

.logo span {
    color: var(--text-pri);
}

nav ul {
    display: flex;
    list-style: none;
    align-items: center;
}

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-pri);
    font-weight: 500;
    transition: 0.3s;
}

nav ul li a:hover {
    color: var(--primary);
}

.btn-primary {
    background: var(--primary);
    color: #000 !important;
    padding: 8px 20px;
    border-radius: 5px;
    font-weight: bold;
}

/* Hero Section */
.hero {
    padding: 150px 5% 100px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    min-height: 90vh;
}

.hero-content {
    flex: 1;
    padding-right: 50px;
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-content h1 span {
    color: var(--primary);
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-sec);
    margin-bottom: 30px;
}

.hero-btns {
    display: flex;
    gap: 20px;
}

.btn-download {
    background: var(--primary);
    color: #000;
    text-decoration: none;
    padding: 15px 30px;
    border-radius: 50px;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: 0.3s;
}

.btn-secondary {
    border: 2px solid var(--primary);
    color: var(--primary);
    text-decoration: none;
    padding: 15px 30px;
    border-radius: 50px;
    font-weight: bold;
    transition: 0.3s;
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-download:hover, .btn-secondary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 229, 255, 0.2);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

.phone-mockup {
    width: 280px;
    height: 580px;
    background: #21262d;
    border: 12px solid #30363d;
    border-radius: 40px;
    position: relative;
    box-shadow: 0 30px 60px rgba(0,0,0,0.5);
}

.screen-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--primary);
}

.preview-logo {
    width: 120px;
    height: 120px;
    object-fit: contain;
    margin-bottom: 18px;
    border-radius: 24px;
    box-shadow: 0 18px 42px rgba(0,0,0,0.35);
}

/* Features */
.features {
    padding: 100px 5%;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.features h2 {
    font-size: 2.5rem;
    margin-bottom: 50px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--surface);
    padding: 40px;
    border-radius: 20px;
    border: 1px solid #30363d;
    transition: 0.3s;
}

.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
}

.feature-card p {
    color: var(--text-sec);
}

/* Open Source */
.opensource-section {
    padding: 90px 5%;
    background: var(--surface);
    border-top: 1px solid #30363d;
    border-bottom: 1px solid #30363d;
}

.opensource-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
    gap: 40px;
    align-items: center;
}

.eyebrow {
    display: inline-block;
    color: var(--primary);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 14px;
}

.opensource-copy h2 {
    font-size: 2.4rem;
    line-height: 1.2;
    margin-bottom: 20px;
}

.opensource-copy p {
    color: var(--text-sec);
    font-size: 1.15rem;
    max-width: 720px;
}

.contribution-card {
    background: var(--bg);
    border: 1px solid #30363d;
    border-radius: 20px;
    padding: 36px;
}

.contribution-card i {
    color: var(--primary);
    font-size: 3rem;
    margin-bottom: 20px;
}

.contribution-card h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.contribution-card p {
    color: var(--text-sec);
    margin-bottom: 24px;
}

.btn-github {
    display: inline-block;
    color: #000;
    background: var(--primary);
    text-decoration: none;
    font-weight: 800;
    padding: 12px 18px;
    border-radius: 50px;
    transition: 0.3s;
    max-width: 100%;
    overflow-wrap: anywhere;
}

.btn-github:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 229, 255, 0.2);
}

/* About Page */
.about-page {
    padding-top: 120px;
}

.about-hero {
    max-width: 1000px;
    margin: 0 auto;
    padding: 80px 5% 70px;
}

.about-hero h1 {
    font-size: 3.3rem;
    line-height: 1.15;
    max-width: 920px;
    margin-bottom: 22px;
}

.about-hero p {
    color: var(--text-sec);
    font-size: 1.25rem;
    max-width: 760px;
    margin-bottom: 30px;
}

.about-story,
.termux-section,
.about-contribute {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 5%;
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
    gap: 40px;
    align-items: center;
}

.about-story h2,
.about-grid-section h2,
.termux-section h2,
.roadmap-section h2,
.about-contribute h2 {
    font-size: 2.3rem;
    line-height: 1.2;
    margin-bottom: 18px;
}

.about-story p,
.termux-section p,
.about-contribute p {
    color: var(--text-sec);
    font-size: 1.1rem;
    margin-bottom: 16px;
}

.about-highlight,
.about-feature {
    background: var(--surface);
    border: 1px solid #30363d;
    border-radius: 20px;
    padding: 34px;
}

.about-highlight i,
.about-feature i {
    color: var(--primary);
    font-size: 2.4rem;
    margin-bottom: 18px;
}

.about-highlight h3,
.about-feature h3 {
    margin-bottom: 12px;
}

.about-highlight p,
.about-feature p {
    color: var(--text-sec);
}

.about-grid-section,
.roadmap-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 5%;
}

.about-feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.termux-section {
    background: var(--surface);
    max-width: none;
    padding-left: max(5%, calc((100% - 1200px) / 2));
    padding-right: max(5%, calc((100% - 1200px) / 2));
    border-top: 1px solid #30363d;
    border-bottom: 1px solid #30363d;
}

.termux-steps {
    background: var(--bg);
    border: 1px solid #30363d;
    border-radius: 20px;
    padding: 30px 30px 30px 54px;
    color: var(--text-sec);
}

.termux-steps li {
    margin-bottom: 12px;
}

.roadmap-list {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.roadmap-list span {
    border: 1px solid #30363d;
    border-radius: 50px;
    color: var(--text-pri);
    background: var(--surface);
    padding: 12px 18px;
    font-weight: 700;
}

.about-contribute {
    align-items: end;
}

.about-contribute .btn-github {
    justify-self: end;
}

/* Download Section */
.download-section {
    padding: 100px 5%;
    background: linear-gradient(180deg, var(--bg), #001a1c);
    text-align: center;
}

.download-container {
    max-width: 800px;
    margin: 0 auto;
}

.download-container h2 {
    font-size: 2.8rem;
    margin-bottom: 20px;
}

.download-container p {
    margin-bottom: 40px;
    color: var(--text-sec);
    font-size: 1.2rem;
}

.btn-large {
    background: var(--primary);
    color: #000;
    text-decoration: none;
    padding: 20px 50px;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: 800;
    display: inline-block;
    transition: 0.3s;
}

/* Footer */
footer {
    padding: 50px 5%;
    text-align: center;
    border-top: 1px solid #30363d;
    color: var(--text-sec);
}

/* Responsive */
@media (max-width: 900px) {
    header {
        position: static;
    }
    nav {
        flex-direction: column;
        gap: 18px;
    }
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 12px 18px;
    }
    nav ul li {
        margin-left: 0;
    }
    .hero {
        flex-direction: column;
        padding-top: 60px;
        text-align: center;
    }
    .hero-content {
        padding-right: 0;
        margin-bottom: 50px;
    }
    .hero-btns {
        justify-content: center;
        flex-wrap: wrap;
    }
    .hero-content h1 {
        font-size: 2.5rem;
    }
    .opensource-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .opensource-copy p {
        margin: 0 auto;
    }
    .about-page {
        padding-top: 0;
    }
    .about-hero {
        padding-top: 60px;
        text-align: center;
    }
    .about-hero h1 {
        font-size: 2.4rem;
    }
    .about-story,
    .termux-section,
    .about-contribute {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .about-contribute .btn-github {
        justify-self: center;
    }
    .roadmap-list {
        justify-content: center;
    }
}