/* =========================================
   1. CORE VARIABLES & RESET
   ========================================= */
:root {
    --bg-base: #0A0A0A;
    --bg-surface: #111111;
    --text-main: #E0E0E0;
    --text-muted: #888888;
    --cyan-glow: #00F3FF;
    --violet-glow: #BD00FF;
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-main);
    font-family: var(--font-sans);
    overflow-x: hidden;
    background-image: linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 40px 40px;
    background-attachment: fixed;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 5%;
}

/* =========================================
   2. GLOBAL ANIMATIONS
   ========================================= */
.fade-in {
    opacity: 0;
    animation: fadeIn 1s ease-in forwards;
}

.delay-1 {
    animation-delay: 0.5s;
}

.delay-2 {
    animation-delay: 1s;
}

.delay-3 {
    animation-delay: 1.5s;
}

.delay-4 {
    animation-delay: 2s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.cursor, .cursor-nav {
    display: inline-block;
    width: 8px;
    background-color: var(--cyan-glow);
    vertical-align: middle;
    animation: blink 1s step-end infinite;
}

.cursor {
    height: 1rem;
}

.cursor-nav {
    height: 1.2rem;
    margin-left: 2px;
}

@keyframes blink {
    0%, 100% {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }
}

/* =========================================
   3. DESKTOP NAVIGATION & LOGO
   ========================================= */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 5%;
    font-family: var(--font-mono);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-logo-container {
    display: flex;
    align-items: center;
    gap: 15px;
    opacity: 0;
    animation: fadeIn 1s ease-in forwards;
}

.nav-logo-icon {
    width: 48px; /* Increased from 35px */
    height: 48px; /* Increased from 35px */
    background-image: url('../billennium_logo.png');
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    -webkit-mask-image: url('../billennium_logo.png');
    mask-image: url('../billennium_logo.png');
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-position: center;
    mask-position: center;
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    background: linear-gradient(135deg, var(--cyan-glow), var(--violet-glow));
    transition: all 0.3s ease;
}

.nav-logo-container:hover .nav-logo-icon {
    box-shadow: 0 0 15px rgba(189, 0, 255, 0.4);
    transform: scale(1.05);
}

.logo {
    color: var(--text-main);
    text-decoration: none;
    font-size: 1.2rem;
    letter-spacing: 1px;
}

    .logo span {
        color: var(--cyan-glow);
    }

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
    margin-left: auto;
}

    .nav-links a {
        color: var(--text-muted);
        text-decoration: none;
        font-size: 0.9rem;
        transition: color 0.3s ease;
    }

        .nav-links a:hover, .nav-links a.active {
            color: var(--cyan-glow);
        }

/* =========================================
   4. TYPOGRAPHY & BUTTONS
   ========================================= */
.hero {
    padding: 6rem 0;
    position: relative;
}

.terminal-status {
    font-family: var(--font-mono);
    color: var(--cyan-glow);
    font-size: 0.9rem;
    letter-spacing: 2px;
    margin-bottom: 2rem;
}

.main-heading {
    font-size: 4rem;
    font-weight: 300;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

    .main-heading strong {
        font-weight: 600;
        background: linear-gradient(90deg, #ffffff, var(--text-muted));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
    }

.sub-heading {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 700px;
    margin-bottom: 3rem;
}

.section-title {
    font-family: var(--font-mono);
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 1rem;
    letter-spacing: 2px;
}

.term-link {
    display: inline-block;
    font-family: var(--font-mono);
    color: var(--text-main);
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.8rem 1.5rem;
    margin-right: 1rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
    background: rgba(255,255,255,0.02);
}

    .term-link:hover {
        border-color: var(--cyan-glow);
        color: var(--cyan-glow);
        box-shadow: 0 0 15px rgba(0, 243, 255, 0.2);
    }

    .term-link.primary {
        border-color: var(--cyan-glow);
        color: var(--cyan-glow);
    }

