/* Body */
body, html {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', sans-serif;
    background: #f0f4ff;
    color: #333;
    scroll-behavior: smooth;
}

/* Navbar */
header {
    width: 100%;
    background: linear-gradient(90deg, #4a90e2, #007bff);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.navbar-container {
    max-width: 1200px;
    margin: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img { height: 40px; }
.logo span { font-size: 24px; font-weight: 700; color: white; }

nav a {
    margin-left: 25px;
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

nav a:hover { color: #ffe600; }

.btn-login {
    margin-left: 25px;
    padding: 10px 20px;
    border: none;
    border-radius: 12px;
    background: white;
    color: #007bff;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-login:hover { background: #f0f0f0; transform: translateY(-2px); }

/* Upload section */
.section-upload {
    padding: 100px 20px;
    text-align: center;
}

.section-upload h1 { font-size: 42px; margin-bottom: 10px; }
.section-upload p { font-size: 18px; margin-bottom: 30px; color: #555; }

/* Upload card */
.upload-container {
    margin: auto;
    max-width: 520px;
    background: white;
    border: 2px dashed #ccc;
    border-radius: 18px;
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.3s ease;
}

.upload-container.dragover { border-color: #007bff; background: #e6f0ff; }

.upload-container p { margin-bottom: 20px; color: #666; }
.upload-container button {
    padding: 12px 28px;
    margin: 10px 5px 0 5px;
    border: none;
    border-radius: 10px;
    background: #007bff;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-container button:hover { background: #0056b3; transform: translateY(-2px); }

/* Link box */
.link-box {
    max-width: 520px;
    background: #e6f9ff;
    border: 1px solid #00bfff;
    padding: 20px;
    margin-bottom: 25px;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.link-box input { padding: 10px; border-radius: 8px; border: 1px solid #ccc; }

/* Download card */
.download-section { display: flex; justify-content: center; align-items: center; min-height: 80vh; padding: 50px 20px; }
.file-card {
    display: flex;
    max-width: 700px;
    width: 100%;
    background: white;
    border-radius: 25px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.12);
    overflow: hidden;
    transition: all 0.3s ease;
}
.file-card:hover { transform: translateY(-5px); box-shadow: 0 20px 50px rgba(0,0,0,0.18); }
.file-icon { background: #007bff; display: flex; justify-content: center; align-items: center; width: 150px; }
.file-icon img { width: 70px; filter: invert(1); }
.file-info { padding: 30px 40px; display: flex; flex-direction: column; gap: 15px; }
.file-info h2 { margin: 0; font-size: 28px; color: #007bff; font-weight: 700; }
.file-meta { font-size: 14px; color: #666; }
.file-actions { display: flex; flex-wrap: wrap; gap: 15px; align-items: center; }
.btn-download, .btn-copy {
    padding: 12px 25px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    text-decoration: none;
    color: white;
    transition: all 0.3s ease;
}
.btn-download { background: linear-gradient(135deg,#4a90e2,#007bff); }
.btn-download:hover { background: linear-gradient(135deg,#0056b3,#004085); transform: translateY(-2px); }
.btn-copy { background: #28a745; }
.btn-copy:hover { background: #1e7e34; transform: translateY(-2px); }
.copy-link { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.copy-link input { padding: 10px 15px; border-radius: 8px; border: 1px solid #ccc; width: 200px; }
.file-note { font-size: 14px; color: #666; }
.error-panel { max-width: 400px; background: #ffe6e6; border: 1px solid #ff4d4d; padding: 30px 25px; border-radius: 15px; text-align: center; box-shadow: 0 6px 18px rgba(0,0,0,0.05);}
.error-panel h2 { color: #cc0000; margin-bottom: 10px; }
.error-panel p { color: #555; }

/* Hero upload */
.hero-upload {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 120px 20px;
    background: linear-gradient(135deg,#f0f4ff,#e6f0ff);
}

.upload-card {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(15px);
    border-radius: 25px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    padding: 60px 40px;
    max-width: 700px;
    width: 100%;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.upload-card h1 { font-size: 36px; color: #007bff; margin:0;}
.upload-card p { font-size: 16px; color:#555; }

.upload-container { display:flex; flex-direction:column; gap:20px; align-items:center; }
.upload-area {
    display:flex; flex-direction:column; align-items:center; gap:15px;
    padding:40px;
    border:2px dashed #007bff;
    border-radius:20px;
    width:100%;
    transition: all 0.3s ease;
}
.upload-area.dragover { background:#e6f0ff; border-color:#0056b3; }
.upload-icon { width:60px; }
.btn-select, .btn-upload, .btn-copy {
    background:#007bff; color:white; border:none; border-radius:12px; padding:12px 25px; cursor:pointer; font-weight:600; transition: all 0.3s ease;
}
.btn-select:hover, .btn-upload:hover, .btn-copy:hover { background:#0056b3; transform: translateY(-2px); }

/* Steps */
.section-info { padding:80px 20px; text-align:center; max-width:1000px; margin:auto; }
.steps { display:flex; justify-content:space-around; flex-wrap:wrap; gap:30px; margin-top:40px;}
.step { background:white; padding:30px; border-radius:20px; flex:1 1 250px; box-shadow:0 10px 30px rgba(0,0,0,0.08); transition:all 0.3s ease;}
.step:hover { transform:translateY(-5px); box-shadow:0 15px 40px rgba(0,0,0,0.12);}
.step h3 { color:#007bff; margin-bottom:15px;}
.step p { color:#555;}
.step .icon { font-size:40px; margin-bottom:15px; }

/* About & Contact */
.about, .contact { margin-top:60px; font-size:16px; color:#555;}
.contact a { color:#007bff; text-decoration:none;}
.contact a:hover { text-decoration:underline;}