/* 31NS-Tech Redesign Master Stylesheet */
:root {
    /* Brand Colors */
    --primary-bg: #0d1b2a;
    /* Deepest Navy */
    --secondary-bg: #1b263b;
    /* Navy */
    --card-bg: #1c2541;
    /* Slightly lighter for cards */
    --accent-blue: #00b4d8;
    /* Electric Blue */
    --accent-glow: #90e0ef;
    /* Glow effect color */
    --text-main: #e0e1dd;
    /* Off-white */
    --text-muted: #778da9;
    /* Muted Blue-Grey */

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Spacing & Layout */
    --max-width: 1200px;
    --header-height: 80px;
    --border-color: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: var(--font-main);
    background-color: transparent;
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    padding-top: var(--header-height);
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul {
    list-style: none;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ------------------------------------------------------------------
   HEADER & NAVIGATION
------------------------------------------------------------------ */
header {
    background: rgba(13, 27, 42, 0.8);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    height: var(--header-height);
    display: flex;
    align-items: center;
}

nav {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ------------------------------------------------------------------
   BACKGROUNDS
------------------------------------------------------------------ */
.bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-color: var(--primary-bg);
    /* Fallback */
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    filter: brightness(0.7);
    /* Adjusted for visibility */
}

/* Page Specific Backgrounds */
body.page-index .bg {
    background-image: url("bg-index.png");
}

body.page-about .bg {
    background-image: url("bg-about.png");
}

body.page-services .bg {
    background-image: url("bg-services.png");
}

body.page-portfolio .bg {
    background-image: url("bg-portfolio.png");
}

body.page-contact .bg {
    background-image: url("bg-contact.png");
}

/* Logo with Neon Pulse Animation */
.logo a {
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
    /* Adjusted size */
    animation: neonPulse 2.0s ease-in-out infinite alternate;
    border-radius: 4px;
    /* Slight rounded corners if valid */
}

@keyframes neonPulse {
    0% {
        filter: drop-shadow(0 0 2px #00eaff);
        opacity: 0.8;
    }

    50% {
        filter: drop-shadow(0 0 10px #00eaff);
        opacity: 1;
    }

    100% {
        filter: drop-shadow(0 0 4px #00eaff);
        opacity: 0.9;
    }
}

/* Desktop Menu */
.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-weight: 500;
    font-size: 1rem;
    color: var(--text-muted);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--accent-blue);
    transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

/* Hamburger Menu Toggle (Hidden on Desktop) */
.menu-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--text-main);
    cursor: pointer;
}

/* ------------------------------------------------------------------
   SECTIONS & HERO
------------------------------------------------------------------ */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.2rem;
    color: var(--text-main);
    margin-bottom: 10px;
}

.section-title p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* Highlight Text */
.highlight {
    color: var(--accent-blue);
    font-weight: 700;
}

/* Hero Section */
.hero {
    padding: 100px 0;
    text-align: center;
    background: radial-gradient(circle at 50% 30%, rgba(0, 180, 216, 0.15), transparent 50%);
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 40px;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    background: var(--accent-blue);
    color: var(--primary-bg);
    font-weight: 700;
    border-radius: 6px;
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(0, 180, 216, 0.4);
    filter: brightness(1.1);
}

/* ------------------------------------------------------------------
   CARDS & GRID
------------------------------------------------------------------ */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 30px;
    border-radius: 12px;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-blue);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.card-icon {
    font-size: 2.5rem;
    color: var(--accent-blue);
    margin-bottom: 20px;
    display: block;
}

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-main);
}

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

.card ul {
    margin-top: 15px;
    padding-left: 20px;
}

.card ul li {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    list-style: disc;
    /* Revert to disc for clarity inside cards */
}

/* Sub-card style for About/Portfolio pages */
.content-block {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    margin-bottom: 40px;
    border-left: 4px solid var(--accent-blue);
}

.content-block h3 {
    margin-bottom: 15px;
    color: var(--accent-blue);
}

/* ------------------------------------------------------------------
   FOOTER
------------------------------------------------------------------ */
footer {
    background: #050a10;
    padding: 80px 0 40px;
    border-top: 1px solid var(--border-color);
    margin-top: 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr 1.5fr;
    gap: 40px;
    margin-bottom: 60px;
}

.footer-col h4 {
    color: var(--text-main);
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col a {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-col a:hover {
    color: var(--accent-blue);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Table Style for Contact Page */
.keyword-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    font-size: 0.95rem;
}

.keyword-table th,
.keyword-table td {
    padding: 15px;
    border: 1px solid var(--border-color);
    text-align: left;
}

.keyword-table th {
    background-color: var(--secondary-bg);
    color: var(--accent-blue);
    width: 140px;
}

/* ------------------------------------------------------------------
   MOBILE RESPONSIVE
------------------------------------------------------------------ */
@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }

    .menu-toggle {
        display: block;
        z-index: 1001;
        /* Above mobile menu */
    }

    /* Full screen mobile menu */
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        /* Hidden by default */
        width: 75%;
        height: 100vh;
        background: var(--secondary-bg);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right 0.3s ease;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.5);
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links a {
        font-size: 1.2rem;
        margin: 15px 0;
    }

    /* Grid Stacking */
    .grid-3 {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    section {
        padding: 60px 0;
    }
}