/* ==========================================================================
   Epplicon Technologies - Main Stylesheet
   Theme Configuration & Global Styles
   ========================================================================== */

/* --- THEME & CONFIGURATION --- */
:root {
    /* Light Mode Colors */
    --primary-color: #0d6efd;
    --secondary-color: #0a192f;
    --background-color: #f5f7fa;
    --surface-color: #ffffff;
    --text-primary: #1e2a3a;
    --text-secondary: #5a6473;
    --border-color: #e9ecef;
    --shadow-sm: 0 4px 15px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.1);
    --transition-fast: all 0.2s ease-in-out;
    --transition-smooth: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    --font-family: 'Poppins', sans-serif;
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --primary-color: #4dabf7;
    --secondary-color: #1a1a2e;
    --background-color: #0f0f1e;
    --surface-color: #16213e;
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --border-color: #27272a;
    --shadow-sm: 0 4px 15px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.5);
}

/* --- GLOBAL STYLES & RESETS --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.8;
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

body.mobile-nav-active {
    overflow: hidden;
}

/* --- LAYOUT --- */
.container {
    width: 90%;
    max-width: 1180px;
    margin: 0 auto;
}

section {
    padding: 100px 0;
    border-bottom: 1px solid var(--border-color);
    overflow: hidden;
}

section:last-of-type {
    border-bottom: none;
}

/* --- TYPOGRAPHY --- */
h1, h2, h3, h4 {
    font-weight: 700;
    color: var(--secondary-color);
    line-height: 1.3;
}

h1 {
    font-size: clamp(2.5rem, 5.5vw, 4.5rem);
    font-weight: 800;
}

h2 {
    font-size: clamp(2rem, 4vw, 3.2rem);
}

h3 {
    font-size: 1.6rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

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

.section-header .subtitle {
    color: var(--primary-color);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

/* --- SKIP TO CONTENT (Accessibility) --- */
.skip-to-content {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--primary-color);
    color: #fff;
    padding: 1rem;
    text-decoration: none;
    z-index: 10000;
    font-weight: 600;
}

.skip-to-content:focus {
    top: 0;
}

/* --- PRELOADER --- */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--secondary-color);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.8s ease, visibility 0.8s ease;
    visibility: visible;
    opacity: 1;
}

#preloader.loaded {
    opacity: 0;
    visibility: hidden;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
    body {
        font-size: 16px;
    }
}