/* =========================================
   5. HOME PAGE ELEMENTS
   ========================================= */
.system-id-section {
    background: #050505;
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-top: 1px dashed rgba(255, 255, 255, 0.1);
    padding: 6rem 5%;
    margin: 4rem 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.large-system-id {
    width: 250px;
    height: 250px;
    margin-bottom: 3rem;
    background-image: url('../billennium_logo.png');
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    -webkit-mask-image: url('../billennium_logo.png');
    mask-image: url('../billennium_logo.png');
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-position: center;
    mask-position: center;
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    background: linear-gradient(135deg, var(--cyan-glow), var(--violet-glow));
    animation: systemPulse 6s ease-in-out infinite;
}

@keyframes systemPulse {
    0%, 100% {
        box-shadow: 0 0 10px rgba(0, 243, 255, 0.1);
    }

    50% {
        box-shadow: 0 0 40px rgba(189, 0, 255, 0.3);
    }
}

.system-id-concept-text {
    max-width: 700px;
    color: var(--text-muted);
    font-size: 1.1rem;
    line-height: 1.8;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.card {
    background: var(--bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 2.5rem 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

    .card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 2px;
        background: transparent;
        transition: background 0.3s ease;
    }

    .card:hover::before {
        background: linear-gradient(90deg, var(--cyan-glow), var(--violet-glow));
    }

    .card:hover {
        transform: translateY(-5px);
        border-color: rgba(255, 255, 255, 0.1);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    }

    .card h3 {
        font-family: var(--font-mono);
        font-size: 1.1rem;
        margin-bottom: 1rem;
        color: #fff;
    }

    .card p {
        color: var(--text-muted);
        font-size: 0.95rem;
        margin-bottom: 2rem;
    }

.card-link {
    font-family: var(--font-mono);
    color: var(--violet-glow);
    text-decoration: none;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 5px;
}

    .card-link:hover {
        text-decoration: underline;
    }

.advantage {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 4rem;
    margin-bottom: 4rem;
}

    .advantage h2 {
        font-size: 2rem;
        font-weight: 300;
        margin-bottom: 1rem;
    }

/* =========================================
   6. CAPABILITIES PAGE
   ========================================= */
.doc-header {
    font-family: var(--font-mono);
    color: var(--cyan-glow);
    font-size: 1.2rem;
    margin-bottom: 1rem;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.doc-section {
    background: var(--bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-left: 2px solid var(--text-muted);
    padding: 3rem;
    margin-bottom: 3rem;
    transition: all 0.3s ease;
}

    .doc-section:hover {
        border-left-color: var(--cyan-glow);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    }

    .doc-section p {
        color: var(--text-main);
        font-size: 1.05rem;
        margin-bottom: 2rem;
        max-width: 800px;
    }

.doc-list {
    list-style: none;
    padding-left: 0;
}

    .doc-list li {
        position: relative;
        padding-left: 1.5rem;
        margin-bottom: 1rem;
        color: var(--text-muted);
    }

        .doc-list li::before {
            content: '>';
            position: absolute;
            left: 0;
            color: var(--violet-glow);
            font-family: var(--font-mono);
            font-weight: bold;
        }

    .doc-list strong {
        color: var(--text-main);
        font-family: var(--font-mono);
        font-size: 0.95rem;
    }

.end-of-file {
    font-family: var(--font-mono);
    color: var(--text-muted);
    text-align: center;
    margin-top: 4rem;
    letter-spacing: 2px;
}

/* =========================================
   7. ARCHITECT PAGE
   ========================================= */
.architect-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 4rem;
    margin-bottom: 4rem;
    align-items: start;
}

.bio-text p {
    color: var(--text-main);
    font-size: 1.05rem;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

    .bio-text p.highlight {
        color: var(--text-muted);
        font-family: var(--font-mono);
        border-left: 2px solid var(--violet-glow);
        padding-left: 1.5rem;
        margin: 2.5rem 0;
    }

.terminal-card {
    background: #050505;
    border: 1px solid var(--cyan-glow);
    padding: 2rem;
    position: relative;
    box-shadow: 0 0 20px rgba(0, 243, 255, 0.05);
}

    .terminal-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 4px;
        background: var(--cyan-glow);
    }

.card-header {
    font-family: var(--font-mono);
    color: var(--cyan-glow);
    font-size: 1.2rem;
    margin-bottom: 2rem;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.2);
    padding-bottom: 1rem;
}

.spec-list {
    list-style: none;
    padding: 0;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

