/* =========================================
   DALKRINS TECHNOLOGIES - GLOBAL STYLES
   ========================================= */

/* --- CSS Variables (Light Theme Default) --- */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f1f5f9;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --accent-color: #0284c7;
    --accent-hover: #0369a1;
    --nav-bg: rgba(255, 255, 255, 0.85);
    --card-border: #e2e8f0;
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

/* --- Dark Theme Overrides --- */
[data-theme="dark"] {
    --bg-primary: #0a0f18;
    --bg-secondary: #111827;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-color: #38bdf8;
    --accent-hover: #7dd3fc;
    --nav-bg: rgba(10, 15, 24, 0.85);
    --card-border: #1e293b;
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

/* --- Base Reset & Typography --- */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-main);
    line-height: 1.6;
    transition: var(--transition);
}
h1, h2, h3, h4, .badge { 
    font-family: 'Montserrat', sans-serif; 
    font-weight: 700; 
}
.brand-text { font-family: 'Montserrat', sans-serif; font-size: 1.5rem; font-weight: 800; color: var(--accent-color); letter-spacing: 0.5px; }
a { text-decoration: none; color: inherit; }
.container { max-width: 1280px; margin: 0 auto; padding: 0 2rem; }

/* --- Navigation --- */
.navbar {
    position: sticky; top: 0; z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--card-border);
    padding: 1rem 0;
    transition: var(--transition);
}
.nav-wrapper { display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 0.8rem; }
.brand img { height: 50px; width: auto; }

.nav-links { display: flex; gap: 2rem; font-weight: 500; }
.nav-links a { position: relative; color: var(--text-muted); transition: var(--transition); }
.nav-links a:hover, .nav-links a.active { color: var(--accent-color); }
.nav-links a::after {
    content: ''; position: absolute; width: 0; height: 2px;
    bottom: -4px; left: 0; background-color: var(--accent-color);
    transition: var(--transition);
}
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.nav-controls { display: flex; align-items: center; gap: 1.5rem; }
.theme-toggle {
    background: none; border: none; font-size: 1.2rem;
    color: var(--text-muted); cursor: pointer; transition: var(--transition);
}
.theme-toggle:hover { color: var(--accent-color); transform: rotate(15deg); }
.btn {
    padding: 0.6rem 1.5rem; border-radius: 8px; font-weight: 600;
    cursor: pointer; transition: var(--transition); border: 2px solid transparent;
    display: inline-flex; align-items: center; gap: 0.5rem;
}
.btn-primary { background: var(--accent-color); color: #fff; border-color: var(--accent-color); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); box-shadow: var(--shadow-md); transform: translateY(-2px); }

/* --- Hero Section --- */
.hero {
    min-height: 85vh; display: flex; align-items: center;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    position: relative; overflow: hidden;
}
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.hero-content { z-index: 2; }
.badge {
    display: inline-block; padding: 0.4rem 1rem; border-radius: 50px;
    background: var(--bg-secondary); border: 1px solid var(--card-border);
    color: var(--accent-color); font-size: 0.85rem; text-transform: uppercase;
    margin-bottom: 1.5rem;
}
.hero-title { font-size: clamp(3rem, 5vw, 4.5rem); line-height: 1.1; margin-bottom: 1.5rem; }
.hero-subtitle { font-size: 1.2rem; color: var(--text-muted); margin-bottom: 2rem; max-width: 500px; }
.hero-actions { display: flex; gap: 1rem; }

/* Abstract Graphic for Hero */
.hero-graphic { position: relative; height: 100%; display: flex; justify-content: center; align-items: center; }
.tech-circle {
    width: 400px; height: 400px; border-radius: 50%;
    border: 2px dashed var(--accent-color);
    animation: spin 30s linear infinite; position: absolute; opacity: 0.2;
}
.tech-circle-inner {
    width: 300px; height: 300px; border-radius: 50%;
    background: radial-gradient(circle, var(--accent-color) 0%, transparent 70%);
    opacity: 0.1; animation: pulse 4s ease-in-out infinite alternate;
}

@keyframes spin { 100% { transform: rotate(360deg); } }
@keyframes pulse { 100% { transform: scale(1.1); opacity: 0.2; } }

/* --- Page Headers (Inner Pages) --- */
.page-header {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    padding: 5rem 0 3rem; text-align: center; border-bottom: 1px solid var(--card-border);
}
.page-title { font-size: 2.8rem; color: var(--accent-color); margin-bottom: 1rem; }
.page-subtitle { font-size: 1.1rem; color: var(--text-muted); max-width: 700px; margin: 0 auto; }

/* --- Grid & Layout Sections --- */
.section { padding: 5rem 0; }
.section-bg { background-color: var(--bg-secondary); }
.section-header { text-align: center; margin-bottom: 3.5rem; }
.section-title { font-size: 2.2rem; color: var(--text-main); margin-bottom: 1rem; }

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.5rem; }

/* --- UI Cards --- */
.card {
    background: var(--bg-primary); border: 1px solid var(--card-border);
    border-radius: 12px; padding: 2rem; transition: var(--transition);
    box-shadow: var(--shadow-sm); height: 100%; display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: var(--accent-color); }
.card-icon {
    width: 60px; height: 60px; border-radius: 12px; background: rgba(2, 132, 199, 0.1);
    color: var(--accent-color); display: flex; align-items: center; justify-content: center;
    font-size: 1.8rem; margin-bottom: 1.5rem;
}
.card-title { font-size: 1.25rem; margin-bottom: 1rem; color: var(--text-main); }
.card-text { color: var(--text-muted); font-size: 0.95rem; flex-grow: 1; }

/* --- Back to Top Button --- */
#backToTop {
    position: fixed; bottom: -50px; right: 30px; z-index: 999;
    background-color: var(--accent-color); color: #fff;
    width: 45px; height: 45px; border-radius: 50%; border: none;
    font-size: 1.2rem; cursor: pointer; box-shadow: var(--shadow-md);
    transition: var(--transition); opacity: 0; visibility: hidden;
}
#backToTop.show { bottom: 30px; opacity: 1; visibility: visible; }
#backToTop:hover { background-color: var(--accent-hover); transform: translateY(-5px); }

/* --- Footer --- */
.footer { border-top: 1px solid var(--card-border); padding: 3rem 0; margin-top: 4rem; }
.footer-wrapper { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 2rem; }
.footer-text { color: var(--text-muted); font-size: 0.95rem; }
.social-links { display: flex; gap: 1rem; }
.social-links a {
    display: flex; justify-content: center; align-items: center;
    width: 40px; height: 40px; border-radius: 50%;
    background: var(--bg-secondary); color: var(--text-muted); transition: var(--transition);
}
.social-links a:hover { background: var(--accent-color); color: #fff; transform: translateY(-3px); }

/* --- Responsive --- */
@media (max-width: 992px) {
    .hero-grid { grid-template-columns: 1fr; text-align: center; }
    .hero-subtitle { margin: 0 auto 2rem; }
    .hero-actions { justify-content: center; }
    .hero-graphic { display: none; }
    .nav-links { display: none; }
}