:root {
    --primary: #8D6E63;
    --primary-dark: #5D4037;
    --secondary: #5D7B8F;
    --accent: #B05E51;
    --bg-light: #FDF8F5;
    --text: #3E2723;
    --text-muted: #6D4C41;
    --white: #ffffff;
    --glass: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.3);
    --shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
    --container-width: 1100px;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-light);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Nav */
header {
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(253, 248, 245, 0.8);
    backdrop-filter: blur(10px);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 40px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--primary);
}

/* Buttons */
.btn-primary {
    background: var(--primary-dark);
    color: var(--white) !important;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: var(--text);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-dark) !important;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
    border: 1px solid rgba(0,0,0,0.1);
}

.btn-secondary:hover {
    background: var(--bg-light);
    transform: translateY(-2px);
}

.lg {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

/* Hero Section */
.hero {
    padding: 8rem 0;
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    align-items: center;
    gap: 4rem;
}

.hero h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
}

.hero h1 .accent {
    color: var(--accent);
    position: relative;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 500px;
}

.hero-btns {
    display: flex;
    gap: 1rem;
}

/* Hero Visual / Preview */
.hero-visual {
    position: relative;
}

.glass-card {
    background: var(--white);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: 2rem;
    transition: transform 0.3s;
}

.main-preview {
    width: 100%;
    max-width: 450px;
    margin: 0 auto;
    position: relative;
    background: linear-gradient(135deg, #ffffff 0%, #f9f4f1 100%);
}

.preview-header {
    display: flex;
    gap: 8px;
    margin-bottom: 1.5rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #e0e0e0;
}

.item-row, .result-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.8rem;
    background: var(--white);
    border-radius: 12px;
    margin-bottom: 0.8rem;
    box-shadow: 0 4px 10px rgba(0,0,0,0.02);
}

.file-icon {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    color: white;
}

.pdf { background: #ff5252; }
.img { background: #4caf50; }
.txt { background: #2196f3; }
.success { background: var(--primary-dark); }

.file-name {
    font-size: 0.9rem;
    font-weight: 500;
}

.merge-arrow {
    text-align: center;
    font-size: 1.5rem;
    color: var(--primary);
    margin: 0.5rem 0;
}

.result-row {
    border: 2px solid var(--primary);
    background: #fff8f6;
}

/* Features */
.features {
    padding: 6rem 0;
    text-align: center;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 4rem;
    color: var(--primary-dark);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 3rem 2rem;
    text-align: left;
    height: 100%;
}

.feature-card .icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--primary-dark);
}

.feature-card p {
    color: var(--text-muted);
}

.feature-card:hover {
    transform: translateY(-10px);
}

/* Footer */
footer {
    padding: 4rem 0;
    border-top: 1px solid rgba(0,0,0,0.05);
}

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

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 900px) {
    .hero {
        grid-template-columns: 1fr;
        padding: 4rem 0;
        text-align: center;
    }
    .hero-content {
        order: 1;
    }
    .hero p {
        margin: 0 auto 2.5rem;
    }
    .hero-btns {
        justify-content: center;
    }
    .hero h1 {
        font-size: 3rem;
    }
}

@media (max-width: 600px) {
    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    z-index: 9999;
    padding-top: 50px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.85);
    backdrop-filter: blur(5px);
    justify-content: center;
    align-items: center;
}

.lightbox-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 90vh;
    border-radius: 12px;
    box-shadow: 0 0 30px rgba(0,0,0,0.6);
    animation: zoom 0.3s ease-out;
}

@keyframes zoom {
    from {transform: scale(0.9); opacity: 0;}
    to {transform: scale(1); opacity: 1;}
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 40px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.lightbox-close:hover,
.lightbox-close:focus {
    color: var(--accent);
    text-decoration: none;
    cursor: pointer;
}