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

body {
    min-height: 100vh;

    font-family: "Segoe UI", sans-serif;

    background:
        linear-gradient(
            135deg,
            #0f172a,
            #1e293b,
            #312e81
        );

    display: flex;
    justify-content: center;
    align-items: center;

    padding: 40px;
}

.container {
    width: 100%;
    max-width: 1100px;
}

.card {
    background: rgba(255,255,255,0.08);

    backdrop-filter: blur(15px);

    border: 1px solid rgba(255,255,255,0.15);

    border-radius: 25px;

    padding: 35px;

    box-shadow:
        0 10px 40px rgba(0,0,0,0.3);
}

h1 {
    color: white;
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.subtitle {
    color: #cbd5e1;
    margin-bottom: 25px;
}

.upload-section {
    display: flex;
    gap: 12px;
    align-items: center;

    margin-bottom: 20px;
}

input[type="file"] {
    flex: 1;

    background: rgba(255,255,255,0.1);

    color: white;

    padding: 12px;

    border-radius: 12px;

    border: 1px solid rgba(255,255,255,0.2);
}

textarea {
    width: 100%;
    min-height: 320px;

    resize: vertical;

    padding: 18px;

    border-radius: 18px;

    border: 1px solid rgba(255,255,255,0.15);

    background: rgba(255,255,255,0.08);

    color: white;

    font-size: 15px;
    line-height: 1.7;

    transition: all 0.3s ease;
}

textarea::placeholder {
    color: #cbd5e1;
}

textarea:focus {
    outline: none;

    border-color: #60a5fa;

    box-shadow:
        0 0 20px rgba(96,165,250,0.35);
}

#wordCount {
    margin-top: 10px;
    color: #cbd5e1;
}

button {
    border: none;

    border-radius: 12px;

    cursor: pointer;

    transition: all 0.3s ease;
}

.upload-section button,
.generate-btn {
    background:
        linear-gradient(
            135deg,
            #3b82f6,
            #6366f1
        );

    color: white;

    padding: 13px 22px;

    font-size: 15px;
    font-weight: 600;
}

.upload-section button:hover,
.generate-btn:hover {
    transform: translateY(-2px);

    box-shadow:
        0 10px 20px rgba(59,130,246,0.4);
}

.generate-btn {
    margin-top: 15px;
    width: 100%;
}

.output-card {
    margin-top: 30px;

    background: rgba(255,255,255,0.08);

    border: 1px solid rgba(255,255,255,0.15);

    border-radius: 20px;

    padding: 25px;
}

.output-card h2 {
    color: white;
    margin-bottom: 15px;
}

.summary-box {
    min-height: 180px;

    background: rgba(0,0,0,0.15);

    border-radius: 14px;

    padding: 18px;

    color: #f8fafc;

    line-height: 1.8;

    white-space: pre-wrap;
}

.summary-box:empty::before {
    content: "Summary will appear here...";
    color: #94a3b8;
}