@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400&display=swap');

:root {
    /* RobOS System Palette */
    --os-bg: #010409;
    --os-accent: #10b981;
    /* Emerald Green */
    --os-accent-dim: rgba(16, 185, 129, 0.15);
    --os-glow: rgba(16, 185, 129, 0.4);
    --os-text: #e6edf3;
    --os-muted: #848d97;

    --glass-surface: rgba(255, 255, 255, 0.02);
    --glass-border: rgba(16, 185, 129, 0.15);

    --font-main: 'Outfit', sans-serif;
    --font-code: 'JetBrains Mono', monospace;

    --ease-expo: cubic-bezier(0.19, 1, 0.22, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--os-bg);
    font-family: var(--font-main);
    color: var(--os-text);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* --- Terminal Background --- */
.bg-scanline {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    background: linear-gradient(to bottom, transparent 50%, rgba(16, 185, 129, 0.02) 50%);
    background-size: 100% 4px;
    pointer-events: none;
}

.bg-radial {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    background: radial-gradient(circle at 10% 10%, #0d1117 0%, var(--os-bg) 100%);
}

/* --- Unique HUD Navigation --- */
.hud-sidebar {
    position: fixed;
    left: 40px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.hud-item {
    width: 50px;
    height: 50px;
    background: rgba(16, 185, 129, 0.05);
    border: 1px solid var(--glass-border);
    display: flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    color: var(--os-accent);
    font-family: var(--font-code);
    font-weight: 800;
    font-size: 0.8rem;
    transition: all 0.4s var(--ease-expo);
    backdrop-filter: blur(10px);
    position: relative;
}

.hud-item::after {
    content: attr(data-label);
    position: absolute;
    left: 100%;
    margin-left: 20px;
    background: #000;
    border: 1px solid var(--os-accent);
    color: var(--os-accent);
    padding: 4px 12px;
    font-size: 0.7rem;
    opacity: 0;
    pointer-events: none;
    transform: translateX(-10px);
    transition: 0.3s;
    white-space: nowrap;
}

.hud-item:hover {
    background: var(--os-accent);
    color: #000;
    box-shadow: 0 0 20px var(--os-glow);
}

.hud-item:hover::after {
    opacity: 1;
    transform: translateX(0);
}

.hud-status-bar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 12px 40px;
    background: rgba(1, 4, 9, 0.8);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1500;
    font-family: var(--font-code);
    font-size: 0.7rem;
    letter-spacing: 1px;
}

/* --- Hero --- */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding-left: 120px;
    /* Space for sidebar */
}

.system-tag {
    font-family: var(--font-code);
    font-size: 0.75rem;
    color: var(--os-accent);
    border: 1px solid var(--os-accent);
    padding: 4px 12px;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 24px;
    display: inline-block;
}

h1 {
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 900;
    letter-spacing: -4px;
    margin-bottom: 20px;
}

.accent-text {
    color: var(--os-accent);
    text-shadow: 0 0 30px var(--os-glow);
}

/* --- Content Modules --- */
.container {
    width: 85%;
    max-width: 1100px;
    margin: 0 auto;
    padding-left: 100px;
    /* Offset for sidebar */
}

.spec-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    margin-bottom: 120px;
}

.spec-card {
    background: rgba(16, 185, 129, 0.02);
    border: 1px solid var(--glass-border);
    padding: 40px;
    border-radius: 2px;
    transition: 0.4s var(--ease-expo);
    position: relative;
}

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

.spec-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--os-accent);
    transition: 0.4s;
}

.spec-card:hover::before {
    width: 100%;
}

.spec-card h3 {
    font-family: var(--font-code);
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--os-accent);
}

.spec-card p {
    color: var(--os-muted);
    font-size: 0.95rem;
}

/* --- Reveal --- */
.reveal {
    opacity: 0;
    transform: translateX(20px);
    transition: 1s var(--ease-expo);
}

.reveal.visible {
    opacity: 1;
    transform: translateX(0);
}

footer {
    padding: 100px 0;
    text-align: center;
    border-top: 1px solid var(--glass-border);
    color: var(--os-muted);
    font-size: 0.75rem;
    font-family: var(--font-code);
    padding-left: 100px;
}