:root {
    --bg-primary: #f8f9fb;
    --bg-secondary: #fff;
    --text-primary: #222;
    --text-secondary: #666;
    --accent-color: #0070f3;
    --accent-hover: #005bb5;
    --border-color: #e0e0e0;
    --shadow: rgba(0,0,0,0.04);
    --card-bg: #fff;
    --nav-bg: #fff;
    --footer-bg: #fff;
    --footer-text: #888;
}

[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --accent-color: #3b82f6;
    --accent-hover: #60a5fa;
    --border-color: #333;
    --shadow: rgba(0,0,0,0.3);
    --card-bg: #1a1a1a;
    --nav-bg: #1a1a1a;
    --footer-bg: #1a1a1a;
    --footer-text: #666;
}

body {
    font-family: 'Inter', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}
a { color: var(--accent-color); text-decoration: none; }
a:hover { text-decoration: underline; }
.navbar {
    background: var(--nav-bg);
    box-shadow: 0 2px 8px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s ease;
}
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
    padding: 1rem 2rem;
}
.nav-logo h2 { 
    margin: 0; 
    font-weight: 700; 
    color: var(--accent-color); 
    transition: all 0.3s ease;
    cursor: pointer;
}

.nav-logo h2:hover {
    transform: scale(1.05);
    text-shadow: 0 2px 8px rgba(0, 112, 243, 0.3);
}
.nav-menu { list-style: none; display: flex; gap: 2rem; margin: 0; }
.nav-link { 
    font-weight: 500; 
    color: var(--text-primary); 
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    position: relative;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover { 
    color: var(--accent-color); 
    background: var(--border-color);
}

.nav-link:hover::before {
    width: 80%;
}
.hamburger { display: none; flex-direction: column; cursor: pointer; }
.hamburger .bar { width: 25px; height: 3px; background: var(--text-primary); margin: 4px 0; border-radius: 2px; transition: background-color 0.3s ease; }
.hero {
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 6rem 0 4rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 60%;
    height: 200%;
    background: linear-gradient(45deg, var(--accent-color) 0%, transparent 70%);
    opacity: 0.05;
    transform: rotate(-15deg);
    z-index: 1;
}

.hero-container {
    position: relative;
    z-index: 2;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}
.hero-title { 
    font-size: 3.5rem; 
    font-weight: 800; 
    margin-bottom: 1.5rem; 
    line-height: 1.2;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle { 
    font-size: 1.4rem; 
    margin-bottom: 3rem; 
    color: var(--text-secondary);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.hero-buttons { 
    display: flex; 
    justify-content: center; 
    gap: 1.5rem; 
    margin-bottom: 4rem;
}

.btn { 
    padding: 1rem 2.5rem; 
    border: none; 
    border-radius: 8px; 
    font-size: 1.1rem; 
    font-weight: 600;
    cursor: pointer; 
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary { 
    background: var(--accent-color); 
    color: #fff; 
    box-shadow: 0 4px 14px rgba(0, 112, 243, 0.3);
}

.btn-primary:hover { 
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 112, 243, 0.4);
}

.btn-secondary { 
    background: transparent; 
    color: var(--accent-color); 
    border: 2px solid var(--accent-color);
}

.btn-secondary:hover { 
    background: var(--accent-color);
    color: #fff;
    transform: translateY(-2px);
}

.hero-stats { 
    display: flex; 
    justify-content: center; 
    gap: 3rem; 
    margin-top: 2rem;
    flex-wrap: wrap;
}

.stat-item { 
    background: var(--card-bg);
    padding: 2rem 2.5rem; 
    border-radius: 12px; 
    box-shadow: 0 4px 20px var(--shadow);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    min-width: 140px;
    position: relative;
    overflow: hidden;
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.stat-item:hover::before {
    left: 100%;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px var(--shadow);
    border-color: var(--accent-color);
}
.stat-item h3 { 
    margin: 0; 
    font-size: 2.5rem; 
    font-weight: 800; 
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.stat-item p {
    margin: 0;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}
.section-title { 
    font-size: 2rem; 
    font-weight: 700; 
    margin-bottom: 2rem; 
    text-align: center;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all 0.3s ease;
}

