/* 
 * Serinc Global - Premium Design System 
 * Theme: Trust & Future (Dark, Corporate, Tech)
 */

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

:root {
    /* Colors */
    --bg-dark: #0f172a;
    /* Slate 900 */
    --bg-card: #1e293b;
    /* Slate 800 */
    --bg-card-hover: #334155;
    /* Slate 700 */

    --text-primary: #f8fafc;
    /* Slate 50 */
    --text-secondary: #94a3b8;
    /* Slate 400 */
    --text-accent: #38bdf8;
    /* Sky 400 */

    --primary-gradient: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
    --surface-gradient: linear-gradient(180deg, rgba(30, 41, 59, 0) 0%, rgba(30, 41, 59, 0.5) 100%);

    --border-color: rgba(148, 163, 184, 0.1);

    /* Spacing */
    --container-padding: 2rem;
    --max-width: 1280px;

    /* Animations */
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

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

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

h1 {
    font-size: 3.5rem;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

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

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

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(6, 182, 212, 0.4);
}

.btn-outline {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.3);
}

.section-padding {
    padding: 6rem 0;
}

/* Header / Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    color: white;
}

.logo span {
    color: var(--text-accent);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-link {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

/* Footer */
.footer {
    background: #0b1120;
    padding: 5rem 0 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-brand p {
    margin-top: 1rem;
    max-width: 300px;
}

.footer-links h4 {
    font-size: 1.1rem;
    color: white;
    margin-bottom: 1.5rem;
}

.footer-links ul li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: var(--text-accent);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 968px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .nav-toggle {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 72px;
        /* Navbar height approximate */
        left: 0;
        width: 100%;
        height: calc(100vh - 72px);
        background: var(--bg-dark);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        transform: translateX(100%);
        transition: transform 0.3s ease-in-out;
    }

    .nav-links.active {
        transform: translateX(0);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 0 1.5rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
}

/* Components */

/* Hero Section */
.hero {
    position: relative;
    padding: 10rem 0 6rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(15, 23, 42, 1) 0%, rgba(15, 23, 42, 0.7) 100%),
        url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?q=80&w=2072&auto=format&fit=crop');
    background-size: cover;
    background-position: center;
    z-index: 0;
    opacity: 0.6;
}

/* Image Utilities */
.img-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-img-top {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
}

.hero h1 {
    margin-bottom: 1.5rem;
}

.hero-stats {
    display: flex;
    gap: 3rem;
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.stat-item strong {
    display: block;
    font-size: 2rem;
    color: white;
    font-weight: 700;
}

.stat-item span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Services Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    border-radius: 16px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card:hover {
    transform: translateY(-5px);
    border-color: rgba(56, 189, 248, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.service-icon {
    width: 50px;
    height: 50px;
    background: rgba(14, 165, 233, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-accent);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.service-card h3 {
    font-size: 1.25rem;
}

.service-card a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    color: var(--text-accent);
    font-weight: 500;
}

.service-card a:hover {
    gap: 0.75rem;
}

/* News Section */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.news-card {
    background: var(--bg-card);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.news-card:hover {
    border-color: var(--text-accent);
}

.news-content {
    padding: 1.5rem;
}

.news-date {
    font-size: 0.85rem;
    color: var(--text-accent);
    margin-bottom: 0.5rem;
    display: block;
}

.news-card h3 {
    font-size: 1.15rem;
    margin-bottom: 1rem;
    line-height: 1.4;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 1rem;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: white;
    font-family: inherit;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--text-accent);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

/* About Page Specifics */
.about-hero {
    text-align: center;
    padding: 8rem 0 4rem;
}

.about-hero h1 {
    max-width: 800px;
    margin: 0 auto 1.5rem;
}

/* Contact Page Specifics */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    align-items: start;
}

.contact-info-card {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

.contact-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.contact-item:last-child {
    margin-bottom: 0;
}

.contact-icon {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-accent);
}