/* Hero Section Dark/Light Background */
.hero-bg {
    background: linear-gradient(rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.9)), url('../images/banner_abstract.png');
    background-size: cover;
    background-position: center;
    transition: background 0.4s;
}

@media (prefers-color-scheme: dark) {
    .hero-bg {
        background: linear-gradient(rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.95)), url('../images/banner_abstract.png');
    }
}

@media (prefers-color-scheme: light) {
    .hero-bg {
        background: linear-gradient(rgba(255,255,255,0.85), rgba(255,255,255,0.85)), url('../images/banner_abstract.png');
    }
}

/* Horizontally moving image animation */
.moving-img {
    animation: move-horizontal 4s ease-in-out infinite alternate;
    display: block;
    max-width: 100%;
}

@keyframes move-horizontal {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(40px);
    }
}
:root {
    /* Color Palette - Light Mode (Default) */
    --primary: #4f46e5;
    /* Indigo */
    --primary-dark: #4338ca;
    --secondary: #ec4899;
    /* Pink */
    --accent: #06b6d4;
    /* Cyan */

    --bg-body: #ffffff;
    --bg-card: #f8fafc;
    --bg-alt: #f1f5f9;

    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);

    --gradient-hero: linear-gradient(135deg, #f0f9ff 0%, #e0e7ff 100%);
    --gradient-text: linear-gradient(to right, var(--primary), var(--secondary));

    --container: 1200px;
    --transition: 0.3s ease;
}

/* Dark Mode Overrides */
[data-theme="dark"] {
    --bg-body: #0f172a;
    --bg-card: #1e293b;
    --bg-alt: #162033;
    /* Slightly lighter than body */

    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3);

    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.7;
    transition: background-color var(--transition), color var(--transition);
}

h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-main);
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.5rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.75rem;
}

p {
    margin-bottom: 1.5rem;
    color: var(--text-muted);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

.text-gradient {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.section-padding {
    padding: 100px 0;
}

.bg-alt {
    background-color: var(--bg-alt);
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.text-center {
    text-align: center;
}

.mx-auto {
    margin-left: auto;
    margin-right: auto;
}

.mb-lg {
    margin-bottom: 3rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.4);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.5);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-main);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* Header */
header {
    background: rgba(var(--bg-body), 0.8);
    /* Requires RGB conv or separate opacity handling, simplified here: */
    background: var(--bg-body);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    padding: 15px 0;
}

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

.logo span {
    font-size: 1.5rem;
    font-weight: 800;
}

.nav-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-muted);
}

.nav-links a:hover {
    color: var(--primary);
}

.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2rem;
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    color: var(--text-main);
    cursor: pointer;
}

/* Hero */
.hero {
    padding-top: 160px;
    padding-bottom: 100px;
    background: var(--gradient-hero);
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero-img img {
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.1));
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-20px);
    }

    100% {
        transform: translateY(0px);
    }
}

/* Features/Services Cards */
.feature-card {
    background: var(--bg-card);
    padding: 40px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    height: 100%;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.icon-box {
    width: 60px;
    height: 60px;
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 25px;
}

/* Stats */
.stat-box h3 {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 5px;
}

.stat-box p {
    font-size: 1.1rem;
    font-weight: 500;
}

/* Footer */
footer {
    background: var(--bg-alt);
    padding-top: 80px;
    border-top: 1px solid var(--border-color);
}

.footer-links a {
    display: block;
    margin-bottom: 12px;
    color: var(--text-muted);
}

.footer-links a:hover {
    color: var(--primary);
    translate: 5px;
}

/* Responsive */
@media (max-width: 900px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .grid-2 {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .mobile-menu-btn {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: var(--bg-body);
        flex-direction: column;
        justify-content: center;
        transition: 0.3s;
        border-right: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
    }

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

/* Animations */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}