:root {
    /* Dark Theme */
    --bg-color: #0f1113;
    --card-bg: #1a1d21;
    --text-main: #e0e0e0;
    --text-dim: #a0a0a0;
    --accent-green: #2ecc71;
    --nav-bg: rgba(15, 17, 19, 0.9);
    --border: #2d3436;
}

[data-theme="light"] {
    --bg-color: #f5f7f8;
    --card-bg: #ffffff;
    --text-main: #1a1d21;
    --text-dim: #4a4a4a;
    --accent-green: #27ae60;
    --nav-bg: rgba(245, 247, 248, 0.9);
    --border: #dcdde1;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    transition: background 0.3s ease, color 0.3s ease;
    line-height: 1.6;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 10%;
    position: fixed;
    width: 100%;
    top: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
}

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: 2px;
    color: var(--accent-green);
}

.nav-links {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    font-size: 0.9rem;
}

#theme-toggle {
    background: var(--border);
    border: none;
    width: 50px;
    height: 26px;
    border-radius: 20px;
    cursor: pointer;
    position: relative;
}

.mode-icon {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    background: var(--accent-green);
    border-radius: 50%;
    transition: 0.3s;
}

[data-theme="light"] .mode-icon {
    transform: translateX(24px);
}

.hero {
    height: 90vh;
    display: flex;
    align-items: center;
    padding: 0 10%;
    background: linear-gradient(135deg, var(--bg-color) 0%, #142118 100%);
    padding-top: 80px;
}

.hero h1 {
    font-size: 3.5rem;
    max-width: 800px;
    margin-bottom: 20px;
    line-height: 1.2;
}

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

.hero p {
    color: var(--text-dim);
    font-size: 1.2rem;
    max-width: 600px;
    margin-bottom: 30px;
}

.btn-primary {
    display: inline-block;
    padding: 14px 32px;
    background: var(--accent-green);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: opacity 0.3s;
}

.btn-primary:hover {
    opacity: 0.9;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 40px;
    text-align: center;
}

.services,
.case-studies {
    padding: 100px 10%;
}

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

.card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 8px;
    border: 1px solid var(--border);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-green);
}

.card h3 {
    margin-bottom: 15px;
    color: var(--accent-green);
}

.project-card {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.8)), url('https://images.unsplash.com/photo-1473341304170-971dccb5ac1e?auto=format&fit=crop&w=800&q=80');
    background-size: cover;
    height: 350px;
    border-radius: 12px;
    display: flex;
    align-items: flex-end;
    padding: 30px;
    border: 1px solid var(--border);
}

.tag {
    background: var(--accent-green);
    color: white;
    padding: 4px 12px;
    font-size: 0.75rem;
    border-radius: 20px;
    font-weight: 600;
    margin-bottom: 10px;
    display: inline-block;
}

.contact-section {
    padding: 100px 10%;
    background: var(--card-bg);
}

.contact-container {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.input-group {
    margin-bottom: 20px;
    text-align: left;
}

input,
textarea {
    width: 100%;
    padding: 15px;
    background: var(--bg-color);
    border: 1px solid var(--border);
    color: var(--text-main);
    border-radius: 6px;
    font-size: 1rem;
}

.error-msg {
    color: #ff7675;
    font-size: 0.8rem;
    display: none;
    margin-top: 5px;
}

.hidden {
    display: none;
    padding: 20px;
    background: rgba(46, 204, 113, 0.1);
    border-radius: 8px;
}