    .spec-list li {
        margin-bottom: 1.2rem;
        display: flex;
        flex-direction: column;
        gap: 4px;
    }

.spec-label {
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 1px;
}

.spec-value {
    color: var(--text-main);
}

/* =========================================
   8. INITIALIZE (CONTACT) PAGE
   ========================================= */
.contact-terminal {
    background: #050505;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-left: 3px solid var(--cyan-glow);
    padding: 3rem;
    max-width: 800px;
    margin: 2rem 0 4rem 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.contact-row {
    margin-bottom: 2rem;
    font-family: var(--font-mono);
}

    .contact-row:last-child {
        margin-bottom: 0;
    }

.contact-label {
    color: var(--text-muted);
    font-size: 0.85rem;
    display: block;
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
}

.contact-data {
    color: var(--text-main);
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 15px;
}

.email-link {
    color: var(--cyan-glow);
    text-decoration: none;
    position: relative;
    padding-bottom: 2px;
    transition: all 0.3s ease;
}

    .email-link::after {
        content: '';
        position: absolute;
        width: 100%;
        transform: scaleX(0);
        height: 1px;
        bottom: 0;
        left: 0;
        background-color: var(--cyan-glow);
        transform-origin: bottom right;
        transition: transform 0.25s ease-out;
    }

    .email-link:hover::after {
        transform: scaleX(1);
        transform-origin: bottom left;
    }

    .email-link:hover {
        text-shadow: 0 0 10px rgba(0, 243, 255, 0.5);
    }

/* =========================================
   9. FOOTER
   ========================================= */
footer {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 3rem 5%;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* =========================================
   10. RESPONSIVE & MOBILE MENU (CSS-ONLY)
   ========================================= */
.menu-btn {
    display: none;
}

.menu-icon {
    display: none;
    cursor: pointer;
    padding: 1.5rem;
    user-select: none;
}

    .menu-icon .navicon {
        background: var(--text-main);
        display: block;
        height: 2px;
        position: relative;
        width: 24px;
        transition: background 0.2s ease-out;
    }

        .menu-icon .navicon:before,
        .menu-icon .navicon:after {
            background: var(--text-main);
            content: '';
            display: block;
            height: 100%;
            position: absolute;
            transition: all 0.2s ease-out;
            width: 100%;
        }

        .menu-icon .navicon:before {
            top: -8px;
        }

        .menu-icon .navicon:after {
            top: 8px;
        }

@media (max-width: 850px) {
    nav {
        flex-wrap: wrap;
        padding: 1rem 5%;
    }

    .menu-icon {
        display: block;
        margin-left: auto;
    }

    .logo {
        font-size: 1rem;
    }

    .nav-links {
        width: 100%;
        flex-direction: column;
        gap: 0;
        overflow: hidden;
        max-height: 0;
        transition: max-height 0.4s ease-out;
        background: rgba(10, 10, 10, 0.98);
        border-top: 1px solid rgba(255, 255, 255, 0.05);
        margin-top: 1rem;
    }

        .nav-links li {
            width: 100%;
        }

            .nav-links li a {
                display: block;
                padding: 1.5rem 5%;
                border-bottom: 1px solid rgba(255, 255, 255, 0.05);
                font-size: 1rem;
            }

    .menu-btn:checked ~ .nav-links {
        max-height: 400px;
    }

    .menu-btn:checked ~ .menu-icon .navicon {
        background: transparent;
    }

        .menu-btn:checked ~ .menu-icon .navicon:before {
            transform: rotate(-45deg);
            top: 0;
            background: var(--cyan-glow);
        }

        .menu-btn:checked ~ .menu-icon .navicon:after {
            transform: rotate(45deg);
            top: 0;
            background: var(--violet-glow);
        }

    .main-heading {
        font-size: 2.8rem;
    }

    .hero {
        padding: 4rem 0;
    }

        .cta-container, .hero div {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

    .term-link {
        width: 100%;
        text-align: center;
        margin-right: 0;
    }

    .large-system-id {
        width: 180px;
        height: 180px;
    }

    .system-id-section {
        padding: 4rem 5%;
    }

    .doc-section {
        padding: 2rem 1.5rem;
    }

    .architect-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .contact-terminal {
        padding: 2rem 1.5rem;
    }

    footer {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}