.section-title:hover {
    transform: scale(1.02);
}
.container { max-width: 1100px; margin: 0 auto; padding: 2rem; }
.expertise-grid, .services-grid { display: flex; gap: 2rem; flex-wrap: wrap; justify-content: center; }
.expertise-card, .service-card {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 20px var(--shadow);
    padding: 2rem;
    flex: 1 1 250px;
    min-width: 250px;
    max-width: 320px;
    margin-bottom: 1rem;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.expertise-card::before, .service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.expertise-card:hover::before, .service-card:hover::before {
    left: 100%;
}

.expertise-card:hover, .service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 30px var(--shadow);
    border-color: var(--accent-color);
}
.expertise-icon, .service-icon { 
    font-size: 2.5rem; 
    color: var(--accent-color); 
    margin-bottom: 1rem; 
    transition: all 0.3s ease;
}

.expertise-card:hover .expertise-icon, 
.service-card:hover .service-icon {
    transform: scale(1.1);
    color: var(--accent-hover);
}
.expertise-card ul { text-align: left; margin: 1rem 0 0 0; padding-left: 1.2rem; }
.timeline { border-left: 3px solid var(--accent-color); margin: 2rem 0; padding-left: 2rem; }
.timeline-item { margin-bottom: 2rem; }
.timeline-content { 
    background: var(--card-bg); 
    border-radius: 12px; 
    padding: 1.5rem; 
    box-shadow: 0 4px 20px var(--shadow); 
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.timeline-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    transition: left 0.5s ease;
}

.timeline-content:hover::before {
    left: 100%;
}

.timeline-content:hover {
    transform: translateX(8px);
    box-shadow: 0 8px 30px var(--shadow);
    border-color: var(--accent-color);
}
.timeline-period { color: var(--accent-color); font-weight: 600; }
.timeline-tags { margin-top: 1rem; }
.tag { 
    display: inline-block; 
    background: #e6f0fa; 
    color: var(--accent-color); 
    border-radius: 6px; 
    padding: 0.3rem 0.8rem; 
    margin-right: 0.5rem; 
    font-size: 0.9rem; 
    font-weight: 500;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.tag:hover {
    background: var(--accent-color);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 112, 243, 0.3);
}
.contact { background: var(--bg-secondary); padding: 3rem 0; transition: background-color 0.3s ease; }
.contact-description { text-align: center; margin-bottom: 2rem; }
.contact-form { max-width: 500px; margin: 0 auto; display: flex; flex-direction: column; gap: 1rem; }
.form-group { display: flex; flex-direction: column; }
label { font-weight: 500; margin-bottom: 0.5rem; }
input, textarea { 
    padding: 0.75rem; 
    border: 1px solid var(--border-color); 
    border-radius: 8px; 
    font-size: 1rem; 
    background: var(--card-bg);
    color: var(--text-primary);
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px var(--shadow);
}

input:focus, textarea:focus { 
    border-color: var(--accent-color); 
    outline: none; 
    transform: translateY(-2px);
    box-shadow: 0 4px 16px var(--shadow);
}
.form-message { text-align: center; margin-top: 1rem; color: var(--accent-color); }
.footer { background: var(--footer-bg); padding: 1.5rem 0; text-align: center; color: var(--footer-text); transition: background-color 0.3s ease, color 0.3s ease; }
.footer-links { margin-top: 0.5rem; }
.footer-links a { 
    color: var(--accent-color); 
    margin: 0 0.5rem; 
    font-size: 1.2rem; 
    transition: all 0.3s ease;
    padding: 0.5rem;
    border-radius: 50%;
    display: inline-block;
}

.footer-links a:hover { 
    color: var(--accent-hover); 
    transform: translateY(-3px) scale(1.1);
    background: var(--border-color);
}

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.3s ease, color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.theme-toggle:hover {
    background: var(--border-color);
}

.theme-toggle i {
    transition: transform 0.3s ease;
}

.theme-toggle:hover i {
    transform: rotate(180deg);
}
@media (max-width: 900px) {
    .expertise-grid, .services-grid { flex-direction: column; align-items: center; }
    .nav-menu { gap: 1rem; }
}
@media (max-width: 600px) {
    .nav-container { flex-direction: column; align-items: flex-start; }
    .nav-menu { flex-direction: column; gap: 0.5rem; width: 100%; }
    .hero-title { font-size: 1.5rem; }
    .hero-stats { flex-direction: column; gap: 1rem; }
    .container { padding: 1rem; }
}